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cpython/Lib/test/test_multiprocessing.py

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#!/usr/bin/env python3
#
# Unit tests for the multiprocessing package
#
import unittest
import queue as pyqueue
import time
import io
import sys
import os
import gc
import errno
import signal
import array
import socket
import random
import logging
import test.support
import test.script_helper
# Skip tests if _multiprocessing wasn't built.
_multiprocessing = test.support.import_module('_multiprocessing')
# Skip tests if sem_open implementation is broken.
test.support.import_module('multiprocessing.synchronize')
# import threading after _multiprocessing to raise a more revelant error
# message: "No module named _multiprocessing". _multiprocessing is not compiled
# without thread support.
import threading
import multiprocessing.dummy
import multiprocessing.connection
import multiprocessing.managers
import multiprocessing.heap
import multiprocessing.pool
from multiprocessing import util
try:
from multiprocessing import reduction
HAS_REDUCTION = True
except ImportError:
HAS_REDUCTION = False
try:
from multiprocessing.sharedctypes import Value, copy
HAS_SHAREDCTYPES = True
except ImportError:
HAS_SHAREDCTYPES = False
try:
import msvcrt
except ImportError:
msvcrt = None
#
#
#
def latin(s):
return s.encode('latin')
#
# 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
HAVE_GETVALUