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cpython/Lib/test/_test_multiprocessing.py

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#
# Unit tests for the multiprocessing package
#
import unittest
import unittest.mock
import queue as pyqueue
import textwrap
import time
import io
import itertools
import sys
import os
import gc
import errno
import signal
import array
import socket
import random
import logging
import subprocess
import struct
import operator
import pathlib
import pickle
import weakref
import warnings
import test.support
import test.support.script_helper
from test import support
from test.support import hashlib_helper
from test.support import import_helper
from test.support import os_helper
from test.support import socket_helper
from test.support import threading_helper
from test.support import warnings_helper
# Skip tests if _multiprocessing wasn't built.
_multiprocessing = import_helper.import_module('_multiprocessing')
# Skip tests if sem_open implementation is broken.
support.skip_if_broken_multiprocessing_synchronize()
import threading
import multiprocessing.connection
import multiprocessing.dummy
import multiprocessing.heap
import multiprocessing.managers
import multiprocessing.pool
import multiprocessing.queues
from multiprocessing import util
try:
from multiprocessing import reduction
HAS_REDUCTION = reduction.HAVE_SEND_HANDLE
except ImportError:
HAS_REDUCTION = False
try:
from multiprocessing.sharedctypes import Value, copy
HAS_SHAREDCTYPES = True
except ImportError:
HAS_SHAREDCTYPES = False
try:
from multiprocessing import shared_memory
HAS_SHMEM = True
except ImportError:
HAS_SHMEM = False
try:
import msvcrt
except ImportError:
msvcrt = None
if support.check_sanitizer(address=True):
# bpo-45200: Skip multiprocessing tests if Python is built with ASAN to
# work around a libasan race condition: dead lock in pthread_create().
raise unittest.SkipTest("libasan has a pthread_create() dead lock")
def latin(s):
return s.encode('latin')
def close_queue(queue):
if isinstance(queue, multiprocessing.queues.Queue):
queue.close()
queue.join_thread()
def join_process(process):
# Since multiprocessing.Process has the same API than threading.Thread
# (join() and is_alive(), the support function can be reused
threading_helper.join_thread(process)
if os.name == "posix":
from multiprocessing import resource_tracker
def _resource_unlink(name, rtype):
resource_tracker._CLEANUP_FUNCS[rtype](name)
#
# Constants
#
LOG_LEVEL = util.SUBWARNING
#LOG_LEVEL = logging.DEBUG
DELTA = 0.1
CHECK_TIMINGS = False # making true makes tests take a lot longer
# and can sometimes cause some non-serious
# failures because some calls block a bit
# longer than expected
if CHECK_TIMINGS:
TIMEOUT1, TIMEOUT2, TIMEOUT3 = 0.82, 0.35, 1.4
else:
TIMEOUT1, TIMEOUT2, TIMEOUT3 = 0.1, 0.1, 0.1
# BaseManager.shutdown_timeout
SHUTDOWN_TIMEOUT = support.SHORT_TIMEOUT
WAIT_ACTIVE_CHILDREN_TIMEOUT = 5.0
HAVE_GETVALUE = not getattr(_multiprocessing,
'HAVE_BROKEN_SEM_GETVALUE', False)
WIN32 = (sys.platform == "win32")
from multiprocessing.connection import wait
def wait_for_handle(handle, timeout):
if timeout is not None and timeout < 0.0:
timeout = None
return wait([handle], timeout)
try:
MAXFD = os.sysconf("SC_OPEN_MAX")
except:
MAXFD = 256
# To speed up tests when using the forkserver, we can preload these:
PRELOAD = ['__main__', 'test.test_multiprocessing_forkserver']
#
# Some tests require ctypes
#
try:
from ctypes import Structure, c_int, c_double, c_longlong
except ImportError:
Structure = object
c_int = c_double = c_longlong = None
def check_enough_semaphores():
"""Check that the system supports enough semaphores to run the test."""
# minimum number of semaphores available according to POSIX
nsems_min = 256
try:
nsems = os.sysconf("SC_SEM_NSEMS_MAX")
except (AttributeError, ValueError):
# sysconf not available or setting not available
return
if nsems == -1 or nsems >= nsems_min:
return
raise unittest.SkipTest("The OS doesn't support enough semaphores "
"to run the test (required: %d)." % nsems_min)
#
# Creates a wrapper for a function which records the time it takes to finish
#
class TimingWrapper(object):
def __init__(self, func):
self.func = func
self.elapsed = None
def __call__(self, *args, **kwds):
t = time.monotonic()
try:
return self.func(*args, **kwds)
finally:
self.elapsed = time.monotonic() - t
#
# Base class for test cases
#
class BaseTestCase(object):
ALLOWED_TYPES = ('processes', 'manager', 'threads')
def assertTimingAlmostEqual(self, a, b):
if CHECK_TIMINGS:
self.assertAlmostEqual(a, b, 1)
def assertReturnsIfImplemented(self, value, func, *args):
try:
res = func(*args)
except NotImplementedError:
pass
else:
return self.assertEqual(value, res)
# For the sanity of Windows users, rather than crashing or freezing in
# multiple ways.
def __reduce__(self, *args):
raise NotImplementedError("shouldn't try to pickle a test case")
__reduce_ex__ = __reduce__
#
# Return the value of a semaphore
#
def get_value(self):
try:
return self.get_value()
except AttributeError:
try:
return self._Semaphore__value
except AttributeError:
try:
return self._value
except AttributeError:
raise NotImplementedError
#
# Testcases
#
class DummyCallable:
def __call__(self, q, c):
assert isinstance(c, DummyCallable)
q.put(5)
class _TestProcess(BaseTestCase):
ALLOWED_TYPES = ('processes', 'threads')
def test_current(self):
if self.TYPE == 'threads':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
current = self.current_process()
authkey = current.authkey
self.assertTrue(current.is_alive())
self.assertTrue(not current.daemon)
self.assertIsInstance(authkey, bytes)
self.assertTrue(len(authkey) > 0)
self.assertEqual(current.ident, os.getpid())
self.assertEqual(current.exitcode, None)
def test_set_executable(self):
if self.TYPE == 'threads':
self.skipTest(f'test not appropriate for {self.TYPE}')
paths = [
sys.executable, # str
sys.executable.encode(), # bytes
pathlib.Path(sys.executable) # os.PathLike
]
for path in paths:
self.set_executable(path)
p = self.Process()
p.start()
p.join()
self.assertEqual(p.exitcode, 0)
def test_args_argument(self):
# bpo-45735: Using list or tuple as *args* in constructor could
# achieve the same effect.
args_cases = (1, "str", [1], (1,))
args_types = (list, tuple)
test_cases = itertools.product(args_cases, args_types)
for args, args_type in test_cases:
with self.subTest(args=args, args_type=args_type):
q = self.Queue(1)
# pass a tuple or list as args
p = self.Process(target=self._test_args, args=args_type((q, args)))
p.daemon = True
p.start()
child_args = q.get()
self.assertEqual(child_args, args)
p.join()
close_queue(q)
@classmethod
def _test_args(cls, q, arg):
q.put(arg)
def test_daemon_argument(self):
if self.TYPE == "threads":
self.skipTest('test not appropriate for {}'.format(self.TYPE))
# By default uses the current process's daemon flag.
proc0 = self.Process(target=self._test)
self.assertEqual(proc0.daemon, self.current_process().daemon)
proc1 = self.Process(target=self._test, daemon=True)
self.assertTrue(proc1.daemon)
proc2 = self.Process(target=self._test, daemon=False)
self.assertFalse(proc2.daemon)
@classmethod
def _test(cls, q, *args, **kwds):
current = cls.current_process()
q.put(args)
q.put(kwds)
q.put(current.name)
if cls.TYPE != 'threads':
q.put(bytes(current.authkey))
q.put(current.pid)
def test_parent_process_attributes(self):
if self.TYPE == "threads":
self.skipTest('test not appropriate for {}'.format(self.TYPE))
self.assertIsNone(self.parent_process())
rconn, wconn = self.Pipe(duplex=False)
p = self.Process(target=self._test_send_parent_process, args=(wconn,))
p.start()
p.join()
parent_pid, parent_name = rconn.recv()
self.assertEqual(parent_pid, self.current_process().pid)
self.assertEqual(parent_pid, os.getpid())
self.assertEqual(parent_name, self.current_process().name)
@classmethod
def _test_send_parent_process(cls, wconn):
from multiprocessing.process import parent_process
wconn.send([parent_process().pid, parent_process().name])
def test_parent_process(self):
if self.TYPE == "threads":
self.skipTest('test not appropriate for {}'.format(self.TYPE))
# Launch a child process. Make it launch a grandchild process. Kill the
# child process and make sure that the grandchild notices the death of
# its parent (a.k.a the child process).
rconn, wconn = self.Pipe(duplex=False)
p = self.Process(
target=self._test_create_grandchild_process, args=(wconn, ))
p.start()
if not rconn.poll(timeout=support.LONG_TIMEOUT):
raise AssertionError("Could not communicate with child process")
parent_process_status = rconn.recv()
self.assertEqual(parent_process_status, "alive")
p.terminate()
p.join()
if not rconn.poll(timeout=support.LONG_TIMEOUT):
raise AssertionError("Could not communicate with child process")
parent_process_status = rconn.recv()
self.assertEqual(parent_process_status, "not alive")
@classmethod
def _test_create_grandchild_process(cls, wconn):
p = cls.Process(target=cls._test_report_parent_status, args=(wconn, ))
p.start()
time.sleep(300)
@classmethod
def _test_report_parent_status(cls, wconn):
from multiprocessing.process import parent_process
wconn.send("alive" if parent_process().is_alive() else "not alive")
parent_process().join(timeout=support.SHORT_TIMEOUT)
wconn.send("alive" if parent_process().is_alive() else "not alive")
def test_process(self):
q = self.Queue(1)
e = self.Event()
args = (q, 1, 2)
kwargs = {'hello':23, 'bye':2.54}
name = 'SomeProcess'
p = self.Process(
target=self._test, args=args, kwargs=kwargs, name=name
)
p.daemon = True
current = self.current_process()
if self.TYPE != 'threads':
self.assertEqual(p.authkey, current.authkey)
self.assertEqual(p.is_alive(), False)
self.assertEqual(p.daemon, True)
self.assertNotIn(p, self.active_children())
self.assertTrue(type(self.active_children()) is list)
self.assertEqual(p.exitcode, None)
p.start()
self.assertEqual(p.exitcode, None)
self.assertEqual(p.is_alive(), True)
self.assertIn(p, self.active_children())
self.assertEqual(q.get(), args[1:])
self.assertEqual(q.get(), kwargs)
self.assertEqual(q.get(), p.name)
if self.TYPE != 'threads':
self.assertEqual(q.get(), current.authkey)
self.assertEqual(q.get(), p.pid)
p.join()
self.assertEqual(p.exitcode, 0)
self.assertEqual(p.is_alive(), False)
self.assertNotIn(p, self.active_children())
close_queue(q)
@unittest.skipUnless(threading._HAVE_THREAD_NATIVE_ID, "needs native_id")
def test_process_mainthread_native_id(self):
if self.TYPE == 'threads':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
current_mainthread_native_id = threading.main_thread().native_id
q = self.Queue(1)
p = self.Process(target=self._test_process_mainthread_native_id, args=(q,))
p.start()
child_mainthread_native_id = q.get()
p.join()
close_queue(q)
self.assertNotEqual(current_mainthread_native_id, child_mainthread_native_id)
@classmethod
def _test_process_mainthread_native_id(cls, q):
mainthread_native_id = threading.main_thread().native_id
q.put(mainthread_native_id)
@classmethod
def _sleep_some(cls):
time.sleep(100)
@classmethod
def _test_sleep(cls, delay):
time.sleep(delay)
def _kill_process(self, meth):
if self.TYPE == 'threads':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
p = self.Process(target=self._sleep_some)
p.daemon = True
p.start()
self.assertEqual(p.is_alive(), True)
self.assertIn(p, self.active_children())
self.assertEqual(p.exitcode, None)
join = TimingWrapper(p.join)
self.assertEqual(join(0), None)
self.assertTimingAlmostEqual(join.elapsed, 0.0)
self.assertEqual(p.is_alive(), True)
self.assertEqual(join(-1), None)
self.assertTimingAlmostEqual(join.elapsed, 0.0)
self.assertEqual(p.is_alive(), True)
# XXX maybe terminating too soon causes the problems on Gentoo...
time.sleep(1)
meth(p)
if hasattr(signal, 'alarm'):
# On the Gentoo buildbot waitpid() often seems to block forever.
# We use alarm() to interrupt it if it blocks for too long.
def handler(*args):
raise RuntimeError('join took too long: %s' % p)
old_handler = signal.signal(signal.SIGALRM, handler)
try:
signal.alarm(10)
self.assertEqual(join(), None)
finally:
signal.alarm(0)
signal.signal(signal.SIGALRM, old_handler)
else:
self.assertEqual(join(), None)
self.assertTimingAlmostEqual(join.elapsed, 0.0)
self.assertEqual(p.is_alive(), False)
self.assertNotIn(p, self.active_children())
p.join()
return p.exitcode
def test_terminate(self):
exitcode = self._kill_process(multiprocessing.Process.terminate)
if os.name != 'nt':
self.assertEqual(exitcode, -signal.SIGTERM)
def test_kill(self):
exitcode = self._kill_process(multiprocessing.Process.kill)
if os.name != 'nt':
self.assertEqual(exitcode, -signal.SIGKILL)
def test_cpu_count(self):
try:
cpus = multiprocessing.cpu_count()
except NotImplementedError:
cpus = 1
self.assertTrue(type(cpus) is int)
self.assertTrue(cpus >= 1)
def test_active_children(self):
self.assertEqual(type(self.active_children()), list)
p = self.Process(target=time.sleep, args=(DELTA,))
self.assertNotIn(p, self.active_children())
p.daemon = True
p.start()
self.assertIn(p, self.active_children())
p.join()
self.assertNotIn(p, self.active_children())
@classmethod
def _test_recursion(cls, wconn, id):
wconn.send(id)
if len(id) < 2:
for i in range(2):
p = cls.Process(
target=cls._test_recursion, args=(wconn, id+[i])
)
p.start()
p.join()
def test_recursion(self):
rconn, wconn = self.Pipe(duplex=False)
self._test_recursion(wconn, [])
time.sleep(DELTA)
result = []
while rconn.poll():
result.append(rconn.recv())
expected = [
[],
[0],
[0, 0],
[0, 1],
[1],
[1, 0],
[1, 1]
]
self.assertEqual(result, expected)
@classmethod
def _test_sentinel(cls, event):
event.wait(10.0)
def test_sentinel(self):
if self.TYPE == "threads":
self.skipTest('test not appropriate for {}'.format(self.TYPE))
event = self.Event()
p = self.Process(target=self._test_sentinel, args=(event,))
with self.assertRaises(ValueError):
p.sentinel
p.start()
self.addCleanup(p.join)
sentinel = p.sentinel
self.assertIsInstance(sentinel, int)
self.assertFalse(wait_for_handle(sentinel, timeout=0.0))
event.set()
p.join()
self.assertTrue(wait_for_handle(sentinel, timeout=1))
@classmethod
def _test_close(cls, rc=0, q=None):
if q is not None:
q.get()
sys.exit(rc)
def test_close(self):
if self.TYPE == "threads":
self.skipTest('test not appropriate for {}'.format(self.TYPE))
q = self.Queue()
p = self.Process(target=self._test_close, kwargs={'q': q})
p.daemon = True
p.start()
self.assertEqual(p.is_alive(), True)
# Child is still alive, cannot close
with self.assertRaises(ValueError):
p.close()
q.put(None)
p.join()
self.assertEqual(p.is_alive(), False)
self.assertEqual(p.exitcode, 0)
p.close()
with self.assertRaises(ValueError):
p.is_alive()
with self.assertRaises(ValueError):
p.join()
with self.assertRaises(ValueError):
p.terminate()
p.close()
wr = weakref.ref(p)
del p
gc.collect()
self.assertIs(wr(), None)
close_queue(q)
def test_many_processes(self):
if self.TYPE == 'threads':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
sm = multiprocessing.get_start_method()
N = 5 if sm == 'spawn' else 100
# Try to overwhelm the forkserver loop with events
procs = [self.Process(target=self._test_sleep, args=(0.01,))
for i in range(N)]
for p in procs:
p.start()
for p in procs:
join_process(p)
for p in procs:
self.assertEqual(p.exitcode, 0)
procs = [self.Process(target=self._sleep_some)
for i in range(N)]
for p in procs:
p.start()
time.sleep(0.001) # let the children start...
for p in procs:
p.terminate()
for p in procs:
join_process(p)
if os.name != 'nt':
exitcodes = [-signal.SIGTERM]
if sys.platform == 'darwin':
# bpo-31510: On macOS, killing a freshly started process with
# SIGTERM sometimes kills the process with SIGKILL.
exitcodes.append(-signal.SIGKILL)
for p in procs:
self.assertIn(p.exitcode, exitcodes)
def test_lose_target_ref(self):
c = DummyCallable()
wr = weakref.ref(c)
q = self.Queue()
p = self.Process(target=c, args=(q, c))
del c
p.start()
p.join()
gc.collect() # For PyPy or other GCs.
self.assertIs(wr(), None)
self.assertEqual(q.get(), 5)
close_queue(q)
@classmethod
def _test_child_fd_inflation(self, evt, q):
q.put(os_helper.fd_count())
evt.wait()
def test_child_fd_inflation(self):
# Number of fds in child processes should not grow with the
# number of running children.
if self.TYPE == 'threads':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
sm = multiprocessing.get_start_method()
if sm == 'fork':
# The fork method by design inherits all fds from the parent,
# trying to go against it is a lost battle
self.skipTest('test not appropriate for {}'.format(sm))
N = 5
evt = self.Event()
q = self.Queue()
procs = [self.Process(target=self._test_child_fd_inflation, args=(evt, q))
for i in range(N)]
for p in procs:
p.start()
try:
fd_counts = [q.get() for i in range(N)]
self.assertEqual(len(set(fd_counts)), 1, fd_counts)
finally:
evt.set()
for p in procs:
p.join()
close_queue(q)
@classmethod
def _test_wait_for_threads(self, evt):
def func1():
time.sleep(0.5)
evt.set()
def func2():
time.sleep(20)
evt.clear()
threading.Thread(target=func1).start()
threading.Thread(target=func2, daemon=True).start()
def test_wait_for_threads(self):
# A child process should wait for non-daemonic threads to end
# before exiting
if self.TYPE == 'threads':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
evt = self.Event()
proc = self.Process(target=self._test_wait_for_threads, args=(evt,))
proc.start()
proc.join()
self.assertTrue(evt.is_set())
@classmethod
def _test_error_on_stdio_flush(self, evt, break_std_streams={}):
for stream_name, action in break_std_streams.items():
if action == 'close':
stream = io.StringIO()
stream.close()
else:
assert action == 'remove'
stream = None
setattr(sys, stream_name, None)
evt.set()
def test_error_on_stdio_flush_1(self):
# Check that Process works with broken standard streams
streams = [io.StringIO(), None]
streams[0].close()
for stream_name in ('stdout', 'stderr'):
for stream in streams:
old_stream = getattr(sys, stream_name)
setattr(sys, stream_name, stream)
try:
evt = self.Event()
proc = self.Process(target=self._test_error_on_stdio_flush,
args=(evt,))
proc.start()
proc.join()
self.assertTrue(evt.is_set())
self.assertEqual(proc.exitcode, 0)
finally:
setattr(sys, stream_name, old_stream)
def test_error_on_stdio_flush_2(self):
# Same as test_error_on_stdio_flush_1(), but standard streams are
# broken by the child process
for stream_name in ('stdout', 'stderr'):
for action in ('close', 'remove'):
old_stream = getattr(sys, stream_name)
try:
evt = self.Event()
proc = self.Process(target=self._test_error_on_stdio_flush,
args=(evt, {stream_name: action}))
proc.start()
proc.join()
self.assertTrue(evt.is_set())
self.assertEqual(proc.exitcode, 0)
finally:
setattr(sys, stream_name, old_stream)
@classmethod
def _sleep_and_set_event(self, evt, delay=0.0):
time.sleep(delay)
evt.set()
def check_forkserver_death(self, signum):
# bpo-31308: if the forkserver process has died, we should still
# be able to create and run new Process instances (the forkserver
# is implicitly restarted).
if self.TYPE == 'threads':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
sm = multiprocessing.get_start_method()
if sm != 'forkserver':
# The fork method by design inherits all fds from the parent,
# trying to go against it is a lost battle
self.skipTest('test not appropriate for {}'.format(sm))
from multiprocessing.forkserver import _forkserver
_forkserver.ensure_running()
# First process sleeps 500 ms
delay = 0.5
evt = self.Event()
proc = self.Process(target=self._sleep_and_set_event, args=(evt, delay))
proc.start()
pid = _forkserver._forkserver_pid
os.kill(pid, signum)
# give time to the fork server to die and time to proc to complete
time.sleep(delay * 2.0)
evt2 = self.Event()
proc2 = self.Process(target=self._sleep_and_set_event, args=(evt2,))
proc2.start()
proc2.join()
self.assertTrue(evt2.is_set())
self.assertEqual(proc2.exitcode, 0)
proc.join()
self.assertTrue(evt.is_set())
self.assertIn(proc.exitcode, (0, 255))
def test_forkserver_sigint(self):
# Catchable signal
self.check_forkserver_death(signal.SIGINT)
def test_forkserver_sigkill(self):
# Uncatchable signal
if os.name != 'nt':
self.check_forkserver_death(signal.SIGKILL)
#
#
#
class _UpperCaser(multiprocessing.Process):
def __init__(self):
multiprocessing.Process.__init__(self)
self.child_conn, self.parent_conn = multiprocessing.Pipe()
def run(self):
self.parent_conn.close()
for s in iter(self.child_conn.recv, None):
self.child_conn.send(s.upper())
self.child_conn.close()
def submit(self, s):
assert type(s) is str
self.parent_conn.send(s)
return self.parent_conn.recv()
def stop(self):
self.parent_conn.send(None)
self.parent_conn.close()
self.child_conn.close()
class _TestSubclassingProcess(BaseTestCase):
ALLOWED_TYPES = ('processes',)
def test_subclassing(self):
uppercaser = _UpperCaser()
uppercaser.daemon = True
uppercaser.start()
self.assertEqual(uppercaser.submit('hello'), 'HELLO')
self.assertEqual(uppercaser.submit('world'), 'WORLD')
uppercaser.stop()
uppercaser.join()
def test_stderr_flush(self):
# sys.stderr is flushed at process shutdown (issue #13812)
if self.TYPE == "threads":
self.skipTest('test not appropriate for {}'.format(self.TYPE))
testfn = os_helper.TESTFN
self.addCleanup(os_helper.unlink, testfn)
proc = self.Process(target=self._test_stderr_flush, args=(testfn,))
proc.start()
proc.join()
with open(testfn, encoding="utf-8") as f:
err = f.read()
# The whole traceback was printed
self.assertIn("ZeroDivisionError", err)
self.assertIn("test_multiprocessing.py", err)
self.assertIn("1/0 # MARKER", err)
@classmethod
def _test_stderr_flush(cls, testfn):
fd = os.open(testfn, os.O_WRONLY | os.O_CREAT | os.O_EXCL)
sys.stderr = open(fd, 'w', encoding="utf-8", closefd=False)
1/0 # MARKER
@classmethod
def _test_sys_exit(cls, reason, testfn):
fd = os.open(testfn, os.O_WRONLY | os.O_CREAT | os.O_EXCL)
sys.stderr = open(fd, 'w', encoding="utf-8", closefd=False)
sys.exit(reason)
def test_sys_exit(self):
# See Issue 13854
if self.TYPE == 'threads':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
testfn = os_helper.TESTFN
self.addCleanup(os_helper.unlink, testfn)
for reason in (
[1, 2, 3],
'ignore this',
):
p = self.Process(target=self._test_sys_exit, args=(reason, testfn))
p.daemon = True
p.start()
join_process(p)
self.assertEqual(p.exitcode, 1)
with open(testfn, encoding="utf-8") as f:
content = f.read()
self.assertEqual(content.rstrip(), str(reason))
os.unlink(testfn)
cases = [
((True,), 1),
((False,), 0),
((8,), 8),
((None,), 0),
((), 0),
]
for args, expected in cases:
with self.subTest(args=args):
p = self.Process(target=sys.exit, args=args)
p.daemon = True
p.start()
join_process(p)
self.assertEqual(p.exitcode, expected)
#
#
#
def queue_empty(q):
if hasattr(q, 'empty'):
return q.empty()
else:
return q.qsize() == 0
def queue_full(q, maxsize):
if hasattr(q, 'full'):
return q.full()
else:
return q.qsize() == maxsize
class _TestQueue(BaseTestCase):
@classmethod
def _test_put(cls, queue, child_can_start, parent_can_continue):
child_can_start.wait()
for i in range(6):
queue.get()
parent_can_continue.set()
def test_put(self):
MAXSIZE = 6
queue = self.Queue(maxsize=MAXSIZE)
child_can_start = self.Event()
parent_can_continue = self.Event()
proc = self.Process(
target=self._test_put,
args=(queue, child_can_start, parent_can_continue)
)
proc.daemon = True
proc.start()
self.assertEqual(queue_empty(queue), True)
self.assertEqual(queue_full(queue, MAXSIZE), False)
queue.put(1)
queue.put(2, True)
queue.put(3, True, None)
queue.put(4, False)
queue.put(5, False, None)
queue.put_nowait(6)
# the values may be in buffer but not yet in pipe so sleep a bit
time.sleep(DELTA)
self.assertEqual(queue_empty(queue), False)
self.assertEqual(queue_full(queue, MAXSIZE), True)
put = TimingWrapper(queue.put)
put_nowait = TimingWrapper(queue.put_nowait)
self.assertRaises(pyqueue.Full, put, 7, False)
self.assertTimingAlmostEqual(put.elapsed, 0)
self.assertRaises(pyqueue.Full, put, 7, False, None)
self.assertTimingAlmostEqual(put.elapsed, 0)
self.assertRaises(pyqueue.Full, put_nowait, 7)
self.assertTimingAlmostEqual(put_nowait.elapsed, 0)
self.assertRaises(pyqueue.Full, put, 7, True, TIMEOUT1)
self.assertTimingAlmostEqual(put.elapsed, TIMEOUT1)
self.assertRaises(pyqueue.Full, put, 7, False, TIMEOUT2)
self.assertTimingAlmostEqual(put.elapsed, 0)
self.assertRaises(pyqueue.Full, put, 7, True, timeout=TIMEOUT3)
self.assertTimingAlmostEqual(put.elapsed, TIMEOUT3)
child_can_start.set()
parent_can_continue.wait()
self.assertEqual(queue_empty(queue), True)
self.assertEqual(queue_full(queue, MAXSIZE), False)
proc.join()
close_queue(queue)
@classmethod
def _test_get(cls, queue, child_can_start, parent_can_continue):
child_can_start.wait()
#queue.put(1)
queue.put(2)
queue.put(3)
queue.put(4)
queue.put(5)
parent_can_continue.set()
def test_get(self):
queue = self.Queue()
child_can_start = self.Event()
parent_can_continue = self.Event()
proc = self.Process(
target=self._test_get,
args=(queue, child_can_start, parent_can_continue)
)
proc.daemon = True
proc.start()
self.assertEqual(queue_empty(queue), True)
child_can_start.set()
parent_can_continue.wait()
time.sleep(DELTA)
self.assertEqual(queue_empty(queue), False)
# Hangs unexpectedly, remove for now
#self.assertEqual(queue.get(), 1)
self.assertEqual(queue.get(True, None), 2)
self.assertEqual(queue.get(True), 3)
self.assertEqual(queue.get(timeout=1), 4)
self.assertEqual(queue.get_nowait(), 5)
self.assertEqual(queue_empty(queue), True)
get = TimingWrapper(queue.get)
get_nowait = TimingWrapper(queue.get_nowait)
self.assertRaises(pyqueue.Empty, get, False)
self.assertTimingAlmostEqual(get.elapsed, 0)
self.assertRaises(pyqueue.Empty, get, False, None)
self.assertTimingAlmostEqual(get.elapsed, 0)
self.assertRaises(pyqueue.Empty, get_nowait)
self.assertTimingAlmostEqual(get_nowait.elapsed, 0)
self.assertRaises(pyqueue.Empty, get, True, TIMEOUT1)
self.assertTimingAlmostEqual(get.elapsed, TIMEOUT1)
self.assertRaises(pyqueue.Empty, get, False, TIMEOUT2)
self.assertTimingAlmostEqual(get.elapsed, 0)
self.assertRaises(pyqueue.Empty, get, timeout=TIMEOUT3)
self.assertTimingAlmostEqual(get.elapsed, TIMEOUT3)
proc.join()
close_queue(queue)
@classmethod
def _test_fork(cls, queue):
for i in range(10, 20):
queue.put(i)
# note that at this point the items may only be buffered, so the
# process cannot shutdown until the feeder thread has finished
# pushing items onto the pipe.
def test_fork(self):
# Old versions of Queue would fail to create a new feeder
# thread for a forked process if the original process had its
# own feeder thread. This test checks that this no longer
# happens.
queue = self.Queue()
# put items on queue so that main process starts a feeder thread
for i in range(10):
queue.put(i)
# wait to make sure thread starts before we fork a new process
time.sleep(DELTA)
# fork process
p = self.Process(target=self._test_fork, args=(queue,))
p.daemon = True
p.start()
# check that all expected items are in the queue
for i in range(20):
self.assertEqual(queue.get(), i)
self.assertRaises(pyqueue.Empty, queue.get, False)
p.join()
close_queue(queue)
def test_qsize(self):
q = self.Queue()
try:
self.assertEqual(q.qsize(), 0)
except NotImplementedError:
self.skipTest('qsize method not implemented')
q.put(1)
self.assertEqual(q.qsize(), 1)
q.put(5)
self.assertEqual(q.qsize(), 2)
q.get()
self.assertEqual(q.qsize(), 1)
q.get()
self.assertEqual(q.qsize(), 0)
close_queue(q)
@classmethod
def _test_task_done(cls, q):
for obj in iter(q.get, None):
time.sleep(DELTA)
q.task_done()
def test_task_done(self):
queue = self.JoinableQueue()
workers = [self.Process(target=self._test_task_done, args=(queue,))
for i in range(4)]
for p in workers:
p.daemon = True
p.start()
for i in range(10):
queue.put(i)
queue.join()
for p in workers:
queue.put(None)
for p in workers:
p.join()
close_queue(queue)
def test_no_import_lock_contention(self):
with os_helper.temp_cwd():
module_name = 'imported_by_an_imported_module'
with open(module_name + '.py', 'w', encoding="utf-8") as f:
f.write("""if 1:
import multiprocessing
q = multiprocessing.Queue()
q.put('knock knock')
q.get(timeout=3)
q.close()
del q
""")
with import_helper.DirsOnSysPath(os.getcwd()):
try:
__import__(module_name)
except pyqueue.Empty:
self.fail("Probable regression on import lock contention;"
" see Issue #22853")
def test_timeout(self):
q = multiprocessing.Queue()
start = time.monotonic()
self.assertRaises(pyqueue.Empty, q.get, True, 0.200)
delta = time.monotonic() - start
# bpo-30317: Tolerate a delta of 100 ms because of the bad clock
# resolution on Windows (usually 15.6 ms). x86 Windows7 3.x once
# failed because the delta was only 135.8 ms.
self.assertGreaterEqual(delta, 0.100)
close_queue(q)
def test_queue_feeder_donot_stop_onexc(self):
# bpo-30414: verify feeder handles exceptions correctly
if self.TYPE != 'processes':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
class NotSerializable(object):
def __reduce__(self):
raise AttributeError
with test.support.captured_stderr():
q = self.Queue()
q.put(NotSerializable())
q.put(True)
self.assertTrue(q.get(timeout=support.SHORT_TIMEOUT))
close_queue(q)
with test.support.captured_stderr():
# bpo-33078: verify that the queue size is correctly handled
# on errors.
q = self.Queue(maxsize=1)
q.put(NotSerializable())
q.put(True)
try:
self.assertEqual(q.qsize(), 1)
except NotImplementedError:
# qsize is not available on all platform as it
# relies on sem_getvalue
pass
self.assertTrue(q.get(timeout=support.SHORT_TIMEOUT))
# Check that the size of the queue is correct
self.assertTrue(q.empty())
close_queue(q)
def test_queue_feeder_on_queue_feeder_error(self):
# bpo-30006: verify feeder handles exceptions using the
# _on_queue_feeder_error hook.
if self.TYPE != 'processes':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
class NotSerializable(object):
"""Mock unserializable object"""
def __init__(self):
self.reduce_was_called = False
self.on_queue_feeder_error_was_called = False
def __reduce__(self):
self.reduce_was_called = True
raise AttributeError
class SafeQueue(multiprocessing.queues.Queue):
"""Queue with overloaded _on_queue_feeder_error hook"""
@staticmethod
def _on_queue_feeder_error(e, obj):
if (isinstance(e, AttributeError) and
isinstance(obj, NotSerializable)):
obj.on_queue_feeder_error_was_called = True
not_serializable_obj = NotSerializable()
# The captured_stderr reduces the noise in the test report
with test.support.captured_stderr():
q = SafeQueue(ctx=multiprocessing.get_context())
q.put(not_serializable_obj)
# Verify that q is still functioning correctly
q.put(True)
self.assertTrue(q.get(timeout=support.SHORT_TIMEOUT))
# Assert that the serialization and the hook have been called correctly
self.assertTrue(not_serializable_obj.reduce_was_called)
self.assertTrue(not_serializable_obj.on_queue_feeder_error_was_called)
def test_closed_queue_put_get_exceptions(self):
for q in multiprocessing.Queue(), multiprocessing.JoinableQueue():
q.close()
with self.assertRaisesRegex(ValueError, 'is closed'):
q.put('foo')
with self.assertRaisesRegex(ValueError, 'is closed'):
q.get()
#
#
#
class _TestLock(BaseTestCase):
def test_lock(self):
lock = self.Lock()
self.assertEqual(lock.acquire(), True)
self.assertEqual(lock.acquire(False), False)
self.assertEqual(lock.release(), None)
self.assertRaises((ValueError, threading.ThreadError), lock.release)
def test_rlock(self):
lock = self.RLock()
self.assertEqual(lock.acquire(), True)
self.assertEqual(lock.acquire(), True)
self.assertEqual(lock.acquire(), True)
self.assertEqual(lock.release(), None)
self.assertEqual(lock.release(), None)
self.assertEqual(lock.release(), None)
self.assertRaises((AssertionError, RuntimeError), lock.release)
def test_lock_context(self):
with self.Lock():
pass
class _TestSemaphore(BaseTestCase):
def _test_semaphore(self, sem):
self.assertReturnsIfImplemented(2, get_value, sem)
self.assertEqual(sem.acquire(), True)
self.assertReturnsIfImplemented(1, get_value, sem)
self.assertEqual(sem.acquire(), True)
self.assertReturnsIfImplemented(0, get_value, sem)
self.assertEqual(sem.acquire(False), False)
self.assertReturnsIfImplemented(0, get_value, sem)
self.assertEqual(sem.release(), None)
self.assertReturnsIfImplemented(1, get_value, sem)
self.assertEqual(sem.release(), None)
self.assertReturnsIfImplemented(2, get_value, sem)
def test_semaphore(self):
sem = self.Semaphore(2)
self._test_semaphore(sem)
self.assertEqual(sem.release(), None)
self.assertReturnsIfImplemented(3, get_value, sem)
self.assertEqual(sem.release(), None)
self.assertReturnsIfImplemented(4, get_value, sem)
def test_bounded_semaphore(self):
sem = self.BoundedSemaphore(2)
self._test_semaphore(sem)
# Currently fails on OS/X
#if HAVE_GETVALUE:
# self.assertRaises(ValueError, sem.release)
# self.assertReturnsIfImplemented(2, get_value, sem)
def test_timeout(self):
if self.TYPE != 'processes':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
sem = self.Semaphore(0)
acquire = TimingWrapper(sem.acquire)
self.assertEqual(acquire(False), False)
self.assertTimingAlmostEqual(acquire.elapsed, 0.0)
self.assertEqual(acquire(False, None), False)
self.assertTimingAlmostEqual(acquire.elapsed, 0.0)
self.assertEqual(acquire(False, TIMEOUT1), False)
self.assertTimingAlmostEqual(acquire.elapsed, 0)
self.assertEqual(acquire(True, TIMEOUT2), False)
self.assertTimingAlmostEqual(acquire.elapsed, TIMEOUT2)
self.assertEqual(acquire(timeout=TIMEOUT3), False)
self.assertTimingAlmostEqual(acquire.elapsed, TIMEOUT3)
class _TestCondition(BaseTestCase):
@classmethod
def f(cls, cond, sleeping, woken, timeout=None):
cond.acquire()
sleeping.release()
cond.wait(timeout)
woken.release()
cond.release()
def assertReachesEventually(self, func, value):
for i in range(10):
try:
if func() == value:
break
except NotImplementedError:
break
time.sleep(DELTA)
time.sleep(DELTA)
self.assertReturnsIfImplemented(value, func)
def check_invariant(self, cond):
# this is only supposed to succeed when there are no sleepers
if self.TYPE == 'processes':
try:
sleepers = (cond._sleeping_count.get_value() -
cond._woken_count.get_value())
self.assertEqual(sleepers, 0)
self.assertEqual(cond._wait_semaphore.get_value(), 0)
except NotImplementedError:
pass
def test_notify(self):
cond = self.Condition()
sleeping = self.Semaphore(0)
woken = self.Semaphore(0)
p = self.Process(target=self.f, args=(cond, sleeping, woken))
p.daemon = True
p.start()
self.addCleanup(p.join)
p = threading.Thread(target=self.f, args=(cond, sleeping, woken))
p.daemon = True
p.start()
self.addCleanup(p.join)
# wait for both children to start sleeping
sleeping.acquire()
sleeping.acquire()
# check no process/thread has woken up
time.sleep(DELTA)
self.assertReturnsIfImplemented(0, get_value, woken)
# wake up one process/thread
cond.acquire()
cond.notify()
cond.release()
# check one process/thread has woken up
time.sleep(DELTA)
self.assertReturnsIfImplemented(1, get_value, woken)
# wake up another
cond.acquire()
cond.notify()
cond.release()
# check other has woken up
time.sleep(DELTA)
self.assertReturnsIfImplemented(2, get_value, woken)
# check state is not mucked up
self.check_invariant(cond)
p.join()
def test_notify_all(self):
cond = self.Condition()
sleeping = self.Semaphore(0)
woken = self.Semaphore(0)
# start some threads/processes which will timeout
for i in range(3):
p = self.Process(target=self.f,
args=(cond, sleeping, woken, TIMEOUT1))
p.daemon = True
p.start()
self.addCleanup(p.join)
t = threading.Thread(target=self.f,
args=(cond, sleeping, woken, TIMEOUT1))
t.daemon = True
t.start()
self.addCleanup(t.join)
# wait for them all to sleep
for i in range(6):
sleeping.acquire()
# check they have all timed out
for i in range(6):
woken.acquire()
self.assertReturnsIfImplemented(0, get_value, woken)
# check state is not mucked up
self.check_invariant(cond)
# start some more threads/processes
for i in range(3):
p = self.Process(target=self.f, args=(cond, sleeping, woken))
p.daemon = True
p.start()
self.addCleanup(p.join)
t = threading.Thread(target=self.f, args=(cond, sleeping, woken))
t.daemon = True
t.start()
self.addCleanup(t.join)
# wait for them to all sleep
for i in range(6):
sleeping.acquire()
# check no process/thread has woken up
time.sleep(DELTA)
self.assertReturnsIfImplemented(0, get_value, woken)
# wake them all up
cond.acquire()
cond.notify_all()
cond.release()
# check they have all woken
self.assertReachesEventually(lambda: get_value(woken), 6)
# check state is not mucked up
self.check_invariant(cond)
def test_notify_n(self):
cond = self.Condition()
sleeping = self.Semaphore(0)
woken = self.Semaphore(0)
# start some threads/processes
for i in range(3):
p = self.Process(target=self.f, args=(cond, sleeping, woken))
p.daemon = True
p.start()
self.addCleanup(p.join)
t = threading.Thread(target=self.f, args=(cond, sleeping, woken))
t.daemon = True
t.start()
self.addCleanup(t.join)
# wait for them to all sleep
for i in range(6):
sleeping.acquire()
# check no process/thread has woken up
time.sleep(DELTA)
self.assertReturnsIfImplemented(0, get_value, woken)
# wake some of them up
cond.acquire()
cond.notify(n=2)
cond.release()
# check 2 have woken
self.assertReachesEventually(lambda: get_value(woken), 2)
# wake the rest of them
cond.acquire()
cond.notify(n=4)
cond.release()
self.assertReachesEventually(lambda: get_value(woken), 6)
# doesn't do anything more
cond.acquire()
cond.notify(n=3)
cond.release()
self.assertReturnsIfImplemented(6, get_value, woken)
# check state is not mucked up
self.check_invariant(cond)
def test_timeout(self):
cond = self.Condition()
wait = TimingWrapper(cond.wait)
cond.acquire()
res = wait(TIMEOUT1)
cond.release()
self.assertEqual(res, False)
self.assertTimingAlmostEqual(wait.elapsed, TIMEOUT1)
@classmethod
def _test_waitfor_f(cls, cond, state):
with cond:
state.value = 0
cond.notify()
result = cond.wait_for(lambda : state.value==4)
if not result or state.value != 4:
sys.exit(1)
@unittest.skipUnless(HAS_SHAREDCTYPES, 'needs sharedctypes')
def test_waitfor(self):
# based on test in test/lock_tests.py
cond = self.Condition()
state = self.Value('i', -1)
p = self.Process(target=self._test_waitfor_f, args=(cond, state))
p.daemon = True
p.start()
with cond:
result = cond.wait_for(lambda : state.value==0)
self.assertTrue(result)
self.assertEqual(state.value, 0)
for i in range(4):
time.sleep(0.01)
with cond:
state.value += 1
cond.notify()
join_process(p)
self.assertEqual(p.exitcode, 0)
@classmethod
def _test_waitfor_timeout_f(cls, cond, state, success, sem):
sem.release()
with cond:
expected = 0.1
dt = time.monotonic()
result = cond.wait_for(lambda : state.value==4, timeout=expected)
dt = time.monotonic() - dt
# borrow logic in assertTimeout() from test/lock_tests.py
if not result and expected * 0.6 < dt < expected * 10.0:
success.value = True
@unittest.skipUnless(HAS_SHAREDCTYPES, 'needs sharedctypes')
def test_waitfor_timeout(self):
# based on test in test/lock_tests.py
cond = self.Condition()
state = self.Value('i', 0)
success = self.Value('i', False)
sem = self.Semaphore(0)
p = self.Process(target=self._test_waitfor_timeout_f,
args=(cond, state, success, sem))
p.daemon = True
p.start()
self.assertTrue(sem.acquire(timeout=support.LONG_TIMEOUT))
# Only increment 3 times, so state == 4 is never reached.
for i in range(3):
time.sleep(0.01)
with cond:
state.value += 1
cond.notify()
join_process(p)
self.assertTrue(success.value)
@classmethod
def _test_wait_result(cls, c, pid):
with c:
c.notify()
time.sleep(1)
if pid is not None:
os.kill(pid, signal.SIGINT)
def test_wait_result(self):
if isinstance(self, ProcessesMixin) and sys.platform != 'win32':
pid = os.getpid()
else:
pid = None
c = self.Condition()
with c:
self.assertFalse(c.wait(0))
self.assertFalse(c.wait(0.1))
p = self.Process(target=self._test_wait_result, args=(c, pid))
p.start()
self.assertTrue(c.wait(60))
if pid is not None:
self.assertRaises(KeyboardInterrupt, c.wait, 60)
p.join()
class _TestEvent(BaseTestCase):
@classmethod
def _test_event(cls, event):
time.sleep(TIMEOUT2)
event.set()
def test_event(self):
event = self.Event()
wait = TimingWrapper(event.wait)
# Removed temporarily, due to API shear, this does not
# work with threading._Event objects. is_set == isSet
self.assertEqual(event.is_set(), False)
# Removed, threading.Event.wait() will return the value of the __flag
# instead of None. API Shear with the semaphore backed mp.Event
self.assertEqual(wait(0.0), False)
self.assertTimingAlmostEqual(wait.elapsed, 0.0)
self.assertEqual(wait(TIMEOUT1), False)
self.assertTimingAlmostEqual(wait.elapsed, TIMEOUT1)
event.set()
# See note above on the API differences
self.assertEqual(event.is_set(), True)
self.assertEqual(wait(), True)
self.assertTimingAlmostEqual(wait.elapsed, 0.0)
self.assertEqual(wait(TIMEOUT1), True)
self.assertTimingAlmostEqual(wait.elapsed, 0.0)
# self.assertEqual(event.is_set(), True)
event.clear()
#self.assertEqual(event.is_set(), False)
p = self.Process(target=self._test_event, args=(event,))
p.daemon = True
p.start()
self.assertEqual(wait(), True)
p.join()
def test_repr(self) -> None:
event = self.Event()
if self.TYPE == 'processes':
self.assertRegex(repr(event), r"<Event at .* unset>")
event.set()
self.assertRegex(repr(event), r"<Event at .* set>")
event.clear()
self.assertRegex(repr(event), r"<Event at .* unset>")
elif self.TYPE == 'manager':
self.assertRegex(repr(event), r"<EventProxy object, typeid 'Event' at .*")
event.set()
self.assertRegex(repr(event), r"<EventProxy object, typeid 'Event' at .*")
# Tests for Barrier - adapted from tests in test/lock_tests.py
#
# Many of the tests for threading.Barrier use a list as an atomic
# counter: a value is appended to increment the counter, and the
# length of the list gives the value. We use the class DummyList
# for the same purpose.
class _DummyList(object):
def __init__(self):
wrapper = multiprocessing.heap.BufferWrapper(struct.calcsize('i'))
lock = multiprocessing.Lock()
self.__setstate__((wrapper, lock))
self._lengthbuf[0] = 0
def __setstate__(self, state):
(self._wrapper, self._lock) = state
self._lengthbuf = self._wrapper.create_memoryview().cast('i')
def __getstate__(self):
return (self._wrapper, self._lock)
def append(self, _):
with self._lock:
self._lengthbuf[0] += 1
def __len__(self):
with self._lock:
return self._lengthbuf[0]
def _wait():
# A crude wait/yield function not relying on synchronization primitives.
time.sleep(0.01)
class Bunch(object):
"""
A bunch of threads.
"""
def __init__(self, namespace, f, args, n, wait_before_exit=False):
"""
Construct a bunch of `n` threads running the same function `f`.
If `wait_before_exit` is True, the threads won't terminate until
do_finish() is called.
"""
self.f = f
self.args = args
self.n = n
self.started = namespace.DummyList()
self.finished = namespace.DummyList()
self._can_exit = namespace.Event()
if not wait_before_exit:
self._can_exit.set()
threads = []
for i in range(n):
p = namespace.Process(target=self.task)
p.daemon = True
p.start()
threads.append(p)
def finalize(threads):
for p in threads:
p.join()
self._finalizer = weakref.finalize(self, finalize, threads)
def task(self):
pid = os.getpid()
self.started.append(pid)
try:
self.f(*self.args)
finally:
self.finished.append(pid)
self._can_exit.wait(30)
assert self._can_exit.is_set()
def wait_for_started(self):
while len(self.started) < self.n:
_wait()
def wait_for_finished(self):
while len(self.finished) < self.n:
_wait()
def do_finish(self):
self._can_exit.set()
def close(self):
self._finalizer()
class AppendTrue(object):
def __init__(self, obj):
self.obj = obj
def __call__(self):
self.obj.append(True)
class _TestBarrier(BaseTestCase):
"""
Tests for Barrier objects.
"""
N = 5
defaultTimeout = 30.0 # XXX Slow Windows buildbots need generous timeout
def setUp(self):
self.barrier = self.Barrier(self.N, timeout=self.defaultTimeout)
def tearDown(self):
self.barrier.abort()
self.barrier = None
def DummyList(self):
if self.TYPE == 'threads':
return []
elif self.TYPE == 'manager':
return self.manager.list()
else:
return _DummyList()
def run_threads(self, f, args):
b = Bunch(self, f, args, self.N-1)
try:
f(*args)
b.wait_for_finished()
finally:
b.close()
@classmethod
def multipass(cls, barrier, results, n):
m = barrier.parties
assert m == cls.N
for i in range(n):
results[0].append(True)
assert len(results[1]) == i * m
barrier.wait()
results[1].append(True)
assert len(results[0]) == (i + 1) * m
barrier.wait()
try:
assert barrier.n_waiting == 0
except NotImplementedError:
pass
assert not barrier.broken
def test_barrier(self, passes=1):
"""
Test that a barrier is passed in lockstep
"""
results = [self.DummyList(), self.DummyList()]
self.run_threads(self.multipass, (self.barrier, results, passes))
def test_barrier_10(self):
"""
Test that a barrier works for 10 consecutive runs
"""
return self.test_barrier(10)
@classmethod
def _test_wait_return_f(cls, barrier, queue):
res = barrier.wait()
queue.put(res)
def test_wait_return(self):
"""
test the return value from barrier.wait
"""
queue = self.Queue()
self.run_threads(self._test_wait_return_f, (self.barrier, queue))
results = [queue.get() for i in range(self.N)]
self.assertEqual(results.count(0), 1)
close_queue(queue)
@classmethod
def _test_action_f(cls, barrier, results):
barrier.wait()
if len(results) != 1:
raise RuntimeError
def test_action(self):
"""
Test the 'action' callback
"""
results = self.DummyList()
barrier = self.Barrier(self.N, action=AppendTrue(results))
self.run_threads(self._test_action_f, (barrier, results))
self.assertEqual(len(results), 1)
@classmethod
def _test_abort_f(cls, barrier, results1, results2):
try:
i = barrier.wait()
if i == cls.N//2:
raise RuntimeError
barrier.wait()
results1.append(True)
except threading.BrokenBarrierError:
results2.append(True)
except RuntimeError:
barrier.abort()
def test_abort(self):
"""
Test that an abort will put the barrier in a broken state
"""
results1 = self.DummyList()
results2 = self.DummyList()
self.run_threads(self._test_abort_f,
(self.barrier, results1, results2))
self.assertEqual(len(results1), 0)
self.assertEqual(len(results2), self.N-1)
self.assertTrue(self.barrier.broken)
@classmethod
def _test_reset_f(cls, barrier, results1, results2, results3):
i = barrier.wait()
if i == cls.N//2:
# Wait until the other threads are all in the barrier.
while barrier.n_waiting < cls.N-1:
time.sleep(0.001)
barrier.reset()
else:
try:
barrier.wait()
results1.append(True)
except threading.BrokenBarrierError:
results2.append(True)
# Now, pass the barrier again
barrier.wait()
results3.append(True)
def test_reset(self):
"""
Test that a 'reset' on a barrier frees the waiting threads
"""
results1 = self.DummyList()
results2 = self.DummyList()
results3 = self.DummyList()
self.run_threads(self._test_reset_f,
(self.barrier, results1, results2, results3))
self.assertEqual(len(results1), 0)
self.assertEqual(len(results2), self.N-1)
self.assertEqual(len(results3), self.N)
@classmethod
def _test_abort_and_reset_f(cls, barrier, barrier2,
results1, results2, results3):
try:
i = barrier.wait()
if i == cls.N//2:
raise RuntimeError
barrier.wait()
results1.append(True)
except threading.BrokenBarrierError:
results2.append(True)
except RuntimeError:
barrier.abort()
# Synchronize and reset the barrier. Must synchronize first so
# that everyone has left it when we reset, and after so that no
# one enters it before the reset.
if barrier2.wait() == cls.N//2:
barrier.reset()
barrier2.wait()
barrier.wait()
results3.append(True)
def test_abort_and_reset(self):
"""
Test that a barrier can be reset after being broken.
"""
results1 = self.DummyList()
results2 = self.DummyList()
results3 = self.DummyList()
barrier2 = self.Barrier(self.N)
self.run_threads(self._test_abort_and_reset_f,
(self.barrier, barrier2, results1, results2, results3))
self.assertEqual(len(results1), 0)
self.assertEqual(len(results2), self.N-1)
self.assertEqual(len(results3), self.N)
@classmethod
def _test_timeout_f(cls, barrier, results):
i = barrier.wait()
if i == cls.N//2:
# One thread is late!
time.sleep(1.0)
try:
barrier.wait(0.5)
except threading.BrokenBarrierError:
results.append(True)
def test_timeout(self):
"""
Test wait(timeout)
"""
results = self.DummyList()
self.run_threads(self._test_timeout_f, (self.barrier, results))
self.assertEqual(len(results), self.barrier.parties)
@classmethod
def _test_default_timeout_f(cls, barrier, results):
i = barrier.wait(cls.defaultTimeout)
if i == cls.N//2:
# One thread is later than the default timeout
time.sleep(1.0)
try:
barrier.wait()
except threading.BrokenBarrierError:
results.append(True)
def test_default_timeout(self):
"""
Test the barrier's default timeout
"""
barrier = self.Barrier(self.N, timeout=0.5)
results = self.DummyList()
self.run_threads(self._test_default_timeout_f, (barrier, results))
self.assertEqual(len(results), barrier.parties)
def test_single_thread(self):
b = self.Barrier(1)
b.wait()
b.wait()
@classmethod
def _test_thousand_f(cls, barrier, passes, conn, lock):
for i in range(passes):
barrier.wait()
with lock:
conn.send(i)
def test_thousand(self):
if self.TYPE == 'manager':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
passes = 1000
lock = self.Lock()
conn, child_conn = self.Pipe(False)
for j in range(self.N):
p = self.Process(target=self._test_thousand_f,
args=(self.barrier, passes, child_conn, lock))
p.start()
self.addCleanup(p.join)
for i in range(passes):
for j in range(self.N):
self.assertEqual(conn.recv(), i)
#
#
#
class _TestValue(BaseTestCase):
ALLOWED_TYPES = ('processes',)
codes_values = [
('i', 4343, 24234),
('d', 3.625, -4.25),
('h', -232, 234),
('q', 2 ** 33, 2 ** 34),
('c', latin('x'), latin('y'))
]
def setUp(self):
if not HAS_SHAREDCTYPES:
self.skipTest("requires multiprocessing.sharedctypes")
@classmethod
def _test(cls, values):
for sv, cv in zip(values, cls.codes_values):
sv.value = cv[2]
def test_value(self, raw=False):
if raw:
values = [self.RawValue(code, value)
for code, value, _ in self.codes_values]
else:
values = [self.Value(code, value)
for code, value, _ in self.codes_values]
for sv, cv in zip(values, self.codes_values):
self.assertEqual(sv.value, cv[1])
proc = self.Process(target=self._test, args=(values,))
proc.daemon = True
proc.start()
proc.join()
for sv, cv in zip(values, self.codes_values):
self.assertEqual(sv.value, cv[2])
def test_rawvalue(self):
self.test_value(raw=True)
def test_getobj_getlock(self):
val1 = self.Value('i', 5)
lock1 = val1.get_lock()
obj1 = val1.get_obj()
val2 = self.Value('i', 5, lock=None)
lock2 = val2.get_lock()
obj2 = val2.get_obj()
lock = self.Lock()
val3 = self.Value('i', 5, lock=lock)
lock3 = val3.get_lock()
obj3 = val3.get_obj()
self.assertEqual(lock, lock3)
arr4 = self.Value('i', 5, lock=False)
self.assertFalse(hasattr(arr4, 'get_lock'))
self.assertFalse(hasattr(arr4, 'get_obj'))
self.assertRaises(AttributeError, self.Value, 'i', 5, lock='navalue')
arr5 = self.RawValue('i', 5)
self.assertFalse(hasattr(arr5, 'get_lock'))
self.assertFalse(hasattr(arr5, 'get_obj'))
class _TestArray(BaseTestCase):
ALLOWED_TYPES = ('processes',)
@classmethod
def f(cls, seq):
for i in range(1, len(seq)):
seq[i] += seq[i-1]
@unittest.skipIf(c_int is None, "requires _ctypes")
def test_array(self, raw=False):
seq = [680, 626, 934, 821, 150, 233, 548, 982, 714, 831]
if raw:
arr = self.RawArray('i', seq)
else:
arr = self.Array('i', seq)
self.assertEqual(len(arr), len(seq))
self.assertEqual(arr[3], seq[3])
self.assertEqual(list(arr[2:7]), list(seq[2:7]))
arr[4:8] = seq[4:8] = array.array('i', [1, 2, 3, 4])
self.assertEqual(list(arr[:]), seq)
self.f(seq)
p = self.Process(target=self.f, args=(arr,))
p.daemon = True
p.start()
p.join()
self.assertEqual(list(arr[:]), seq)
@unittest.skipIf(c_int is None, "requires _ctypes")
def test_array_from_size(self):
size = 10
# Test for zeroing (see issue #11675).
# The repetition below strengthens the test by increasing the chances
# of previously allocated non-zero memory being used for the new array
# on the 2nd and 3rd loops.
for _ in range(3):
arr = self.Array('i', size)
self.assertEqual(len(arr), size)
self.assertEqual(list(arr), [0] * size)
arr[:] = range(10)
self.assertEqual(list(arr), list(range(10)))
del arr
@unittest.skipIf(c_int is None, "requires _ctypes")
def test_rawarray(self):
self.test_array(raw=True)
@unittest.skipIf(c_int is None, "requires _ctypes")
def test_getobj_getlock_obj(self):
arr1 = self.Array('i', list(range(10)))
lock1 = arr1.get_lock()
obj1 = arr1.get_obj()
arr2 = self.Array('i', list(range(10)), lock=None)
lock2 = arr2.get_lock()
obj2 = arr2.get_obj()
lock = self.Lock()
arr3 = self.Array('i', list(range(10)), lock=lock)
lock3 = arr3.get_lock()
obj3 = arr3.get_obj()
self.assertEqual(lock, lock3)
arr4 = self.Array('i', range(10), lock=False)
self.assertFalse(hasattr(arr4, 'get_lock'))
self.assertFalse(hasattr(arr4, 'get_obj'))
self.assertRaises(AttributeError,
self.Array, 'i', range(10), lock='notalock')
arr5 = self.RawArray('i', range(10))
self.assertFalse(hasattr(arr5, 'get_lock'))
self.assertFalse(hasattr(arr5, 'get_obj'))
#
#
#
class _TestContainers(BaseTestCase):
ALLOWED_TYPES = ('manager',)
def test_list(self):
a = self.list(list(range(10)))
self.assertEqual(a[:], list(range(10)))
b = self.list()
self.assertEqual(b[:], [])
b.extend(list(range(5)))
self.assertEqual(b[:], list(range(5)))
self.assertEqual(b[2], 2)
self.assertEqual(b[2:10], [2,3,4])
b *= 2
self.assertEqual(b[:], [0, 1, 2, 3, 4, 0, 1, 2, 3, 4])
self.assertEqual(b + [5, 6], [0, 1, 2, 3, 4, 0, 1, 2, 3, 4, 5, 6])
self.assertEqual(a[:], list(range(10)))
d = [a, b]
e = self.list(d)
self.assertEqual(
[element[:] for element in e],
[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [0, 1, 2, 3, 4, 0, 1, 2, 3, 4]]
)
f = self.list([a])
a.append('hello')
self.assertEqual(f[0][:], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'hello'])
def test_list_iter(self):
a = self.list(list(range(10)))
it = iter(a)
self.assertEqual(list(it), list(range(10)))
self.assertEqual(list(it), []) # exhausted
# list modified during iteration
it = iter(a)
a[0] = 100
self.assertEqual(next(it), 100)
def test_list_proxy_in_list(self):
a = self.list([self.list(range(3)) for _i in range(3)])
self.assertEqual([inner[:] for inner in a], [[0, 1, 2]] * 3)
a[0][-1] = 55
self.assertEqual(a[0][:], [0, 1, 55])
for i in range(1, 3):
self.assertEqual(a[i][:], [0, 1, 2])
self.assertEqual(a[1].pop(), 2)
self.assertEqual(len(a[1]), 2)
for i in range(0, 3, 2):
self.assertEqual(len(a[i]), 3)
del a
b = self.list()
b.append(b)
del b
def test_dict(self):
d = self.dict()
indices = list(range(65, 70))
for i in indices:
d[i] = chr(i)
self.assertEqual(d.copy(), dict((i, chr(i)) for i in indices))
self.assertEqual(sorted(d.keys()), indices)
self.assertEqual(sorted(d.values()), [chr(i) for i in indices])
self.assertEqual(sorted(d.items()), [(i, chr(i)) for i in indices])
def test_dict_iter(self):
d = self.dict()
indices = list(range(65, 70))
for i in indices:
d[i] = chr(i)
it = iter(d)
self.assertEqual(list(it), indices)
self.assertEqual(list(it), []) # exhausted
# dictionary changed size during iteration
it = iter(d)
d.clear()
self.assertRaises(RuntimeError, next, it)
def test_dict_proxy_nested(self):
pets = self.dict(ferrets=2, hamsters=4)
supplies = self.dict(water=10, feed=3)
d = self.dict(pets=pets, supplies=supplies)
self.assertEqual(supplies['water'], 10)
self.assertEqual(d['supplies']['water'], 10)
d['supplies']['blankets'] = 5
self.assertEqual(supplies['blankets'], 5)
self.assertEqual(d['supplies']['blankets'], 5)
d['supplies']['water'] = 7
self.assertEqual(supplies['water'], 7)
self.assertEqual(d['supplies']['water'], 7)
del pets
del supplies
self.assertEqual(d['pets']['ferrets'], 2)
d['supplies']['blankets'] = 11
self.assertEqual(d['supplies']['blankets'], 11)
pets = d['pets']
supplies = d['supplies']
supplies['water'] = 7
self.assertEqual(supplies['water'], 7)
self.assertEqual(d['supplies']['water'], 7)
d.clear()
self.assertEqual(len(d), 0)
self.assertEqual(supplies['water'], 7)
self.assertEqual(pets['hamsters'], 4)
l = self.list([pets, supplies])
l[0]['marmots'] = 1
self.assertEqual(pets['marmots'], 1)
self.assertEqual(l[0]['marmots'], 1)
del pets
del supplies
self.assertEqual(l[0]['marmots'], 1)
outer = self.list([[88, 99], l])
self.assertIsInstance(outer[0], list) # Not a ListProxy
self.assertEqual(outer[-1][-1]['feed'], 3)
def test_nested_queue(self):
a = self.list() # Test queue inside list
a.append(self.Queue())
a[0].put(123)
self.assertEqual(a[0].get(), 123)
b = self.dict() # Test queue inside dict
b[0] = self.Queue()
b[0].put(456)
self.assertEqual(b[0].get(), 456)
def test_namespace(self):
n = self.Namespace()
n.name = 'Bob'
n.job = 'Builder'
n._hidden = 'hidden'
self.assertEqual((n.name, n.job), ('Bob', 'Builder'))
del n.job
self.assertEqual(str(n), "Namespace(name='Bob')")
self.assertTrue(hasattr(n, 'name'))
self.assertTrue(not hasattr(n, 'job'))
#
#
#
def sqr(x, wait=0.0):
time.sleep(wait)
return x*x
def mul(x, y):
return x*y
def raise_large_valuerror(wait):
time.sleep(wait)
raise ValueError("x" * 1024**2)
def identity(x):
return x
class CountedObject(object):
n_instances = 0
def __new__(cls):
cls.n_instances += 1
return object.__new__(cls)
def __del__(self):
type(self).n_instances -= 1
class SayWhenError(ValueError): pass
def exception_throwing_generator(total, when):
if when == -1:
raise SayWhenError("Somebody said when")
for i in range(total):
if i == when:
raise SayWhenError("Somebody said when")
yield i
class _TestPool(BaseTestCase):
@classmethod
def setUpClass(cls):
super().setUpClass()
cls.pool = cls.Pool(4)
@classmethod
def tearDownClass(cls):
cls.pool.terminate()
cls.pool.join()
cls.pool = None
super().tearDownClass()
def test_apply(self):
papply = self.pool.apply
self.assertEqual(papply(sqr, (5,)), sqr(5))
self.assertEqual(papply(sqr, (), {'x':3}), sqr(x=3))
def test_map(self):
pmap = self.pool.map
self.assertEqual(pmap(sqr, list(range(10))), list(map(sqr, list(range(10)))))
self.assertEqual(pmap(sqr, list(range(100)), chunksize=20),
list(map(sqr, list(range(100)))))
def test_starmap(self):
psmap = self.pool.starmap
tuples = list(zip(range(10), range(9,-1, -1)))
self.assertEqual(psmap(mul, tuples),
list(itertools.starmap(mul, tuples)))
tuples = list(zip(range(100), range(99,-1, -1)))
self.assertEqual(psmap(mul, tuples, chunksize=20),
list(itertools.starmap(mul, tuples)))
def test_starmap_async(self):
tuples = list(zip(range(100), range(99,-1, -1)))
self.assertEqual(self.pool.starmap_async(mul, tuples).get(),
list(itertools.starmap(mul, tuples)))
def test_map_async(self):
self.assertEqual(self.pool.map_async(sqr, list(range(10))).get(),
list(map(sqr, list(range(10)))))
def test_map_async_callbacks(self):
call_args = self.manager.list() if self.TYPE == 'manager' else []
self.pool.map_async(int, ['1'],
callback=call_args.append,
error_callback=call_args.append).wait()
self.assertEqual(1, len(call_args))
self.assertEqual([1], call_args[0])
self.pool.map_async(int, ['a'],
callback=call_args.append,
error_callback=call_args.append).wait()
self.assertEqual(2, len(call_args))
self.assertIsInstance(call_args[1], ValueError)
def test_map_unplicklable(self):
# Issue #19425 -- failure to pickle should not cause a hang
if self.TYPE == 'threads':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
class A(object):
def __reduce__(self):
raise RuntimeError('cannot pickle')
with self.assertRaises(RuntimeError):
self.pool.map(sqr, [A()]*10)
def test_map_chunksize(self):
try:
self.pool.map_async(sqr, [], chunksize=1).get(timeout=TIMEOUT1)
except multiprocessing.TimeoutError:
self.fail("pool.map_async with chunksize stalled on null list")
def test_map_handle_iterable_exception(self):
if self.TYPE == 'manager':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
# SayWhenError seen at the very first of the iterable
with self.assertRaises(SayWhenError):
self.pool.map(sqr, exception_throwing_generator(1, -1), 1)
# again, make sure it's reentrant
with self.assertRaises(SayWhenError):
self.pool.map(sqr, exception_throwing_generator(1, -1), 1)
with self.assertRaises(SayWhenError):
self.pool.map(sqr, exception_throwing_generator(10, 3), 1)
class SpecialIterable:
def __iter__(self):
return self
def __next__(self):
raise SayWhenError
def __len__(self):
return 1
with self.assertRaises(SayWhenError):
self.pool.map(sqr, SpecialIterable(), 1)
with self.assertRaises(SayWhenError):
self.pool.map(sqr, SpecialIterable(), 1)
def test_async(self):
res = self.pool.apply_async(sqr, (7, TIMEOUT1,))
get = TimingWrapper(res.get)
self.assertEqual(get(), 49)
self.assertTimingAlmostEqual(get.elapsed, TIMEOUT1)
def test_async_timeout(self):
res = self.pool.apply_async(sqr, (6, TIMEOUT2 + 1.0))
get = TimingWrapper(res.get)
self.assertRaises(multiprocessing.TimeoutError, get, timeout=TIMEOUT2)
self.assertTimingAlmostEqual(get.elapsed, TIMEOUT2)
def test_imap(self):
it = self.pool.imap(sqr, list(range(10)))
self.assertEqual(list(it), list(map(sqr, list(range(10)))))
it = self.pool.imap(sqr, list(range(10)))
for i in range(10):
self.assertEqual(next(it), i*i)
self.assertRaises(StopIteration, it.__next__)
it = self.pool.imap(sqr, list(range(1000)), chunksize=100)
for i in range(1000):
self.assertEqual(next(it), i*i)
self.assertRaises(StopIteration, it.__next__)
def test_imap_handle_iterable_exception(self):
if self.TYPE == 'manager':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
# SayWhenError seen at the very first of the iterable
it = self.pool.imap(sqr, exception_throwing_generator(1, -1), 1)
self.assertRaises(SayWhenError, it.__next__)
# again, make sure it's reentrant
it = self.pool.imap(sqr, exception_throwing_generator(1, -1), 1)
self.assertRaises(SayWhenError, it.__next__)
it = self.pool.imap(sqr, exception_throwing_generator(10, 3), 1)
for i in range(3):
self.assertEqual(next(it), i*i)
self.assertRaises(SayWhenError, it.__next__)
# SayWhenError seen at start of problematic chunk's results
it = self.pool.imap(sqr, exception_throwing_generator(20, 7), 2)
for i in range(6):
self.assertEqual(next(it), i*i)
self.assertRaises(SayWhenError, it.__next__)
it = self.pool.imap(sqr, exception_throwing_generator(20, 7), 4)
for i in range(4):
self.assertEqual(next(it), i*i)
self.assertRaises(SayWhenError, it.__next__)
def test_imap_unordered(self):
it = self.pool.imap_unordered(sqr, list(range(10)))
self.assertEqual(sorted(it), list(map(sqr, list(range(10)))))
it = self.pool.imap_unordered(sqr, list(range(1000)), chunksize=100)
self.assertEqual(sorted(it), list(map(sqr, list(range(1000)))))
def test_imap_unordered_handle_iterable_exception(self):
if self.TYPE == 'manager':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
# SayWhenError seen at the very first of the iterable
it = self.pool.imap_unordered(sqr,
exception_throwing_generator(1, -1),
1)
self.assertRaises(SayWhenError, it.__next__)
# again, make sure it's reentrant
it = self.pool.imap_unordered(sqr,
exception_throwing_generator(1, -1),
1)
self.assertRaises(SayWhenError, it.__next__)
it = self.pool.imap_unordered(sqr,
exception_throwing_generator(10, 3),
1)
expected_values = list(map(sqr, list(range(10))))
with self.assertRaises(SayWhenError):
# imap_unordered makes it difficult to anticipate the SayWhenError
for i in range(10):
value = next(it)
self.assertIn(value, expected_values)
expected_values.remove(value)
it = self.pool.imap_unordered(sqr,
exception_throwing_generator(20, 7),
2)
expected_values = list(map(sqr, list(range(20))))
with self.assertRaises(SayWhenError):
for i in range(20):
value = next(it)
self.assertIn(value, expected_values)
expected_values.remove(value)
def test_make_pool(self):
expected_error = (RemoteError if self.TYPE == 'manager'
else ValueError)
self.assertRaises(expected_error, self.Pool, -1)
self.assertRaises(expected_error, self.Pool, 0)
if self.TYPE != 'manager':
p = self.Pool(3)
try:
self.assertEqual(3, len(p._pool))
finally:
p.close()
p.join()
def test_terminate(self):
result = self.pool.map_async(
time.sleep, [0.1 for i in range(10000)], chunksize=1
)
self.pool.terminate()
join = TimingWrapper(self.pool.join)
join()
# Sanity check the pool didn't wait for all tasks to finish
self.assertLess(join.elapsed, 2.0)
def test_empty_iterable(self):
# See Issue 12157
p = self.Pool(1)
self.assertEqual(p.map(sqr, []), [])
self.assertEqual(list(p.imap(sqr, [])), [])
self.assertEqual(list(p.imap_unordered(sqr, [])), [])
self.assertEqual(p.map_async(sqr, []).get(), [])
p.close()
p.join()
def test_context(self):
if self.TYPE == 'processes':
L = list(range(10))
expected = [sqr(i) for i in L]
with self.Pool(2) as p:
r = p.map_async(sqr, L)
self.assertEqual(r.get(), expected)
p.join()
self.assertRaises(ValueError, p.map_async, sqr, L)
@classmethod
def _test_traceback(cls):
raise RuntimeError(123) # some comment
def test_traceback(self):
# We want ensure that the traceback from the child process is
# contained in the traceback raised in the main process.
if self.TYPE == 'processes':
with self.Pool(1) as p:
try:
p.apply(self._test_traceback)
except Exception as e:
exc = e
else:
self.fail('expected RuntimeError')
p.join()
self.assertIs(type(exc), RuntimeError)
self.assertEqual(exc.args, (123,))
cause = exc.__cause__
self.assertIs(type(cause), multiprocessing.pool.RemoteTraceback)
self.assertIn('raise RuntimeError(123) # some comment', cause.tb)
with test.support.captured_stderr() as f1:
try:
raise exc
except RuntimeError:
sys.excepthook(*sys.exc_info())
self.assertIn('raise RuntimeError(123) # some comment',
f1.getvalue())
# _helper_reraises_exception should not make the error
# a remote exception
with self.Pool(1) as p:
try:
p.map(sqr, exception_throwing_generator(1, -1), 1)
except Exception as e:
exc = e
else:
self.fail('expected SayWhenError')
self.assertIs(type(exc), SayWhenError)
self.assertIs(exc.__cause__, None)
p.join()
@classmethod
def _test_wrapped_exception(cls):
raise RuntimeError('foo')
def test_wrapped_exception(self):
# Issue #20980: Should not wrap exception when using thread pool
with self.Pool(1) as p:
with self.assertRaises(RuntimeError):
p.apply(self._test_wrapped_exception)
p.join()
def test_map_no_failfast(self):
# Issue #23992: the fail-fast behaviour when an exception is raised
# during map() would make Pool.join() deadlock, because a worker
# process would fill the result queue (after the result handler thread
# terminated, hence not draining it anymore).
t_start = time.monotonic()
with self.assertRaises(ValueError):
with self.Pool(2) as p:
try:
p.map(raise_large_valuerror, [0, 1])
finally:
time.sleep(0.5)
p.close()
p.join()
# check that we indeed waited for all jobs
self.assertGreater(time.monotonic() - t_start, 0.9)
def test_release_task_refs(self):
# Issue #29861: task arguments and results should not be kept
# alive after we are done with them.
objs = [CountedObject() for i in range(10)]
refs = [weakref.ref(o) for o in objs]
self.pool.map(identity, objs)
del objs
gc.collect() # For PyPy or other GCs.
time.sleep(DELTA) # let threaded cleanup code run
self.assertEqual(set(wr() for wr in refs), {None})
# With a process pool, copies of the objects are returned, check
# they were released too.
self.assertEqual(CountedObject.n_instances, 0)
def test_enter(self):
if self.TYPE == 'manager':
self.skipTest("test not applicable to manager")
pool = self.Pool(1)
with pool:
pass
# call pool.terminate()
# pool is no longer running
with self.assertRaises(ValueError):
# bpo-35477: pool.__enter__() fails if the pool is not running
with pool:
pass
pool.join()
def test_resource_warning(self):
if self.TYPE == 'manager':
self.skipTest("test not applicable to manager")
pool = self.Pool(1)
pool.terminate()
pool.join()
# force state to RUN to emit ResourceWarning in __del__()
pool._state = multiprocessing.pool.RUN
with warnings_helper.check_warnings(
('unclosed running multiprocessing pool', ResourceWarning)):
pool = None
support.gc_collect()
def raising():
raise KeyError("key")
def unpickleable_result():
return lambda: 42
class _TestPoolWorkerErrors(BaseTestCase):
ALLOWED_TYPES = ('processes', )
def test_async_error_callback(self):
p = multiprocessing.Pool(2)
scratchpad = [None]
def errback(exc):
scratchpad[0] = exc
res = p.apply_async(raising, error_callback=errback)
self.assertRaises(KeyError, res.get)
self.assertTrue(scratchpad[0])
self.assertIsInstance(scratchpad[0], KeyError)
p.close()
p.join()
def test_unpickleable_result(self):
from multiprocessing.pool import MaybeEncodingError
p = multiprocessing.Pool(2)
# Make sure we don't lose pool processes because of encoding errors.
for iteration in range(20):
scratchpad = [None]
def errback(exc):
scratchpad[0] = exc
res = p.apply_async(unpickleable_result, error_callback=errback)
self.assertRaises(MaybeEncodingError, res.get)
wrapped = scratchpad[0]
self.assertTrue(wrapped)
self.assertIsInstance(scratchpad[0], MaybeEncodingError)
self.assertIsNotNone(wrapped.exc)
self.assertIsNotNone(wrapped.value)
p.close()
p.join()
class _TestPoolWorkerLifetime(BaseTestCase):
ALLOWED_TYPES = ('processes', )
def test_pool_worker_lifetime(self):
p = multiprocessing.Pool(3, maxtasksperchild=10)
self.assertEqual(3, len(p._pool))
origworkerpids = [w.pid for w in p._pool]
# Run many tasks so each worker gets replaced (hopefully)
results = []
for i in range(100):
results.append(p.apply_async(sqr, (i, )))
# Fetch the results and verify we got the right answers,
# also ensuring all the tasks have completed.
for (j, res) in enumerate(results):
self.assertEqual(res.get(), sqr(j))
# Refill the pool
p._repopulate_pool()
# Wait until all workers are alive
# (countdown * DELTA = 5 seconds max startup process time)
countdown = 50
while countdown and not all(w.is_alive() for w in p._pool):
countdown -= 1
time.sleep(DELTA)
finalworkerpids = [w.pid for w in p._pool]
# All pids should be assigned. See issue #7805.
self.assertNotIn(None, origworkerpids)
self.assertNotIn(None, finalworkerpids)
# Finally, check that the worker pids have changed
self.assertNotEqual(sorted(origworkerpids), sorted(finalworkerpids))
p.close()
p.join()
def test_pool_worker_lifetime_early_close(self):
# Issue #10332: closing a pool whose workers have limited lifetimes
# before all the tasks completed would make join() hang.
p = multiprocessing.Pool(3, maxtasksperchild=1)
results = []
for i in range(6):
results.append(p.apply_async(sqr, (i, 0.3)))
p.close()
p.join()
# check the results
for (j, res) in enumerate(results):
self.assertEqual(res.get(), sqr(j))
def test_pool_maxtasksperchild_invalid(self):
for value in [0, -1, 0.5, "12"]:
with self.assertRaises(ValueError):
multiprocessing.Pool(3, maxtasksperchild=value)
def test_worker_finalization_via_atexit_handler_of_multiprocessing(self):
# tests cases against bpo-38744 and bpo-39360
cmd = '''if 1:
from multiprocessing import Pool
problem = None
class A:
def __init__(self):
self.pool = Pool(processes=1)
def test():
global problem
problem = A()
problem.pool.map(float, tuple(range(10)))
if __name__ == "__main__":
test()
'''
rc, out, err = test.support.script_helper.assert_python_ok('-c', cmd)
self.assertEqual(rc, 0)
#
# Test of creating a customized manager class
#
from multiprocessing.managers import BaseManager, BaseProxy, RemoteError
class FooBar(object):
def f(self):
return 'f()'
def g(self):
raise ValueError
def _h(self):
return '_h()'
def baz():
for i in range(10):
yield i*i
class IteratorProxy(BaseProxy):
_exposed_ = ('__next__',)
def __iter__(self):
return self
def __next__(self):
return self._callmethod('__next__')
class MyManager(BaseManager):
pass
MyManager.register('Foo', callable=FooBar)
MyManager.register('Bar', callable=FooBar, exposed=('f', '_h'))
MyManager.register('baz', callable=baz, proxytype=IteratorProxy)
class _TestMyManager(BaseTestCase):
ALLOWED_TYPES = ('manager',)
def test_mymanager(self):
manager = MyManager(shutdown_timeout=SHUTDOWN_TIMEOUT)
manager.start()
self.common(manager)
manager.shutdown()
# bpo-30356: BaseManager._finalize_manager() sends SIGTERM
# to the manager process if it takes longer than 1 second to stop,
# which happens on slow buildbots.
self.assertIn(manager._process.exitcode, (0, -signal.SIGTERM))
def test_mymanager_context(self):
manager = MyManager(shutdown_timeout=SHUTDOWN_TIMEOUT)
with manager:
self.common(manager)
# bpo-30356: BaseManager._finalize_manager() sends SIGTERM
# to the manager process if it takes longer than 1 second to stop,
# which happens on slow buildbots.
self.assertIn(manager._process.exitcode, (0, -signal.SIGTERM))
def test_mymanager_context_prestarted(self):
manager = MyManager(shutdown_timeout=SHUTDOWN_TIMEOUT)
manager.start()
with manager:
self.common(manager)
self.assertEqual(manager._process.exitcode, 0)
def common(self, manager):
foo = manager.Foo()
bar = manager.Bar()
baz = manager.baz()
foo_methods = [name for name in ('f', 'g', '_h') if hasattr(foo, name)]
bar_methods = [name for name in ('f', 'g', '_h') if hasattr(bar, name)]
self.assertEqual(foo_methods, ['f', 'g'])
self.assertEqual(bar_methods, ['f', '_h'])
self.assertEqual(foo.f(), 'f()')
self.assertRaises(ValueError, foo.g)
self.assertEqual(foo._callmethod('f'), 'f()')
self.assertRaises(RemoteError, foo._callmethod, '_h')
self.assertEqual(bar.f(), 'f()')
self.assertEqual(bar._h(), '_h()')
self.assertEqual(bar._callmethod('f'), 'f()')
self.assertEqual(bar._callmethod('_h'), '_h()')
self.assertEqual(list(baz), [i*i for i in range(10)])
#
# Test of connecting to a remote server and using xmlrpclib for serialization
#
_queue = pyqueue.Queue()
def get_queue():
return _queue
class QueueManager(BaseManager):
'''manager class used by server process'''
QueueManager.register('get_queue', callable=get_queue)
class QueueManager2(BaseManager):
'''manager class which specifies the same interface as QueueManager'''
QueueManager2.register('get_queue')
SERIALIZER = 'xmlrpclib'
class _TestRemoteManager(BaseTestCase):
ALLOWED_TYPES = ('manager',)
values = ['hello world', None, True, 2.25,
'hall\xe5 v\xe4rlden',
'\u043f\u0440\u0438\u0432\u0456\u0442 \u0441\u0432\u0456\u0442',
b'hall\xe5 v\xe4rlden',
]
result = values[:]
@classmethod
def _putter(cls, address, authkey):
manager = QueueManager2(
address=address, authkey=authkey, serializer=SERIALIZER,
shutdown_timeout=SHUTDOWN_TIMEOUT)
manager.connect()
queue = manager.get_queue()
# Note that xmlrpclib will deserialize object as a list not a tuple
queue.put(tuple(cls.values))
def test_remote(self):
authkey = os.urandom(32)
manager = QueueManager(
address=(socket_helper.HOST, 0), authkey=authkey, serializer=SERIALIZER,
shutdown_timeout=SHUTDOWN_TIMEOUT)
manager.start()
self.addCleanup(manager.shutdown)
p = self.Process(target=self._putter, args=(manager.address, authkey))
p.daemon = True
p.start()
manager2 = QueueManager2(
address=manager.address, authkey=authkey, serializer=SERIALIZER,
shutdown_timeout=SHUTDOWN_TIMEOUT)
manager2.connect()
queue = manager2.get_queue()
self.assertEqual(queue.get(), self.result)
# Because we are using xmlrpclib for serialization instead of
# pickle this will cause a serialization error.
self.assertRaises(Exception, queue.put, time.sleep)
# Make queue finalizer run before the server is stopped
del queue
@hashlib_helper.requires_hashdigest('md5')
class _TestManagerRestart(BaseTestCase):
@classmethod
def _putter(cls, address, authkey):
manager = QueueManager(
address=address, authkey=authkey, serializer=SERIALIZER,
shutdown_timeout=SHUTDOWN_TIMEOUT)
manager.connect()
queue = manager.get_queue()
queue.put('hello world')
def test_rapid_restart(self):
authkey = os.urandom(32)
manager = QueueManager(
address=(socket_helper.HOST, 0), authkey=authkey,
serializer=SERIALIZER, shutdown_timeout=SHUTDOWN_TIMEOUT)
try:
srvr = manager.get_server()
addr = srvr.address
# Close the connection.Listener socket which gets opened as a part
# of manager.get_server(). It's not needed for the test.
srvr.listener.close()
manager.start()
p = self.Process(target=self._putter, args=(manager.address, authkey))
p.start()
p.join()
queue = manager.get_queue()
self.assertEqual(queue.get(), 'hello world')
del queue
finally:
if hasattr(manager, "shutdown"):
manager.shutdown()
manager = QueueManager(
address=addr, authkey=authkey, serializer=SERIALIZER,
shutdown_timeout=SHUTDOWN_TIMEOUT)
try:
manager.start()
self.addCleanup(manager.shutdown)
except OSError as e:
if e.errno != errno.EADDRINUSE:
raise
# Retry after some time, in case the old socket was lingering
# (sporadic failure on buildbots)
time.sleep(1.0)
manager = QueueManager(
address=addr, authkey=authkey, serializer=SERIALIZER,
shutdown_timeout=SHUTDOWN_TIMEOUT)
if hasattr(manager, "shutdown"):
self.addCleanup(manager.shutdown)
#
#
#
SENTINEL = latin('')
class _TestConnection(BaseTestCase):
ALLOWED_TYPES = ('processes', 'threads')
@classmethod
def _echo(cls, conn):
for msg in iter(conn.recv_bytes, SENTINEL):
conn.send_bytes(msg)
conn.close()
def test_connection(self):
conn, child_conn = self.Pipe()
p = self.Process(target=self._echo, args=(child_conn,))
p.daemon = True
p.start()
seq = [1, 2.25, None]
msg = latin('hello world')
longmsg = msg * 10
arr = array.array('i', list(range(4)))
if self.TYPE == 'processes':
self.assertEqual(type(conn.fileno()), int)
self.assertEqual(conn.send(seq), None)
self.assertEqual(conn.recv(), seq)
self.assertEqual(conn.send_bytes(msg), None)
self.assertEqual(conn.recv_bytes(), msg)
if self.TYPE == 'processes':
buffer = array.array('i', [0]*10)
expected = list(arr) + [0] * (10 - len(arr))
self.assertEqual(conn.send_bytes(arr), None)
self.assertEqual(conn.recv_bytes_into(buffer),
len(arr) * buffer.itemsize)
self.assertEqual(list(buffer), expected)
buffer = array.array('i', [0]*10)
expected = [0] * 3 + list(arr) + [0] * (10 - 3 - len(arr))
self.assertEqual(conn.send_bytes(arr), None)
self.assertEqual(conn.recv_bytes_into(buffer, 3 * buffer.itemsize),
len(arr) * buffer.itemsize)
self.assertEqual(list(buffer), expected)
buffer = bytearray(latin(' ' * 40))
self.assertEqual(conn.send_bytes(longmsg), None)
try:
res = conn.recv_bytes_into(buffer)
except multiprocessing.BufferTooShort as e:
self.assertEqual(e.args, (longmsg,))
else:
self.fail('expected BufferTooShort, got %s' % res)
poll = TimingWrapper(conn.poll)
self.assertEqual(poll(), False)
self.assertTimingAlmostEqual(poll.elapsed, 0)
self.assertEqual(poll(-1), False)
self.assertTimingAlmostEqual(poll.elapsed, 0)
self.assertEqual(poll(TIMEOUT1), False)
self.assertTimingAlmostEqual(poll.elapsed, TIMEOUT1)
conn.send(None)
time.sleep(.1)
self.assertEqual(poll(TIMEOUT1), True)
self.assertTimingAlmostEqual(poll.elapsed, 0)
self.assertEqual(conn.recv(), None)
really_big_msg = latin('X') * (1024 * 1024 * 16) # 16Mb
conn.send_bytes(really_big_msg)
self.assertEqual(conn.recv_bytes(), really_big_msg)
conn.send_bytes(SENTINEL) # tell child to quit
child_conn.close()
if self.TYPE == 'processes':
self.assertEqual(conn.readable, True)
self.assertEqual(conn.writable, True)
self.assertRaises(EOFError, conn.recv)
self.assertRaises(EOFError, conn.recv_bytes)
p.join()
def test_duplex_false(self):
reader, writer = self.Pipe(duplex=False)
self.assertEqual(writer.send(1), None)
self.assertEqual(reader.recv(), 1)
if self.TYPE == 'processes':
self.assertEqual(reader.readable, True)
self.assertEqual(reader.writable, False)
self.assertEqual(writer.readable, False)
self.assertEqual(writer.writable, True)
self.assertRaises(OSError, reader.send, 2)
self.assertRaises(OSError, writer.recv)
self.assertRaises(OSError, writer.poll)
def test_spawn_close(self):
# We test that a pipe connection can be closed by parent
# process immediately after child is spawned. On Windows this
# would have sometimes failed on old versions because
# child_conn would be closed before the child got a chance to
# duplicate it.
conn, child_conn = self.Pipe()
p = self.Process(target=self._echo, args=(child_conn,))
p.daemon = True
p.start()
child_conn.close() # this might complete before child initializes
msg = latin('hello')
conn.send_bytes(msg)
self.assertEqual(conn.recv_bytes(), msg)
conn.send_bytes(SENTINEL)
conn.close()
p.join()
def test_sendbytes(self):
if self.TYPE != 'processes':
self.skipTest('test not appropriate for {}'.format(self.TYPE))
msg = latin('abcdefghijklmnopqrstuvwxyz')
a, b = self.Pipe()
a.send_bytes(msg)
self.assertEqual(b.recv_bytes(), msg)
a.send_bytes(msg, 5)
self.assertEqual(b.recv_bytes(), msg[5:])
a.send_bytes(msg, 7, 8)
self.assertEqual(b.recv_bytes(), msg[7:7+8])
a.send_bytes(msg, 26)
self.assertEqual(b.recv_bytes(), latin(''))
a.send_bytes(msg, 26, 0)
self.assertEqual(b.recv_bytes(), latin(''))
self.assertRaises(ValueError, a.send_bytes, msg, 27)
self.assertRaises(ValueError, a.send_bytes, msg, 22, 5)
self.assertRaises(ValueError, a.send_bytes, msg, 26, 1)
self.assertRaises(ValueError, a.send_bytes, msg, -1)
self.assertRaises(ValueError, a.send_bytes, msg, 4, -1)
@classmethod
def _is_fd_assigned(cls, fd):
try:
os.fstat(fd)
except OSError as e:
if e.errno == errno.EBADF:
return False
raise
else:
return True
@classmethod
def _writefd(cls, conn, data, create_dummy_fds=False):
if create_dummy_fds:
for i in range(0, 256):
if not cls._is_fd_assigned(i):
os.dup2(conn.fileno(), i)
fd = reduction.recv_handle(conn)
if msvcrt:
fd = msvcrt.open_osfhandle(fd, os.O_WRONLY)
os.write(fd, data)
os.close(fd)
@unittest.skipUnless(HAS_REDUCTION, "test needs multiprocessing.reduction")
def test_fd_transfer(self):
if self.TYPE != 'processes':
self.skipTest("only makes sense with processes")
conn, child_conn = self.Pipe(duplex=True)
p = self.Process(target=self._writefd, args=(child_conn, b"foo"))
p.daemon = True
p.start()
self.addCleanup(os_helper.unlink, os_helper.TESTFN)
with open(os_helper.TESTFN, "wb") as f:
fd = f.fileno()
if msvcrt:
fd = msvcrt.get_osfhandle(fd)
reduction.send_handle(conn, fd, p.pid)
p.join()
with open(os_helper.TESTFN, "rb") as f:
self.assertEqual(f.read(), b"foo")
@unittest.skipUnless(HAS_REDUCTION, "test needs multiprocessing.reduction")
@unittest.skipIf(sys.platform == "win32",
"test semantics don't make sense on Windows")
@unittest.skipIf(MAXFD <= 256,
"largest assignable fd number is too small")
@unittest.skipUnless(hasattr(os, "dup2"),
"test needs os.dup2()")
def test_large_fd_transfer(self):
# With fd > 256 (issue #11657)
if self.TYPE != 'processes':
self.skipTest("only makes sense with processes")
conn, child_conn = self.Pipe(duplex=True)
p = self.Process(target=self._writefd, args=(child_conn, b"bar", True))
p.daemon = True
p.start()
self.addCleanup(os_helper.unlink, os_helper.TESTFN)
with open(os_helper.TESTFN, "wb") as f:
fd = f.fileno()
for newfd in range(256, MAXFD):
if not self._is_fd_assigned(newfd):
break
else:
self.fail("could not find an unassigned large file descriptor")
os.dup2(fd, newfd)
try:
reduction.send_handle(conn, newfd, p.pid)
finally:
os.close(newfd)
p.join()
with open(os_helper.TESTFN, "rb") as f:
self.assertEqual(f.read(), b"bar")
@classmethod
def _send_data_without_fd(self, conn):
os.write(conn.fileno(), b"\0")
@unittest.skipUnless(HAS_REDUCTION, "test needs multiprocessing.reduction")
@unittest.skipIf(sys.platform == "win32", "doesn't make sense on Windows")
def test_missing_fd_transfer(self):
# Check that exception is raised when received data is not
# accompanied by a file descriptor in ancillary data.
if self.TYPE != 'processes':
self.skipTest("only makes sense with processes")
conn, child_conn = self.Pipe(duplex=True)
p = self.Process(target=self._send_data_without_fd, args=(child_conn,))
p.daemon = True
p.start()
self.assertRaises(RuntimeError, reduction.recv_handle, conn)
p.join()
def test_context(self):
a, b = self.Pipe()
with a, b:
a.send(1729)
self.assertEqual(b.recv(), 1729)
if self.TYPE == 'processes':
self.assertFalse(a.closed)
self.assertFalse(b.closed)
if self.TYPE == 'processes':
self.assertTrue(a.closed)
self.assertTrue(b.closed)
self.assertRaises(OSError, a.recv)
self.assertRaises(OSError, b.recv)
class _TestListener(BaseTestCase):
ALLOWED_TYPES = ('processes',)
def test_multiple_bind(self):
for family in self.connection.families:
l = self.connection.Listener(family=family)
self.addCleanup(l.close)
self.assertRaises(OSError, self.connection.Listener,
l.address, family)
def test_context(self):
with self.connection.Listener() as l:
with self.connection.Client(l.address) as c:
with l.accept() as d:
c.send(1729)
self.assertEqual(d.recv(), 1729)
if self.TYPE == 'processes':
self.assertRaises(OSError, l.accept)
@unittest.skipUnless(util.abstract_sockets_supported,
"test needs abstract socket support")
def test_abstract_socket(self):
with self.connection.Listener("\0something") as listener:
with self.connection.Client(listener.address) as client:
with listener.accept() as d:
client.send(1729)
self.assertEqual(d.recv(), 1729)
if self.TYPE == 'processes':
self.assertRaises(OSError, listener.accept)
class _TestListenerClient(BaseTestCase):
ALLOWED_TYPES = ('processes', 'threads')
@classmethod
def _test(cls, address):
conn = cls.connection.Client(address)
conn.send('hello')
conn.close()
def test_listener_client(self):
for family in self.connection.families:
l = self.connection.Listener(family=family)
p = self.Process(target=self._test, args=(l.address,))
p.daemon = True
p.start()
conn = l.accept()
self.assertEqual(conn.recv(), 'hello')
p.join()
l.close()
def test_issue14725(self):
l = self.connection.Listener()
p = self.Process(target=self._test, args=(l.address,))
p.daemon = True
p.start()
time.sleep(1)
# On Windows the client process should by now have connected,
# written data and closed the pipe handle by now. This causes
# ConnectNamdedPipe() to fail with ERROR_NO_DATA. See Issue
# 14725.
conn = l.accept()
self.assertEqual(conn.recv(), 'hello')
conn.close()
p.join()
l.close()
def test_issue16955(self):
for fam in self.connection.families:
l = self.connection.Listener(family=fam)
c = self.connection.Client(l.address)
a = l.accept()
a.send_bytes(b"hello")
self.assertTrue(c.poll(1))
a.close()
c.close()
l.close()
class _TestPoll(BaseTestCase):
ALLOWED_TYPES = ('processes', 'threads')
def test_empty_string(self):
a, b = self.Pipe()
self.assertEqual(a.poll(), False)
b.send_bytes(b'')
self.assertEqual(a.poll(), True)
self.assertEqual(a.poll(), True)
@classmethod
def _child_strings(cls, conn, strings):
for s in strings:
time.sleep(0.1)
conn.send_bytes(s)
conn.close()
def test_strings(self):
strings = (b'hello', b'', b'a', b'b', b'', b'bye', b'', b'lop')
a, b = self.Pipe()
p = self.Process(target=self._child_strings, args=(b, strings))
p.start()
for s in strings:
for i in range(200):
if a.poll(0.01):
break
x = a.recv_bytes()
self.assertEqual(s, x)
p.join()
@classmethod
def _child_boundaries(cls, r):
# Polling may "pull" a message in to the child process, but we
# don't want it to pull only part of a message, as that would
# corrupt the pipe for any other processes which might later
# read from it.
r.poll(5)
def test_boundaries(self):
r, w = self.Pipe(False)
p = self.Process(target=self._child_boundaries, args=(r,))
p.start()
time.sleep(2)
L = [b"first", b"second"]
for obj in L:
w.send_bytes(obj)
w.close()
p.join()
self.assertIn(r.recv_bytes(), L)
@classmethod
def _child_dont_merge(cls, b):
b.send_bytes(b'a')
b.send_bytes(b'b')
b.send_bytes(b'cd')
def test_dont_merge(self):
a, b = self.Pipe()
self.assertEqual(a.poll(0.0), False)
self.assertEqual(a.poll(0.1), False)
p = self.Process(target=self._child_dont_merge, args=(b,))
p.start()
self.assertEqual(a.recv_bytes(), b'a')
self.assertEqual(a.poll(1.0), True)
self.assertEqual(a.poll(1.0), True)
self.assertEqual(a.recv_bytes(), b'b')
self.assertEqual(a.poll(1.0), True)
self.assertEqual(a.poll(1.0), True)
self.assertEqual(a.poll(0.0), True)
self.assertEqual(a.recv_bytes(), b'cd')
p.join()
#
# Test of sending connection and socket objects between processes
#
@unittest.skipUnless(HAS_REDUCTION, "test needs multiprocessing.reduction")
@hashlib_helper.requires_hashdigest('md5')
class _TestPicklingConnections(BaseTestCase):
ALLOWED_TYPES = ('processes',)
@classmethod
def tearDownClass(cls):
from multiprocessing import resource_sharer
resource_sharer.stop(timeout=support.LONG_TIMEOUT)
@classmethod
def _listener(cls, conn, families):
for fam in families:
l = cls.connection.Listener(family=fam)
conn.send(l.address)
new_conn = l.accept()
conn.send(new_conn)
new_conn.close()
l.close()
l = socket.create_server((socket_helper.HOST, 0))
conn.send(l.getsockname())
new_conn, addr = l.accept()
conn.send(new_conn)
new_conn.close()
l.close()
conn.recv()
@classmethod
def _remote(cls, conn):
for (address, msg) in iter(conn.recv, None):
client = cls.connection.Client(address)
client.send(msg.upper())
client.close()
address, msg = conn.recv()
client = socket.socket()
client.connect(address)
client.sendall(msg.upper())
client.close()
conn.close()
def test_pickling(self):
families = self.connection.families
lconn, lconn0 = self.Pipe()
lp = self.Process(target=self._listener, args=(lconn0, families))
lp.daemon = True
lp.start()
lconn0.close()
rconn, rconn0 = self.Pipe()
rp = self.Process(target=self._remote, args=(rconn0,))
rp.daemon = True
rp.start()
rconn0.close()
for fam in families:
msg = ('This connection uses family %s' % fam).encode('ascii')
address = lconn.recv()
rconn.send((address, msg))
new_conn = lconn.recv()
self.assertEqual(new_conn.recv(), msg.upper())
rconn.send(None)
msg = latin('This connection uses a normal socket')
address = lconn.recv()
rconn.send((address, msg))
new_conn = lconn.recv()
buf = []
while True:
s = new_conn.recv(100)
if not s:
break
buf.append(s)
buf = b''.join(buf)
self.assertEqual(buf, msg.upper())
new_conn.close()
lconn.send(None)
rconn.close()
lconn.close()
lp.join()
rp.join()
@classmethod
def child_access(cls, conn):
w = conn.recv()
w.send('all is well')
w.close()
r = conn.recv()
msg = r.recv()
conn.send(msg*2)
conn.close()
def test_access(self):
# On Windows, if we do not specify a destination pid when
# using DupHandle then we need to be careful to use the
# correct access flags for DuplicateHandle(), or else
# DupHandle.detach() will raise PermissionError. For example,
# for a read only pipe handle we should use
# access=FILE_GENERIC_READ. (Unfortunately
# DUPLICATE_SAME_ACCESS does not work.)
conn, child_conn = self.Pipe()
p = self.Process(target=self.child_access, args=(child_conn,))
p.daemon = True
p.start()
child_conn.close()
r, w = self.Pipe(duplex=False)
conn.send(w)
w.close()
self.assertEqual(r.recv(), 'all is well')
r.close()
r, w = self.Pipe(duplex=False)
conn.send(r)
r.close()
w.send('foobar')
w.close()
self.assertEqual(conn.recv(), 'foobar'*2)
p.join()
#
#
#
class _TestHeap(BaseTestCase):
ALLOWED_TYPES = ('processes',)
def setUp(self):
super().setUp()
# Make pristine heap for these tests
self.old_heap = multiprocessing.heap.BufferWrapper._heap
multiprocessing.heap.BufferWrapper._heap = multiprocessing.heap.Heap()
def tearDown(self):
multiprocessing.heap.BufferWrapper._heap = self.old_heap
super().tearDown()
def test_heap(self):
iterations = 5000
maxblocks = 50
blocks = []
# get the heap object
heap = multiprocessing.heap.BufferWrapper._heap
heap._DISCARD_FREE_SPACE_LARGER_THAN = 0
# create and destroy lots of blocks of different sizes
for i in range(iterations):
size = int(random.lognormvariate(0, 1) * 1000)
b = multiprocessing.heap.BufferWrapper(size)
blocks.append(b)
if len(blocks) > maxblocks:
i = random.randrange(maxblocks)
del blocks[i]
del b
# verify the state of the heap
with heap._lock:
all = []
free = 0
occupied = 0
for L in list(heap._len_to_seq.values()):
# count all free blocks in arenas
for arena, start, stop in L:
all.append((heap._arenas.index(arena), start, stop,
stop-start, 'free'))
free += (stop-start)
for arena, arena_blocks in heap._allocated_blocks.items():
# count all allocated blocks in arenas
for start, stop in arena_blocks:
all.append((heap._arenas.index(arena), start, stop,
stop-start, 'occupied'))
occupied += (stop-start)
self.assertEqual(free + occupied,
sum(arena.size for arena in heap._arenas))
all.sort()
for i in range(len(all)-1):
(arena, start, stop) = all[i][:3]
(narena, nstart, nstop) = all[i+1][:3]
if arena != narena:
# Two different arenas
self.assertEqual(stop, heap._arenas[arena].size) # last block
self.assertEqual(nstart, 0) # first block
else:
# Same arena: two adjacent blocks
self.assertEqual(stop, nstart)
# test free'ing all blocks
random.shuffle(blocks)
while blocks:
blocks.pop()
self.assertEqual(heap._n_frees, heap._n_mallocs)
self.assertEqual(len(heap._pending_free_blocks), 0)
self.assertEqual(len(heap._arenas), 0)
self.assertEqual(len(heap._allocated_blocks), 0, heap._allocated_blocks)
self.assertEqual(len(heap._len_to_seq), 0)
def test_free_from_gc(self):
# Check that freeing of blocks by the garbage collector doesn't deadlock
# (issue #12352).
# Make sure the GC is enabled, and set lower collection thresholds to
# make collections more frequent (and increase the probability of
# deadlock).
if not gc.isenabled():
gc.enable()
self.addCleanup(gc.disable)
thresholds = gc.get_threshold()
self.addCleanup(gc.set_threshold, *thresholds)
gc.set_threshold(10)
# perform numerous block allocations, with cyclic references to make
# sure objects are collected asynchronously by the gc
for i in range(5000):
a = multiprocessing.heap.BufferWrapper(1)
b = multiprocessing.heap.BufferWrapper(1)
# circular references
a.buddy = b
b.buddy = a
#
#
#
class _Foo(Structure):
_fields_ = [
('x', c_int),
('y', c_double),
('z', c_longlong,)
]
class _TestSharedCTypes(BaseTestCase):
ALLOWED_TYPES = ('processes',)
def setUp(self):
if not HAS_SHAREDCTYPES:
self.skipTest("requires multiprocessing.sharedctypes")
@classmethod
def _double(cls, x, y, z, foo, arr, string):
x.value *= 2
y.value *= 2
z.value *= 2
foo.x *= 2
foo.y *= 2
string.value *= 2
for i in range(len(arr)):
arr[i] *= 2
def test_sharedctypes(self, lock=False):
x = Value('i', 7, lock=lock)
y = Value(c_double, 1.0/3.0, lock=lock)
z = Value(c_longlong, 2 ** 33, lock=lock)
foo = Value(_Foo, 3, 2, lock=lock)
arr = self.Array('d', list(range(10)), lock=lock)
string = self.Array('c', 20, lock=lock)
string.value = latin('hello')
p = self.Process(target=self._double, args=(x, y, z, foo, arr, string))
p.daemon = True
p.start()
p.join()
self.assertEqual(x.value, 14)
self.assertAlmostEqual(y.value, 2.0/3.0)
self.assertEqual(z.value, 2 ** 34)
self.assertEqual(foo.x, 6)
self.assertAlmostEqual(foo.y, 4.0)
for i in range(10):
self.assertAlmostEqual(arr[i], i*2)
self.assertEqual(string.value, latin('hellohello'))
def test_synchronize(self):
self.test_sharedctypes(lock=True)
def test_copy(self):
foo = _Foo(2, 5.0, 2 ** 33)
bar = copy(foo)
foo.x = 0
foo.y = 0
foo.z = 0
self.assertEqual(bar.x, 2)
self.assertAlmostEqual(bar.y, 5.0)
self.assertEqual(bar.z, 2 ** 33)
@unittest.skipUnless(HAS_SHMEM, "requires multiprocessing.shared_memory")
@hashlib_helper.requires_hashdigest('md5')
class _TestSharedMemory(BaseTestCase):
ALLOWED_TYPES = ('processes',)
@staticmethod
def _attach_existing_shmem_then_write(shmem_name_or_obj, binary_data):
if isinstance(shmem_name_or_obj, str):
local_sms = shared_memory.SharedMemory(shmem_name_or_obj)
else:
local_sms = shmem_name_or_obj
local_sms.buf[:len(binary_data)] = binary_data
local_sms.close()
def _new_shm_name(self, prefix):
# Add a PID to the name of a POSIX shared memory object to allow
# running multiprocessing tests (test_multiprocessing_fork,
# test_multiprocessing_spawn, etc) in parallel.
return prefix + str(os.getpid())
def test_shared_memory_basics(self):
name_tsmb = self._new_shm_name('test01_tsmb')
sms = shared_memory.SharedMemory(name_tsmb, create=True, size=512)
self.addCleanup(sms.unlink)
# Verify attributes are readable.
self.assertEqual(sms.name, name_tsmb)
self.assertGreaterEqual(sms.size, 512)
self.assertGreaterEqual(len(sms.buf), sms.size)
# Verify __repr__
self.assertIn(sms.name, str(sms))
self.assertIn(str(sms.size), str(sms))
# Modify contents of shared memory segment through memoryview.
sms.buf[0] = 42
self.assertEqual(sms.buf[0], 42)
# Attach to existing shared memory segment.
also_sms = shared_memory.SharedMemory(name_tsmb)
self.assertEqual(also_sms.buf[0], 42)
also_sms.close()
# Attach to existing shared memory segment but specify a new size.
same_sms = shared_memory.SharedMemory(name_tsmb, size=20*sms.size)
self.assertLess(same_sms.size, 20*sms.size) # Size was ignored.
same_sms.close()
# Creating Shared Memory Segment with -ve size
with self.assertRaises(ValueError):
shared_memory.SharedMemory(create=True, size=-2)
# Attaching Shared Memory Segment without a name
with self.assertRaises(ValueError):
shared_memory.SharedMemory(create=False)
# Test if shared memory segment is created properly,
# when _make_filename returns an existing shared memory segment name
with unittest.mock.patch(
'multiprocessing.shared_memory._make_filename') as mock_make_filename:
NAME_PREFIX = shared_memory._SHM_NAME_PREFIX
names = [self._new_shm_name('test01_fn'), self._new_shm_name('test02_fn')]
# Prepend NAME_PREFIX which can be '/psm_' or 'wnsm_', necessary
# because some POSIX compliant systems require name to start with /
names = [NAME_PREFIX + name for name in names]
mock_make_filename.side_effect = names
shm1 = shared_memory.SharedMemory(create=True, size=1)
self.addCleanup(shm1.unlink)
self.assertEqual(shm1._name, names[0])
mock_make_filename.side_effect = names
shm2 = shared_memory.SharedMemory(create=True, size=1)
self.addCleanup(shm2.unlink)
self.assertEqual(shm2._name, names[1])
if shared_memory._USE_POSIX:
# Posix Shared Memory can only be unlinked once. Here we
# test an implementation detail that is not observed across
# all supported platforms (since WindowsNamedSharedMemory
# manages unlinking on its own and unlink() does nothing).
# True release of shared memory segment does not necessarily
# happen until process exits, depending on the OS platform.
name_dblunlink = self._new_shm_name('test01_dblunlink')
sms_uno = shared_memory.SharedMemory(
name_dblunlink,
create=True,
size=5000
)
with self.assertRaises(FileNotFoundError):
try:
self.assertGreaterEqual(sms_uno.size, 5000)
sms_duo = shared_memory.SharedMemory(name_dblunlink)
sms_duo.unlink() # First shm_unlink() call.
sms_duo.close()
sms_uno.close()
finally:
sms_uno.unlink() # A second shm_unlink() call is bad.
with self.assertRaises(FileExistsError):
# Attempting to create a new shared memory segment with a
# name that is already in use triggers an exception.
there_can_only_be_one_sms = shared_memory.SharedMemory(
name_tsmb,
create=True,
size=512
)
if shared_memory._USE_POSIX:
# Requesting creation of a shared memory segment with the option
# to attach to an existing segment, if that name is currently in
# use, should not trigger an exception.
# Note: Using a smaller size could possibly cause truncation of
# the existing segment but is OS platform dependent. In the
# case of MacOS/darwin, requesting a smaller size is disallowed.
class OptionalAttachSharedMemory(shared_memory.SharedMemory):
_flags = os.O_CREAT | os.O_RDWR
ok_if_exists_sms = OptionalAttachSharedMemory(name_tsmb)
self.assertEqual(ok_if_exists_sms.size, sms.size)
ok_if_exists_sms.close()
# Attempting to attach to an existing shared memory segment when
# no segment exists with the supplied name triggers an exception.
with self.assertRaises(FileNotFoundError):
nonexisting_sms = shared_memory.SharedMemory('test01_notthere')
nonexisting_sms.unlink() # Error should occur on prior line.
sms.close()
def test_shared_memory_recreate(self):
# Test if shared memory segment is created properly,
# when _make_filename returns an existing shared memory segment name
with unittest.mock.patch(
'multiprocessing.shared_memory._make_filename') as mock_make_filename:
NAME_PREFIX = shared_memory._SHM_NAME_PREFIX
names = [self._new_shm_name('test03_fn'), self._new_shm_name('test04_fn')]
# Prepend NAME_PREFIX which can be '/psm_' or 'wnsm_', necessary
# because some POSIX compliant systems require name to start with /
names = [NAME_PREFIX + name for name in names]
mock_make_filename.side_effect = names
shm1 = shared_memory.SharedMemory(create=True, size=1)
self.addCleanup(shm1.unlink)
self.assertEqual(shm1._name, names[0])
mock_make_filename.side_effect = names
shm2 = shared_memory.SharedMemory(create=True, size=1)
self.addCleanup(shm2.unlink)
self.assertEqual(shm2._name, names[1])
def test_invalid_shared_memory_cration(self):
# Test creating a shared memory segment with negative size
with self.assertRaises(ValueError):
sms_invalid = shared_memory.SharedMemory(create=True, size=-1)
# Test creating a shared memory segment with size 0
with self.assertRaises(ValueError):
sms_invalid = shared_memory.SharedMemory(create=True, size=0)
# Test creating a shared memory segment without size argument
with self.assertRaises(ValueError):
sms_invalid = shared_memory.SharedMemory(create=True)
def test_shared_memory_pickle_unpickle(self):
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
with self.subTest(proto=proto):
sms = shared_memory.SharedMemory(create=True, size=512)
self.addCleanup(sms.unlink)
sms.buf[0:6] = b'pickle'
# Test pickling
pickled_sms = pickle.dumps(sms, protocol=proto)
# Test unpickling
sms2 = pickle.loads(pickled_sms)
self.assertIsInstance(sms2, shared_memory.SharedMemory)
self.assertEqual(sms.name, sms2.name)
self.assertEqual(bytes(sms.buf[0:6]), b'pickle')
self.assertEqual(bytes(sms2.buf[0:6]), b'pickle')
# Test that unpickled version is still the same SharedMemory
sms.buf[0:6] = b'newval'
self.assertEqual(bytes(sms.buf[0:6]), b'newval')
self.assertEqual(bytes(sms2.buf[0:6]), b'newval')
sms2.buf[0:6] = b'oldval'
self.assertEqual(bytes(sms.buf[0:6]), b'oldval')
self.assertEqual(bytes(sms2.buf[0:6]), b'oldval')
def test_shared_memory_pickle_unpickle_dead_object(self):
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
with self.subTest(proto=proto):
sms = shared_memory.SharedMemory(create=True, size=512)
sms.buf[0:6] = b'pickle'
pickled_sms = pickle.dumps(sms, protocol=proto)
# Now, we are going to kill the original object.
# So, unpickled one won't be able to attach to it.
sms.close()
sms.unlink()
with self.assertRaises(FileNotFoundError):
pickle.loads(pickled_sms)
def test_shared_memory_across_processes(self):
# bpo-40135: don't define shared memory block's name in case of
# the failure when we run multiprocessing tests in parallel.
sms = shared_memory.SharedMemory(create=True, size=512)
self.addCleanup(sms.unlink)
# Verify remote attachment to existing block by name is working.
p = self.Process(
target=self._attach_existing_shmem_then_write,
args=(sms.name, b'howdy')
)
p.daemon = True
p.start()
p.join()
self.assertEqual(bytes(sms.buf[:5]), b'howdy')
# Verify pickling of SharedMemory instance also works.
p = self.Process(
target=self._attach_existing_shmem_then_write,
args=(sms, b'HELLO')
)
p.daemon = True
p.start()
p.join()
self.assertEqual(bytes(sms.buf[:5]), b'HELLO')
sms.close()
@unittest.skipIf(os.name != "posix", "not feasible in non-posix platforms")
def test_shared_memory_SharedMemoryServer_ignores_sigint(self):
# bpo-36368: protect SharedMemoryManager server process from
# KeyboardInterrupt signals.
smm = multiprocessing.managers.SharedMemoryManager()
smm.start()
# make sure the manager works properly at the beginning
sl = smm.ShareableList(range(10))
# the manager's server should ignore KeyboardInterrupt signals, and
# maintain its connection with the current process, and success when
# asked to deliver memory segments.
os.kill(smm._process.pid, signal.SIGINT)
sl2 = smm.ShareableList(range(10))
# test that the custom signal handler registered in the Manager does
# not affect signal handling in the parent process.
with self.assertRaises(KeyboardInterrupt):
os.kill(os.getpid(), signal.SIGINT)
smm.shutdown()
@unittest.skipIf(os.name != "posix", "resource_tracker is posix only")
def test_shared_memory_SharedMemoryManager_reuses_resource_tracker(self):
# bpo-36867: test that a SharedMemoryManager uses the
# same resource_tracker process as its parent.
cmd = '''if 1:
from multiprocessing.managers import SharedMemoryManager
smm = SharedMemoryManager()
smm.start()
sl = smm.ShareableList(range(10))
smm.shutdown()
'''
rc, out, err = test.support.script_helper.assert_python_ok('-c', cmd)
# Before bpo-36867 was fixed, a SharedMemoryManager not using the same
# resource_tracker process as its parent would make the parent's
# tracker complain about sl being leaked even though smm.shutdown()
# properly released sl.
self.assertFalse(err)
def test_shared_memory_SharedMemoryManager_basics(self):
smm1 = multiprocessing.managers.SharedMemoryManager()
with self.assertRaises(ValueError):
smm1.SharedMemory(size=9) # Fails if SharedMemoryServer not started
smm1.start()
lol = [ smm1.ShareableList(range(i)) for i in range(5, 10) ]
lom = [ smm1.SharedMemory(size=j) for j in range(32, 128, 16) ]
doppleganger_list0 = shared_memory.ShareableList(name=lol[0].shm.name)
self.assertEqual(len(doppleganger_list0), 5)
doppleganger_shm0 = shared_memory.SharedMemory(name=lom[0].name)
self.assertGreaterEqual(len(doppleganger_shm0.buf), 32)
held_name = lom[0].name
smm1.shutdown()
if sys.platform != "win32":
# Calls to unlink() have no effect on Windows platform; shared
# memory will only be released once final process exits.
with self.assertRaises(FileNotFoundError):
# No longer there to be attached to again.
absent_shm = shared_memory.SharedMemory(name=held_name)
with multiprocessing.managers.SharedMemoryManager() as smm2:
sl = smm2.ShareableList("howdy")
shm = smm2.SharedMemory(size=128)
held_name = sl.shm.name
if sys.platform != "win32":
with self.assertRaises(FileNotFoundError):
# No longer there to be attached to again.
absent_sl = shared_memory.ShareableList(name=held_name)
def test_shared_memory_ShareableList_basics(self):
sl = shared_memory.ShareableList(
['howdy', b'HoWdY', -273.154, 100, None, True, 42]
)
self.addCleanup(sl.shm.unlink)
# Verify __repr__
self.assertIn(sl.shm.name, str(sl))
self.assertIn(str(list(sl)), str(sl))
# Index Out of Range (get)
with self.assertRaises(IndexError):
sl[7]
# Index Out of Range (set)
with self.assertRaises(IndexError):
sl[7] = 2
# Assign value without format change (str -> str)
current_format = sl._get_packing_format(0)
sl[0] = 'howdy'
self.assertEqual(current_format, sl._get_packing_format(0))
# Verify attributes are readable.
self.assertEqual(sl.format, '8s8sdqxxxxxx?xxxxxxxx?q')
# Exercise len().
self.assertEqual(len(sl), 7)
# Exercise index().
with warnings.catch_warnings():
# Suppress BytesWarning when comparing against b'HoWdY'.
warnings.simplefilter('ignore')
with self.assertRaises(ValueError):
sl.index('100')
self.assertEqual(sl.index(100), 3)
# Exercise retrieving individual values.
self.assertEqual(sl[0], 'howdy')
self.assertEqual(sl[-2], True)
# Exercise iterability.
self.assertEqual(
tuple(sl),
('howdy', b'HoWdY', -273.154, 100, None, True, 42)
)
# Exercise modifying individual values.
sl[3] = 42
self.assertEqual(sl[3], 42)
sl[4] = 'some' # Change type at a given position.
self.assertEqual(sl[4], 'some')
self.assertEqual(sl.format, '8s8sdq8sxxxxxxx?q')
with self.assertRaisesRegex(ValueError,
"exceeds available storage"):
sl[4] = 'far too many'
self.assertEqual(sl[4], 'some')
sl[0] = 'encodés' # Exactly 8 bytes of UTF-8 data
self.assertEqual(sl[0], 'encodés')
self.assertEqual(sl[1], b'HoWdY') # no spillage
with self.assertRaisesRegex(ValueError,
"exceeds available storage"):
sl[0] = 'encodées' # Exactly 9 bytes of UTF-8 data
self.assertEqual(sl[1], b'HoWdY')
with self.assertRaisesRegex(ValueError,
"exceeds available storage"):
sl[1] = b'123456789'
self.assertEqual(sl[1], b'HoWdY')
# Exercise count().
with warnings.catch_warnings():
# Suppress BytesWarning when comparing against b'HoWdY'.
warnings.simplefilter('ignore')
self.assertEqual(sl.count(42), 2)
self.assertEqual(sl.count(b'HoWdY'), 1)
self.assertEqual(sl.count(b'adios'), 0)
# Exercise creating a duplicate.
name_duplicate = self._new_shm_name('test03_duplicate')
sl_copy = shared_memory.ShareableList(sl, name=name_duplicate)
try:
self.assertNotEqual(sl.shm.name, sl_copy.shm.name)
self.assertEqual(name_duplicate, sl_copy.shm.name)
self.assertEqual(list(sl), list(sl_copy))
self.assertEqual(sl.format, sl_copy.format)
sl_copy[-1] = 77
self.assertEqual(sl_copy[-1], 77)
self.assertNotEqual(sl[-1], 77)
sl_copy.shm.close()
finally:
sl_copy.shm.unlink()
# Obtain a second handle on the same ShareableList.
sl_tethered = shared_memory.ShareableList(name=sl.shm.name)
self.assertEqual(sl.shm.name, sl_tethered.shm.name)
sl_tethered[-1] = 880
self.assertEqual(sl[-1], 880)
sl_tethered.shm.close()
sl.shm.close()
# Exercise creating an empty ShareableList.
empty_sl = shared_memory.ShareableList()
try:
self.assertEqual(len(empty_sl), 0)
self.assertEqual(empty_sl.format, '')
self.assertEqual(empty_sl.count('any'), 0)
with self.assertRaises(ValueError):
empty_sl.index(None)
empty_sl.shm.close()
finally:
empty_sl.shm.unlink()
def test_shared_memory_ShareableList_pickling(self):
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
with self.subTest(proto=proto):
sl = shared_memory.ShareableList(range(10))
self.addCleanup(sl.shm.unlink)
serialized_sl = pickle.dumps(sl, protocol=proto)
deserialized_sl = pickle.loads(serialized_sl)
self.assertIsInstance(
deserialized_sl, shared_memory.ShareableList)
self.assertEqual(deserialized_sl[-1], 9)
self.assertIsNot(sl, deserialized_sl)
deserialized_sl[4] = "changed"
self.assertEqual(sl[4], "changed")
sl[3] = "newvalue"
self.assertEqual(deserialized_sl[3], "newvalue")
larger_sl = shared_memory.ShareableList(range(400))
self.addCleanup(larger_sl.shm.unlink)
serialized_larger_sl = pickle.dumps(larger_sl, protocol=proto)
self.assertEqual(len(serialized_sl), len(serialized_larger_sl))
larger_sl.shm.close()
deserialized_sl.shm.close()
sl.shm.close()
def test_shared_memory_ShareableList_pickling_dead_object(self):
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
with self.subTest(proto=proto):
sl = shared_memory.ShareableList(range(10))
serialized_sl = pickle.dumps(sl, protocol=proto)
# Now, we are going to kill the original object.
# So, unpickled one won't be able to attach to it.
sl.shm.close()
sl.shm.unlink()
with self.assertRaises(FileNotFoundError):
pickle.loads(serialized_sl)
def test_shared_memory_cleaned_after_process_termination(self):
cmd = '''if 1:
import os, time, sys
from multiprocessing import shared_memory
# Create a shared_memory segment, and send the segment name
sm = shared_memory.SharedMemory(create=True, size=10)
sys.stdout.write(sm.name + '\\n')
sys.stdout.flush()
time.sleep(100)
'''
with subprocess.Popen([sys.executable, '-E', '-c', cmd],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE) as p:
name = p.stdout.readline().strip().decode()
# killing abruptly processes holding reference to a shared memory
# segment should not leak the given memory segment.
p.terminate()
p.wait()
err_msg = ("A SharedMemory segment was leaked after "
"a process was abruptly terminated")
for _ in support.sleeping_retry(support.LONG_TIMEOUT, err_msg):
try:
smm = shared_memory.SharedMemory(name, create=False)
except FileNotFoundError:
break
if os.name == 'posix':
# Without this line it was raising warnings like:
# UserWarning: resource_tracker:
# There appear to be 1 leaked shared_memory
# objects to clean up at shutdown
# See: https://bugs.python.org/issue45209
resource_tracker.unregister(f"/{name}", "shared_memory")
# A warning was emitted by the subprocess' own
# resource_tracker (on Windows, shared memory segments
# are released automatically by the OS).
err = p.stderr.read().decode()
self.assertIn(
"resource_tracker: There appear to be 1 leaked "
"shared_memory objects to clean up at shutdown", err)
#
# Test to verify that `Finalize` works.
#
class _TestFinalize(BaseTestCase):
ALLOWED_TYPES = ('processes',)
def setUp(self):
self.registry_backup = util._finalizer_registry.copy()
util._finalizer_registry.clear()
def tearDown(self):
gc.collect() # For PyPy or other GCs.
self.assertFalse(util._finalizer_registry)
util._finalizer_registry.update(self.registry_backup)
@classmethod
def _test_finalize(cls, conn):
class Foo(object):
pass
a = Foo()
util.Finalize(a, conn.send, args=('a',))
del a # triggers callback for a
gc.collect() # For PyPy or other GCs.
b = Foo()
close_b = util.Finalize(b, conn.send, args=('b',))
close_b() # triggers callback for b
close_b() # does nothing because callback has already been called
del b # does nothing because callback has already been called
gc.collect() # For PyPy or other GCs.
c = Foo()
util.Finalize(c, conn.send, args=('c',))
d10 = Foo()
util.Finalize(d10, conn.send, args=('d10',), exitpriority=1)
d01 = Foo()
util.Finalize(d01, conn.send, args=('d01',), exitpriority=0)
d02 = Foo()
util.Finalize(d02, conn.send, args=('d02',), exitpriority=0)
d03 = Foo()
util.Finalize(d03, conn.send, args=('d03',), exitpriority=0)
util.Finalize(None, conn.send, args=('e',), exitpriority=-10)
util.Finalize(None, conn.send, args=('STOP',), exitpriority=-100)
# call multiprocessing's cleanup function then exit process without
# garbage collecting locals
util._exit_function()
conn.close()
os._exit(0)
def test_finalize(self):
conn, child_conn = self.Pipe()
p = self.Process(target=self._test_finalize, args=(child_conn,))
p.daemon = True
p.start()
p.join()
result = [obj for obj in iter(conn.recv, 'STOP')]
self.assertEqual(result, ['a', 'b', 'd10', 'd03', 'd02', 'd01', 'e'])
def test_thread_safety(self):
# bpo-24484: _run_finalizers() should be thread-safe
def cb():
pass
class Foo(object):
def __init__(self):
self.ref = self # create reference cycle
# insert finalizer at random key
util.Finalize(self, cb, exitpriority=random.randint(1, 100))
finish = False
exc = None
def run_finalizers():
nonlocal exc
while not finish:
time.sleep(random.random() * 1e-1)
try:
# A GC run will eventually happen during this,
# collecting stale Foo's and mutating the registry
util._run_finalizers()
except Exception as e:
exc = e
def make_finalizers():
nonlocal exc
d = {}
while not finish:
try:
# Old Foo's get gradually replaced and later
# collected by the GC (because of the cyclic ref)
d[random.getrandbits(5)] = {Foo() for i in range(10)}
except Exception as e:
exc = e
d.clear()
old_interval = sys.getswitchinterval()
old_threshold = gc.get_threshold()
try:
sys.setswitchinterval(1e-6)
gc.set_threshold(5, 5, 5)
threads = [threading.Thread(target=run_finalizers),
threading.Thread(target=make_finalizers)]
with threading_helper.start_threads(threads):
time.sleep(4.0) # Wait a bit to trigger race condition
finish = True
if exc is not None:
raise exc
finally:
sys.setswitchinterval(old_interval)
gc.set_threshold(*old_threshold)
gc.collect() # Collect remaining Foo's
#
# Test that from ... import * works for each module
#
class _TestImportStar(unittest.TestCase):
def get_module_names(self):
import glob
folder = os.path.dirname(multiprocessing.__file__)
pattern = os.path.join(glob.escape(folder), '*.py')
files = glob.glob(pattern)
modules = [os.path.splitext(os.path.split(f)[1])[0] for f in files]
modules = ['multiprocessing.' + m for m in modules]
modules.remove('multiprocessing.__init__')
modules.append('multiprocessing')
return modules
def test_import(self):
modules = self.get_module_names()
if sys.platform == 'win32':
modules.remove('multiprocessing.popen_fork')
modules.remove('multiprocessing.popen_forkserver')
modules.remove('multiprocessing.popen_spawn_posix')
else:
modules.remove('multiprocessing.popen_spawn_win32')
if not HAS_REDUCTION:
modules.remove('multiprocessing.popen_forkserver')
if c_int is None:
# This module requires _ctypes
modules.remove('multiprocessing.sharedctypes')
for name in modules:
__import__(name)
mod = sys.modules[name]
self.assertTrue(hasattr(mod, '__all__'), name)
for attr in mod.__all__:
self.assertTrue(
hasattr(mod, attr),
'%r does not have attribute %r' % (mod, attr)
)
#
# Quick test that logging works -- does not test logging output
#
class _TestLogging(BaseTestCase):
ALLOWED_TYPES = ('processes',)
def test_enable_logging(self):
logger = multiprocessing.get_logger()
logger.setLevel(util.SUBWARNING)
self.assertTrue(logger is not None)
logger.debug('this will not be printed')
logger.info('nor will this')
logger.setLevel(LOG_LEVEL)
@classmethod
def _test_level(cls, conn):
logger = multiprocessing.get_logger()
conn.send(logger.getEffectiveLevel())
def test_level(self):
LEVEL1 = 32
LEVEL2 = 37
logger = multiprocessing.get_logger()
root_logger = logging.getLogger()
root_level = root_logger.level
reader, writer = multiprocessing.Pipe(duplex=False)
logger.setLevel(LEVEL1)
p = self.Process(target=self._test_level, args=(writer,))
p.start()
self.assertEqual(LEVEL1, reader.recv())
p.join()
p.close()
logger.setLevel(logging.NOTSET)
root_logger.setLevel(LEVEL2)
p = self.Process(target=self._test_level, args=(writer,))
p.start()
self.assertEqual(LEVEL2, reader.recv())
p.join()
p.close()
root_logger.setLevel(root_level)
logger.setLevel(level=LOG_LEVEL)
# class _TestLoggingProcessName(BaseTestCase):
#
# def handle(self, record):
# assert record.processName == multiprocessing.current_process().name
# self.__handled = True
#
# def test_logging(self):
# handler = logging.Handler()
# handler.handle = self.handle
# self.__handled = False
# # Bypass getLogger() and side-effects
# logger = logging.getLoggerClass()(
# 'multiprocessing.test.TestLoggingProcessName')
# logger.addHandler(handler)
# logger.propagate = False
#
# logger.warn('foo')
# assert self.__handled
#
# Check that Process.join() retries if os.waitpid() fails with EINTR
#
class _TestPollEintr(BaseTestCase):
ALLOWED_TYPES = ('processes',)
@classmethod
def _killer(cls, pid):
time.sleep(0.1)
os.kill(pid, signal.SIGUSR1)
@unittest.skipUnless(hasattr(signal, 'SIGUSR1'), 'requires SIGUSR1')
def test_poll_eintr(self):
got_signal = [False]
def record(*args):
got_signal[0] = True
pid = os.getpid()
oldhandler = signal.signal(signal.SIGUSR1, record)
try:
killer = self.Process(target=self._killer, args=(pid,))
killer.start()
try:
p = self.Process(target=time.sleep, args=(2,))
p.start()
p.join()
finally:
killer.join()
self.assertTrue(got_signal[0])
self.assertEqual(p.exitcode, 0)
finally:
signal.signal(signal.SIGUSR1, oldhandler)
#
# Test to verify handle verification, see issue 3321
#
class TestInvalidHandle(unittest.TestCase):
@unittest.skipIf(WIN32, "skipped on Windows")
def test_invalid_handles(self):
conn = multiprocessing.connection.Connection(44977608)
# check that poll() doesn't crash
try:
conn.poll()
except (ValueError, OSError):
pass
finally:
# Hack private attribute _handle to avoid printing an error
# in conn.__del__
conn._handle = None
self.assertRaises((ValueError, OSError),
multiprocessing.connection.Connection, -1)
@hashlib_helper.requires_hashdigest('md5')
class OtherTest(unittest.TestCase):
# TODO: add more tests for deliver/answer challenge.
def test_deliver_challenge_auth_failure(self):
class _FakeConnection(object):
def recv_bytes(self, size):
return b'something bogus'
def send_bytes(self, data):
pass
self.assertRaises(multiprocessing.AuthenticationError,
multiprocessing.connection.deliver_challenge,
_FakeConnection(), b'abc')
def test_answer_challenge_auth_failure(self):
class _FakeConnection(object):
def __init__(self):
self.count = 0
def recv_bytes(self, size):
self.count += 1
if self.count == 1:
return multiprocessing.connection.CHALLENGE
elif self.count == 2:
return b'something bogus'
return b''
def send_bytes(self, data):
pass
self.assertRaises(multiprocessing.AuthenticationError,
multiprocessing.connection.answer_challenge,
_FakeConnection(), b'abc')
#
# Test Manager.start()/Pool.__init__() initializer feature - see issue 5585
#
def initializer(ns):
ns.test += 1
@hashlib_helper.requires_hashdigest('md5')
class TestInitializers(unittest.TestCase):
def setUp(self):
self.mgr = multiprocessing.Manager()
self.ns = self.mgr.Namespace()
self.ns.test = 0
def tearDown(self):
self.mgr.shutdown()
self.mgr.join()
def test_manager_initializer(self):
m = multiprocessing.managers.SyncManager()
self.assertRaises(TypeError, m.start, 1)
m.start(initializer, (self.ns,))
self.assertEqual(self.ns.test, 1)
m.shutdown()
m.join()
def test_pool_initializer(self):
self.assertRaises(TypeError, multiprocessing.Pool, initializer=1)
p = multiprocessing.Pool(1, initializer, (self.ns,))
p.close()
p.join()
self.assertEqual(self.ns.test, 1)
#
# Issue 5155, 5313, 5331: Test process in processes
# Verifies os.close(sys.stdin.fileno) vs. sys.stdin.close() behavior
#
def _this_sub_process(q):
try:
item = q.get(block=False)
except pyqueue.Empty:
pass
def _test_process():
queue = multiprocessing.Queue()
subProc = multiprocessing.Process(target=_this_sub_process, args=(queue,))
subProc.daemon = True
subProc.start()
subProc.join()
def _afunc(x):
return x*x
def pool_in_process():
pool = multiprocessing.Pool(processes=4)
x = pool.map(_afunc, [1, 2, 3, 4, 5, 6, 7])
pool.close()
pool.join()
class _file_like(object):
def __init__(self, delegate):
self._delegate = delegate
self._pid = None
@property
def cache(self):
pid = os.getpid()
# There are no race conditions since fork keeps only the running thread
if pid != self._pid:
self._pid = pid
self._cache = []
return self._cache
def write(self, data):
self.cache.append(data)
def flush(self):
self._delegate.write(''.join(self.cache))
self._cache = []
class TestStdinBadfiledescriptor(unittest.TestCase):
def test_queue_in_process(self):
proc = multiprocessing.Process(target=_test_process)
proc.start()
proc.join()
def test_pool_in_process(self):
p = multiprocessing.Process(target=pool_in_process)
p.start()
p.join()
def test_flushing(self):
sio = io.StringIO()
flike = _file_like(sio)
flike.write('foo')
proc = multiprocessing.Process(target=lambda: flike.flush())
flike.flush()
assert sio.getvalue() == 'foo'
class TestWait(unittest.TestCase):
@classmethod
def _child_test_wait(cls, w, slow):
for i in range(10):
if slow:
time.sleep(random.random()*0.1)
w.send((i, os.getpid()))
w.close()
def test_wait(self, slow=False):
from multiprocessing.connection import wait
readers = []
procs = []
messages = []
for i in range(4):
r, w = multiprocessing.Pipe(duplex=False)
p = multiprocessing.Process(target=self._child_test_wait, args=(w, slow))
p.daemon = True
p.start()
w.close()
readers.append(r)
procs.append(p)
self.addCleanup(p.join)
while readers:
for r in wait(readers):
try:
msg = r.recv()
except EOFError:
readers.remove(r)
r.close()
else:
messages.append(msg)
messages.sort()
expected = sorted((i, p.pid) for i in range(10) for p in procs)
self.assertEqual(messages, expected)
@classmethod
def _child_test_wait_socket(cls, address, slow):
s = socket.socket()
s.connect(address)
for i in range(10):
if slow:
time.sleep(random.random()*0.1)
s.sendall(('%s\n' % i).encode('ascii'))
s.close()
def test_wait_socket(self, slow=False):
from multiprocessing.connection import wait
l = socket.create_server((socket_helper.HOST, 0))
addr = l.getsockname()
readers = []
procs = []
dic = {}
for i in range(4):
p = multiprocessing.Process(target=self._child_test_wait_socket,
args=(addr, slow))
p.daemon = True
p.start()
procs.append(p)
self.addCleanup(p.join)
for i in range(4):
r, _ = l.accept()
readers.append(r)
dic[r] = []
l.close()
while readers:
for r in wait(readers):
msg = r.recv(32)
if not msg:
readers.remove(r)
r.close()
else:
dic[r].append(msg)
expected = ''.join('%s\n' % i for i in range(10)).encode('ascii')
for v in dic.values():
self.assertEqual(b''.join(v), expected)
def test_wait_slow(self):
self.test_wait(True)
def test_wait_socket_slow(self):
self.test_wait_socket(True)
def test_wait_timeout(self):
from multiprocessing.connection import wait
expected = 5
a, b = multiprocessing.Pipe()
start = time.monotonic()
res = wait([a, b], expected)
delta = time.monotonic() - start
self.assertEqual(res, [])
self.assertLess(delta, expected * 2)
self.assertGreater(delta, expected * 0.5)
b.send(None)
start = time.monotonic()
res = wait([a, b], 20)
delta = time.monotonic() - start
self.assertEqual(res, [a])
self.assertLess(delta, 0.4)
@classmethod
def signal_and_sleep(cls, sem, period):
sem.release()
time.sleep(period)
def test_wait_integer(self):
from multiprocessing.connection import wait
expected = 3
sorted_ = lambda l: sorted(l, key=lambda x: id(x))
sem = multiprocessing.Semaphore(0)
a, b = multiprocessing.Pipe()
p = multiprocessing.Process(target=self.signal_and_sleep,
args=(sem, expected))
p.start()
self.assertIsInstance(p.sentinel, int)
self.assertTrue(sem.acquire(timeout=20))
start = time.monotonic()
res = wait([a, p.sentinel, b], expected + 20)
delta = time.monotonic() - start
self.assertEqual(res, [p.sentinel])
self.assertLess(delta, expected + 2)
self.assertGreater(delta, expected - 2)
a.send(None)
start = time.monotonic()
res = wait([a, p.sentinel, b], 20)
delta = time.monotonic() - start
self.assertEqual(sorted_(res), sorted_([p.sentinel, b]))
self.assertLess(delta, 0.4)
b.send(None)
start = time.monotonic()
res = wait([a, p.sentinel, b], 20)
delta = time.monotonic() - start
self.assertEqual(sorted_(res), sorted_([a, p.sentinel, b]))
self.assertLess(delta, 0.4)
p.terminate()
p.join()
def test_neg_timeout(self):
from multiprocessing.connection import wait
a, b = multiprocessing.Pipe()
t = time.monotonic()
res = wait([a], timeout=-1)
t = time.monotonic() - t
self.assertEqual(res, [])
self.assertLess(t, 1)
a.close()
b.close()
#
# Issue 14151: Test invalid family on invalid environment
#
class TestInvalidFamily(unittest.TestCase):
@unittest.skipIf(WIN32, "skipped on Windows")
def test_invalid_family(self):
with self.assertRaises(ValueError):
multiprocessing.connection.Listener(r'\\.\test')
@unittest.skipUnless(WIN32, "skipped on non-Windows platforms")
def test_invalid_family_win32(self):
with self.assertRaises(ValueError):
multiprocessing.connection.Listener('/var/test.pipe')
#
# Issue 12098: check sys.flags of child matches that for parent
#
class TestFlags(unittest.TestCase):
@classmethod
def run_in_grandchild(cls, conn):
conn.send(tuple(sys.flags))
@classmethod
def run_in_child(cls):
import json
r, w = multiprocessing.Pipe(duplex=False)
p = multiprocessing.Process(target=cls.run_in_grandchild, args=(w,))
p.start()
grandchild_flags = r.recv()
p.join()
r.close()
w.close()
flags = (tuple(sys.flags), grandchild_flags)
print(json.dumps(flags))
def test_flags(self):
import json
# start child process using unusual flags
prog = ('from test._test_multiprocessing import TestFlags; ' +
'TestFlags.run_in_child()')
data = subprocess.check_output(
[sys.executable, '-E', '-S', '-O', '-c', prog])
child_flags, grandchild_flags = json.loads(data.decode('ascii'))
self.assertEqual(child_flags, grandchild_flags)
#
# Test interaction with socket timeouts - see Issue #6056
#
class TestTimeouts(unittest.TestCase):
@classmethod
def _test_timeout(cls, child, address):
time.sleep(1)
child.send(123)
child.close()
conn = multiprocessing.connection.Client(address)
conn.send(456)
conn.close()
def test_timeout(self):
old_timeout = socket.getdefaulttimeout()
try:
socket.setdefaulttimeout(0.1)
parent, child = multiprocessing.Pipe(duplex=True)
l = multiprocessing.connection.Listener(family='AF_INET')
p = multiprocessing.Process(target=self._test_timeout,
args=(child, l.address))
p.start()
child.close()
self.assertEqual(parent.recv(), 123)
parent.close()
conn = l.accept()
self.assertEqual(conn.recv(), 456)
conn.close()
l.close()
join_process(p)
finally:
socket.setdefaulttimeout(old_timeout)
#
# Test what happens with no "if __name__ == '__main__'"
#
class TestNoForkBomb(unittest.TestCase):
def test_noforkbomb(self):
sm = multiprocessing.get_start_method()
name = os.path.join(os.path.dirname(__file__), 'mp_fork_bomb.py')
if sm != 'fork':
rc, out, err = test.support.script_helper.assert_python_failure(name, sm)
self.assertEqual(out, b'')
self.assertIn(b'RuntimeError', err)
else:
rc, out, err = test.support.script_helper.assert_python_ok(name, sm)
self.assertEqual(out.rstrip(), b'123')
self.assertEqual(err, b'')
#
# Issue #17555: ForkAwareThreadLock
#
class TestForkAwareThreadLock(unittest.TestCase):
# We recursively start processes. Issue #17555 meant that the
# after fork registry would get duplicate entries for the same
# lock. The size of the registry at generation n was ~2**n.
@classmethod
def child(cls, n, conn):
if n > 1:
p = multiprocessing.Process(target=cls.child, args=(n-1, conn))
p.start()
conn.close()
join_process(p)
else:
conn.send(len(util._afterfork_registry))
conn.close()
def test_lock(self):
r, w = multiprocessing.Pipe(False)
l = util.ForkAwareThreadLock()
old_size = len(util._afterfork_registry)
p = multiprocessing.Process(target=self.child, args=(5, w))
p.start()
w.close()
new_size = r.recv()
join_process(p)
self.assertLessEqual(new_size, old_size)
#
# Check that non-forked child processes do not inherit unneeded fds/handles
#
class TestCloseFds(unittest.TestCase):
def get_high_socket_fd(self):
if WIN32:
# The child process will not have any socket handles, so
# calling socket.fromfd() should produce WSAENOTSOCK even
# if there is a handle of the same number.
return socket.socket().detach()
else:
# We want to produce a socket with an fd high enough that a
# freshly created child process will not have any fds as high.
fd = socket.socket().detach()
to_close = []
while fd < 50:
to_close.append(fd)
fd = os.dup(fd)
for x in to_close:
os.close(x)
return fd
def close(self, fd):
if WIN32:
socket.socket(socket.AF_INET, socket.SOCK_STREAM, fileno=fd).close()
else:
os.close(fd)
@classmethod
def _test_closefds(cls, conn, fd):
try:
s = socket.fromfd(fd, socket.AF_INET, socket.SOCK_STREAM)
except Exception as e:
conn.send(e)
else:
s.close()
conn.send(None)
def test_closefd(self):
if not HAS_REDUCTION:
raise unittest.SkipTest('requires fd pickling')
reader, writer = multiprocessing.Pipe()
fd = self.get_high_socket_fd()
try:
p = multiprocessing.Process(target=self._test_closefds,
args=(writer, fd))
p.start()
writer.close()
e = reader.recv()
join_process(p)
finally:
self.close(fd)
writer.close()
reader.close()
if multiprocessing.get_start_method() == 'fork':
self.assertIs(e, None)
else:
WSAENOTSOCK = 10038
self.assertIsInstance(e, OSError)
self.assertTrue(e.errno == errno.EBADF or
e.winerror == WSAENOTSOCK, e)
#
# Issue #17097: EINTR should be ignored by recv(), send(), accept() etc
#
class TestIgnoreEINTR(unittest.TestCase):
# Sending CONN_MAX_SIZE bytes into a multiprocessing pipe must block
CONN_MAX_SIZE = max(support.PIPE_MAX_SIZE, support.SOCK_MAX_SIZE)
@classmethod
def _test_ignore(cls, conn):
def handler(signum, frame):
pass
signal.signal(signal.SIGUSR1, handler)
conn.send('ready')
x = conn.recv()
conn.send(x)
conn.send_bytes(b'x' * cls.CONN_MAX_SIZE)
@unittest.skipUnless(hasattr(signal, 'SIGUSR1'), 'requires SIGUSR1')
def test_ignore(self):
conn, child_conn = multiprocessing.Pipe()
try:
p = multiprocessing.Process(target=self._test_ignore,
args=(child_conn,))
p.daemon = True
p.start()
child_conn.close()
self.assertEqual(conn.recv(), 'ready')
time.sleep(0.1)
os.kill(p.pid, signal.SIGUSR1)
time.sleep(0.1)
conn.send(1234)
self.assertEqual(conn.recv(), 1234)
time.sleep(0.1)
os.kill(p.pid, signal.SIGUSR1)
self.assertEqual(conn.recv_bytes(), b'x' * self.CONN_MAX_SIZE)
time.sleep(0.1)
p.join()
finally:
conn.close()
@classmethod
def _test_ignore_listener(cls, conn):
def handler(signum, frame):
pass
signal.signal(signal.SIGUSR1, handler)
with multiprocessing.connection.Listener() as l:
conn.send(l.address)
a = l.accept()
a.send('welcome')
@unittest.skipUnless(hasattr(signal, 'SIGUSR1'), 'requires SIGUSR1')
def test_ignore_listener(self):
conn, child_conn = multiprocessing.Pipe()
try:
p = multiprocessing.Process(target=self._test_ignore_listener,
args=(child_conn,))
p.daemon = True
p.start()
child_conn.close()
address = conn.recv()
time.sleep(0.1)
os.kill(p.pid, signal.SIGUSR1)
time.sleep(0.1)
client = multiprocessing.connection.Client(address)
self.assertEqual(client.recv(), 'welcome')
p.join()
finally:
conn.close()
class TestStartMethod(unittest.TestCase):
@classmethod
def _check_context(cls, conn):
conn.send(multiprocessing.get_start_method())
def check_context(self, ctx):
r, w = ctx.Pipe(duplex=False)
p = ctx.Process(target=self._check_context, args=(w,))
p.start()
w.close()
child_method = r.recv()
r.close()
p.join()
self.assertEqual(child_method, ctx.get_start_method())
def test_context(self):
for method in ('fork', 'spawn', 'forkserver'):
try:
ctx = multiprocessing.get_context(method)
except ValueError:
continue
self.assertEqual(ctx.get_start_method(), method)
self.assertIs(ctx.get_context(), ctx)
self.assertRaises(ValueError, ctx.set_start_method, 'spawn')
self.assertRaises(ValueError, ctx.set_start_method, None)
self.check_context(ctx)
def test_set_get(self):
multiprocessing.set_forkserver_preload(PRELOAD)
count = 0
old_method = multiprocessing.get_start_method()
try:
for method in ('fork', 'spawn', 'forkserver'):
try:
multiprocessing.set_start_method(method, force=True)
except ValueError:
continue
self.assertEqual(multiprocessing.get_start_method(), method)
ctx = multiprocessing.get_context()
self.assertEqual(ctx.get_start_method(), method)
self.assertTrue(type(ctx).__name__.lower().startswith(method))
self.assertTrue(
ctx.Process.__name__.lower().startswith(method))
self.check_context(multiprocessing)
count += 1
finally:
multiprocessing.set_start_method(old_method, force=True)
self.assertGreaterEqual(count, 1)
def test_get_all(self):
methods = multiprocessing.get_all_start_methods()
if sys.platform == 'win32':
self.assertEqual(methods, ['spawn'])
else:
self.assertTrue(methods == ['fork', 'spawn'] or
methods == ['spawn', 'fork'] or
methods == ['fork', 'spawn', 'forkserver'] or
methods == ['spawn', 'fork', 'forkserver'])
def test_preload_resources(self):
if multiprocessing.get_start_method() != 'forkserver':
self.skipTest("test only relevant for 'forkserver' method")
name = os.path.join(os.path.dirname(__file__), 'mp_preload.py')
rc, out, err = test.support.script_helper.assert_python_ok(name)
out = out.decode()
err = err.decode()
if out.rstrip() != 'ok' or err != '':
print(out)
print(err)
self.fail("failed spawning forkserver or grandchild")
@unittest.skipIf(sys.platform == "win32",
"test semantics don't make sense on Windows")
class TestResourceTracker(unittest.TestCase):
def test_resource_tracker(self):
#
# Check that killing process does not leak named semaphores
#
cmd = '''if 1:
import time, os
import multiprocessing as mp
from multiprocessing import resource_tracker
from multiprocessing.shared_memory import SharedMemory
mp.set_start_method("spawn")
def create_and_register_resource(rtype):
if rtype == "semaphore":
lock = mp.Lock()
return lock, lock._semlock.name
elif rtype == "shared_memory":
sm = SharedMemory(create=True, size=10)
return sm, sm._name
else:
raise ValueError(
"Resource type {{}} not understood".format(rtype))
resource1, rname1 = create_and_register_resource("{rtype}")
resource2, rname2 = create_and_register_resource("{rtype}")
os.write({w}, rname1.encode("ascii") + b"\\n")
os.write({w}, rname2.encode("ascii") + b"\\n")
time.sleep(10)
'''
for rtype in resource_tracker._CLEANUP_FUNCS:
with self.subTest(rtype=rtype):
if rtype == "noop":
# Artefact resource type used by the resource_tracker
continue
r, w = os.pipe()
p = subprocess.Popen([sys.executable,
'-E', '-c', cmd.format(w=w, rtype=rtype)],
pass_fds=[w],
stderr=subprocess.PIPE)
os.close(w)
with open(r, 'rb', closefd=True) as f:
name1 = f.readline().rstrip().decode('ascii')
name2 = f.readline().rstrip().decode('ascii')
_resource_unlink(name1, rtype)
p.terminate()
p.wait()
err_msg = (f"A {rtype} resource was leaked after a process was "
f"abruptly terminated")
for _ in support.sleeping_retry(support.SHORT_TIMEOUT,
err_msg):
try:
_resource_unlink(name2, rtype)
except OSError as e:
# docs say it should be ENOENT, but OSX seems to give
# EINVAL
self.assertIn(e.errno, (errno.ENOENT, errno.EINVAL))
break
err = p.stderr.read().decode('utf-8')
p.stderr.close()
expected = ('resource_tracker: There appear to be 2 leaked {} '
'objects'.format(
rtype))
self.assertRegex(err, expected)
self.assertRegex(err, r'resource_tracker: %r: \[Errno' % name1)
def check_resource_tracker_death(self, signum, should_die):
# bpo-31310: if the semaphore tracker process has died, it should
# be restarted implicitly.
from multiprocessing.resource_tracker import _resource_tracker
pid = _resource_tracker._pid
if pid is not None:
os.kill(pid, signal.SIGKILL)
support.wait_process(pid, exitcode=-signal.SIGKILL)
with warnings.catch_warnings():
warnings.simplefilter("ignore")
_resource_tracker.ensure_running()
pid = _resource_tracker._pid
os.kill(pid, signum)
time.sleep(1.0) # give it time to die
ctx = multiprocessing.get_context("spawn")
with warnings.catch_warnings(record=True) as all_warn:
warnings.simplefilter("always")
sem = ctx.Semaphore()
sem.acquire()
sem.release()
wr = weakref.ref(sem)
# ensure `sem` gets collected, which triggers communication with
# the semaphore tracker
del sem
gc.collect()
self.assertIsNone(wr())
if should_die:
self.assertEqual(len(all_warn), 1)
the_warn = all_warn[0]
self.assertTrue(issubclass(the_warn.category, UserWarning))
self.assertTrue("resource_tracker: process died"
in str(the_warn.message))
else:
self.assertEqual(len(all_warn), 0)
def test_resource_tracker_sigint(self):
# Catchable signal (ignored by semaphore tracker)
self.check_resource_tracker_death(signal.SIGINT, False)
def test_resource_tracker_sigterm(self):
# Catchable signal (ignored by semaphore tracker)
self.check_resource_tracker_death(signal.SIGTERM, False)
def test_resource_tracker_sigkill(self):
# Uncatchable signal.
self.check_resource_tracker_death(signal.SIGKILL, True)
@staticmethod
def _is_resource_tracker_reused(conn, pid):
from multiprocessing.resource_tracker import _resource_tracker
_resource_tracker.ensure_running()
# The pid should be None in the child process, expect for the fork
# context. It should not be a new value.
reused = _resource_tracker._pid in (None, pid)
reused &= _resource_tracker._check_alive()
conn.send(reused)
def test_resource_tracker_reused(self):
from multiprocessing.resource_tracker import _resource_tracker
_resource_tracker.ensure_running()
pid = _resource_tracker._pid
r, w = multiprocessing.Pipe(duplex=False)
p = multiprocessing.Process(target=self._is_resource_tracker_reused,
args=(w, pid))
p.start()
is_resource_tracker_reused = r.recv()
# Clean up
p.join()
w.close()
r.close()
self.assertTrue(is_resource_tracker_reused)
def test_too_long_name_resource(self):
# gh-96819: Resource names that will make the length of a write to a pipe
# greater than PIPE_BUF are not allowed
rtype = "shared_memory"
too_long_name_resource = "a" * (512 - len(rtype))
with self.assertRaises(ValueError):
resource_tracker.register(too_long_name_resource, rtype)
class TestSimpleQueue(unittest.TestCase):
@classmethod
def _test_empty(cls, queue, child_can_start, parent_can_continue):
child_can_start.wait()
# issue 30301, could fail under spawn and forkserver
try:
queue.put(queue.empty())
queue.put(queue.empty())
finally:
parent_can_continue.set()
def test_empty(self):
queue = multiprocessing.SimpleQueue()
child_can_start = multiprocessing.Event()
parent_can_continue = multiprocessing.Event()
proc = multiprocessing.Process(
target=self._test_empty,
args=(queue, child_can_start, parent_can_continue)
)
proc.daemon = True
proc.start()
self.assertTrue(queue.empty())
child_can_start.set()
parent_can_continue.wait()
self.assertFalse(queue.empty())
self.assertEqual(queue.get(), True)
self.assertEqual(queue.get(), False)
self.assertTrue(queue.empty())
proc.join()
def test_close(self):
queue = multiprocessing.SimpleQueue()
queue.close()
# closing a queue twice should not fail
queue.close()
# Test specific to CPython since it tests private attributes
@test.support.cpython_only
def test_closed(self):
queue = multiprocessing.SimpleQueue()
queue.close()
self.assertTrue(queue._reader.closed)
self.assertTrue(queue._writer.closed)
class TestPoolNotLeakOnFailure(unittest.TestCase):
def test_release_unused_processes(self):
# Issue #19675: During pool creation, if we can't create a process,
# don't leak already created ones.
will_fail_in = 3
forked_processes = []
class FailingForkProcess:
def __init__(self, **kwargs):
self.name = 'Fake Process'
self.exitcode = None
self.state = None
forked_processes.append(self)
def start(self):
nonlocal will_fail_in
if will_fail_in <= 0:
raise OSError("Manually induced OSError")
will_fail_in -= 1
self.state = 'started'
def terminate(self):
self.state = 'stopping'
def join(self):
if self.state == 'stopping':
self.state = 'stopped'
def is_alive(self):
return self.state == 'started' or self.state == 'stopping'
with self.assertRaisesRegex(OSError, 'Manually induced OSError'):
p = multiprocessing.pool.Pool(5, context=unittest.mock.MagicMock(
Process=FailingForkProcess))
p.close()
p.join()
self.assertFalse(
any(process.is_alive() for process in forked_processes))
@hashlib_helper.requires_hashdigest('md5')
class TestSyncManagerTypes(unittest.TestCase):
"""Test all the types which can be shared between a parent and a
child process by using a manager which acts as an intermediary
between them.
In the following unit-tests the base type is created in the parent
process, the @classmethod represents the worker process and the
shared object is readable and editable between the two.
# The child.
@classmethod
def _test_list(cls, obj):
assert obj[0] == 5
assert obj.append(6)
# The parent.
def test_list(self):
o = self.manager.list()
o.append(5)
self.run_worker(self._test_list, o)
assert o[1] == 6
"""
manager_class = multiprocessing.managers.SyncManager
def setUp(self):
self.manager = self.manager_class()
self.manager.start()
self.proc = None
def tearDown(self):
if self.proc is not None and self.proc.is_alive():
self.proc.terminate()
self.proc.join()
self.manager.shutdown()
self.manager = None
self.proc = None
@classmethod
def setUpClass(cls):
support.reap_children()
tearDownClass = setUpClass
def wait_proc_exit(self):
# Only the manager process should be returned by active_children()
# but this can take a bit on slow machines, so wait a few seconds
# if there are other children too (see #17395).
join_process(self.proc)
timeout = WAIT_ACTIVE_CHILDREN_TIMEOUT
start_time = time.monotonic()
for _ in support.sleeping_retry(timeout, error=False):
if len(multiprocessing.active_children()) <= 1:
break
else:
dt = time.monotonic() - start_time
support.environment_altered = True
support.print_warning(f"multiprocessing.Manager still has "
f"{multiprocessing.active_children()} "
f"active children after {dt:.1f} seconds")
def run_worker(self, worker, obj):
self.proc = multiprocessing.Process(target=worker, args=(obj, ))
self.proc.daemon = True
self.proc.start()
self.wait_proc_exit()
self.assertEqual(self.proc.exitcode, 0)
@classmethod
def _test_event(cls, obj):
assert obj.is_set()
obj.wait()
obj.clear()
obj.wait(0.001)
def test_event(self):
o = self.manager.Event()
o.set()
self.run_worker(self._test_event, o)
assert not o.is_set()
o.wait(0.001)
@classmethod
def _test_lock(cls, obj):
obj.acquire()
def test_lock(self, lname="Lock"):
o = getattr(self.manager, lname)()
self.run_worker(self._test_lock, o)
o.release()
self.assertRaises(RuntimeError, o.release) # already released
@classmethod
def _test_rlock(cls, obj):
obj.acquire()
obj.release()
def test_rlock(self, lname="Lock"):
o = getattr(self.manager, lname)()
self.run_worker(self._test_rlock, o)
@classmethod
def _test_semaphore(cls, obj):
obj.acquire()
def test_semaphore(self, sname="Semaphore"):
o = getattr(self.manager, sname)()
self.run_worker(self._test_semaphore, o)
o.release()
def test_bounded_semaphore(self):
self.test_semaphore(sname="BoundedSemaphore")
@classmethod
def _test_condition(cls, obj):
obj.acquire()
obj.release()
def test_condition(self):
o = self.manager.Condition()
self.run_worker(self._test_condition, o)
@classmethod
def _test_barrier(cls, obj):
assert obj.parties == 5
obj.reset()
def test_barrier(self):
o = self.manager.Barrier(5)
self.run_worker(self._test_barrier, o)
@classmethod
def _test_pool(cls, obj):
# TODO: fix https://bugs.python.org/issue35919
with obj:
pass
def test_pool(self):
o = self.manager.Pool(processes=4)
self.run_worker(self._test_pool, o)
@classmethod
def _test_queue(cls, obj):
assert obj.qsize() == 2
assert obj.full()
assert not obj.empty()
assert obj.get() == 5
assert not obj.empty()
assert obj.get() == 6
assert obj.empty()
def test_queue(self, qname="Queue"):
o = getattr(self.manager, qname)(2)
o.put(5)
o.put(6)
self.run_worker(self._test_queue, o)
assert o.empty()
assert not o.full()
def test_joinable_queue(self):
self.test_queue("JoinableQueue")
@classmethod
def _test_list(cls, obj):
case = unittest.TestCase()
case.assertEqual(obj[0], 5)
case.assertEqual(obj.count(5), 1)
case.assertEqual(obj.index(5), 0)
obj.sort()
obj.reverse()
for x in obj:
pass
case.assertEqual(len(obj), 1)
case.assertEqual(obj.pop(0), 5)
def test_list(self):
o = self.manager.list()
o.append(5)
self.run_worker(self._test_list, o)
self.assertIsNotNone(o)
self.assertEqual(len(o), 0)
@classmethod
def _test_dict(cls, obj):
case = unittest.TestCase()
case.assertEqual(len(obj), 1)
case.assertEqual(obj['foo'], 5)
case.assertEqual(obj.get('foo'), 5)
case.assertListEqual(list(obj.items()), [('foo', 5)])
case.assertListEqual(list(obj.keys()), ['foo'])
case.assertListEqual(list(obj.values()), [5])
case.assertDictEqual(obj.copy(), {'foo': 5})
case.assertTupleEqual(obj.popitem(), ('foo', 5))
def test_dict(self):
o = self.manager.dict()
o['foo'] = 5
self.run_worker(self._test_dict, o)
self.assertIsNotNone(o)
self.assertEqual(len(o), 0)
@classmethod
def _test_value(cls, obj):
case = unittest.TestCase()
case.assertEqual(obj.value, 1)
case.assertEqual(obj.get(), 1)
obj.set(2)
def test_value(self):
o = self.manager.Value('i', 1)
self.run_worker(self._test_value, o)
self.assertEqual(o.value, 2)
self.assertEqual(o.get(), 2)
@classmethod
def _test_array(cls, obj):
case = unittest.TestCase()
case.assertEqual(obj[0], 0)
case.assertEqual(obj[1], 1)
case.assertEqual(len(obj), 2)
case.assertListEqual(list(obj), [0, 1])
def test_array(self):
o = self.manager.Array('i', [0, 1])
self.run_worker(self._test_array, o)
@classmethod
def _test_namespace(cls, obj):
case = unittest.TestCase()
case.assertEqual(obj.x, 0)
case.assertEqual(obj.y, 1)
def test_namespace(self):
o = self.manager.Namespace()
o.x = 0
o.y = 1
self.run_worker(self._test_namespace, o)
class TestNamedResource(unittest.TestCase):
def test_global_named_resource_spawn(self):
#
# gh-90549: Check that global named resources in main module
# will not leak by a subprocess, in spawn context.
#
testfn = os_helper.TESTFN
self.addCleanup(os_helper.unlink, testfn)
with open(testfn, 'w', encoding='utf-8') as f:
f.write(textwrap.dedent('''\
import multiprocessing as mp
ctx = mp.get_context('spawn')
global_resource = ctx.Semaphore()
def submain(): pass
if __name__ == '__main__':
p = ctx.Process(target=submain)
p.start()
p.join()
'''))
rc, out, err = test.support.script_helper.assert_python_ok(testfn)
# on error, err = 'UserWarning: resource_tracker: There appear to
# be 1 leaked semaphore objects to clean up at shutdown'
self.assertEqual(err, b'')
class MiscTestCase(unittest.TestCase):
def test__all__(self):
# Just make sure names in not_exported are excluded
support.check__all__(self, multiprocessing, extra=multiprocessing.__all__,
not_exported=['SUBDEBUG', 'SUBWARNING'])
#
# Mixins
#
class BaseMixin(object):
@classmethod
def setUpClass(cls):
cls.dangling = (multiprocessing.process._dangling.copy(),
threading._dangling.copy())
@classmethod
def tearDownClass(cls):
# bpo-26762: Some multiprocessing objects like Pool create reference
# cycles. Trigger a garbage collection to break these cycles.
test.support.gc_collect()
processes = set(multiprocessing.process._dangling) - set(cls.dangling[0])
if processes:
test.support.environment_altered = True
support.print_warning(f'Dangling processes: {processes}')
processes = None
threads = set(threading._dangling) - set(cls.dangling[1])
if threads:
test.support.environment_altered = True
support.print_warning(f'Dangling threads: {threads}')
threads = None
class ProcessesMixin(BaseMixin):
TYPE = 'processes'
Process = multiprocessing.Process
connection = multiprocessing.connection
current_process = staticmethod(multiprocessing.current_process)
parent_process = staticmethod(multiprocessing.parent_process)
active_children = staticmethod(multiprocessing.active_children)
set_executable = staticmethod(multiprocessing.set_executable)
Pool = staticmethod(multiprocessing.Pool)
Pipe = staticmethod(multiprocessing.Pipe)
Queue = staticmethod(multiprocessing.Queue)
JoinableQueue = staticmethod(multiprocessing.JoinableQueue)
Lock = staticmethod(multiprocessing.Lock)
RLock = staticmethod(multiprocessing.RLock)
Semaphore = staticmethod(multiprocessing.Semaphore)
BoundedSemaphore = staticmethod(multiprocessing.BoundedSemaphore)
Condition = staticmethod(multiprocessing.Condition)
Event = staticmethod(multiprocessing.Event)
Barrier = staticmethod(multiprocessing.Barrier)
Value = staticmethod(multiprocessing.Value)
Array = staticmethod(multiprocessing.Array)
RawValue = staticmethod(multiprocessing.RawValue)
RawArray = staticmethod(multiprocessing.RawArray)
class ManagerMixin(BaseMixin):
TYPE = 'manager'
Process = multiprocessing.Process
Queue = property(operator.attrgetter('manager.Queue'))
JoinableQueue = property(operator.attrgetter('manager.JoinableQueue'))
Lock = property(operator.attrgetter('manager.Lock'))
RLock = property(operator.attrgetter('manager.RLock'))
Semaphore = property(operator.attrgetter('manager.Semaphore'))
BoundedSemaphore = property(operator.attrgetter('manager.BoundedSemaphore'))
Condition = property(operator.attrgetter('manager.Condition'))
Event = property(operator.attrgetter('manager.Event'))
Barrier = property(operator.attrgetter('manager.Barrier'))
Value = property(operator.attrgetter('manager.Value'))
Array = property(operator.attrgetter('manager.Array'))
list = property(operator.attrgetter('manager.list'))
dict = property(operator.attrgetter('manager.dict'))
Namespace = property(operator.attrgetter('manager.Namespace'))
@classmethod
def Pool(cls, *args, **kwds):
return cls.manager.Pool(*args, **kwds)
@classmethod
def setUpClass(cls):
super().setUpClass()
cls.manager = multiprocessing.Manager()
@classmethod
def tearDownClass(cls):
# only the manager process should be returned by active_children()
# but this can take a bit on slow machines, so wait a few seconds
# if there are other children too (see #17395)
timeout = WAIT_ACTIVE_CHILDREN_TIMEOUT
start_time = time.monotonic()
for _ in support.sleeping_retry(timeout, error=False):
if len(multiprocessing.active_children()) <= 1:
break
else:
dt = time.monotonic() - start_time
support.environment_altered = True
support.print_warning(f"multiprocessing.Manager still has "
f"{multiprocessing.active_children()} "
f"active children after {dt:.1f} seconds")
gc.collect() # do garbage collection
if cls.manager._number_of_objects() != 0:
# This is not really an error since some tests do not
# ensure that all processes which hold a reference to a
# managed object have been joined.
test.support.environment_altered = True
support.print_warning('Shared objects which still exist '
'at manager shutdown:')
support.print_warning(cls.manager._debug_info())
cls.manager.shutdown()
cls.manager.join()
cls.manager = None
super().tearDownClass()
class ThreadsMixin(BaseMixin):
TYPE = 'threads'
Process = multiprocessing.dummy.Process
connection = multiprocessing.dummy.connection
current_process = staticmethod(multiprocessing.dummy.current_process)
active_children = staticmethod(multiprocessing.dummy.active_children)
Pool = staticmethod(multiprocessing.dummy.Pool)
Pipe = staticmethod(multiprocessing.dummy.Pipe)
Queue = staticmethod(multiprocessing.dummy.Queue)
JoinableQueue = staticmethod(multiprocessing.dummy.JoinableQueue)
Lock = staticmethod(multiprocessing.dummy.Lock)
RLock = staticmethod(multiprocessing.dummy.RLock)
Semaphore = staticmethod(multiprocessing.dummy.Semaphore)
BoundedSemaphore = staticmethod(multiprocessing.dummy.BoundedSemaphore)
Condition = staticmethod(multiprocessing.dummy.Condition)
Event = staticmethod(multiprocessing.dummy.Event)
Barrier = staticmethod(multiprocessing.dummy.Barrier)
Value = staticmethod(multiprocessing.dummy.Value)
Array = staticmethod(multiprocessing.dummy.Array)
#
# Functions used to create test cases from the base ones in this module
#
def install_tests_in_module_dict(remote_globs, start_method):
__module__ = remote_globs['__name__']
local_globs = globals()
ALL_TYPES = {'processes', 'threads', 'manager'}
for name, base in local_globs.items():
if not isinstance(base, type):
continue
if issubclass(base, BaseTestCase):
if base is BaseTestCase:
continue
assert set(base.ALLOWED_TYPES) <= ALL_TYPES, base.ALLOWED_TYPES
for type_ in base.ALLOWED_TYPES:
newname = 'With' + type_.capitalize() + name[1:]
Mixin = local_globs[type_.capitalize() + 'Mixin']
class Temp(base, Mixin, unittest.TestCase):
pass
if type_ == 'manager':
Temp = hashlib_helper.requires_hashdigest('md5')(Temp)
Temp.__name__ = Temp.__qualname__ = newname
Temp.__module__ = __module__
remote_globs[newname] = Temp
elif issubclass(base, unittest.TestCase):
class Temp(base, object):
pass
Temp.__name__ = Temp.__qualname__ = name
Temp.__module__ = __module__
remote_globs[name] = Temp
dangling = [None, None]
old_start_method = [None]
def setUpModule():
multiprocessing.set_forkserver_preload(PRELOAD)
multiprocessing.process._cleanup()
dangling[0] = multiprocessing.process._dangling.copy()
dangling[1] = threading._dangling.copy()
old_start_method[0] = multiprocessing.get_start_method(allow_none=True)
try:
multiprocessing.set_start_method(start_method, force=True)
except ValueError:
raise unittest.SkipTest(start_method +
' start method not supported')
if sys.platform.startswith("linux"):
try:
lock = multiprocessing.RLock()
except OSError:
raise unittest.SkipTest("OSError raises on RLock creation, "
"see issue 3111!")
check_enough_semaphores()
util.get_temp_dir() # creates temp directory
multiprocessing.get_logger().setLevel(LOG_LEVEL)
def tearDownModule():
need_sleep = False
# bpo-26762: Some multiprocessing objects like Pool create reference
# cycles. Trigger a garbage collection to break these cycles.
test.support.gc_collect()
multiprocessing.set_start_method(old_start_method[0], force=True)
# pause a bit so we don't get warning about dangling threads/processes
processes = set(multiprocessing.process._dangling) - set(dangling[0])
if processes:
need_sleep = True
test.support.environment_altered = True
support.print_warning(f'Dangling processes: {processes}')
processes = None
threads = set(threading._dangling) - set(dangling[1])
if threads:
need_sleep = True
test.support.environment_altered = True
support.print_warning(f'Dangling threads: {threads}')
threads = None
# Sleep 500 ms to give time to child processes to complete.
if need_sleep:
time.sleep(0.5)
multiprocessing.util._cleanup_tests()
remote_globs['setUpModule'] = setUpModule
remote_globs['tearDownModule'] = tearDownModule
@unittest.skipIf(not hasattr(_multiprocessing, 'SemLock'), 'SemLock not available')
@unittest.skipIf(sys.platform != "linux", "Linux only")
class SemLockTests(unittest.TestCase):
def test_semlock_subclass(self):
class SemLock(_multiprocessing.SemLock):
pass
name = f'test_semlock_subclass-{os.getpid()}'
s = SemLock(1, 0, 10, name, 0)
_multiprocessing.sem_unlink(name)
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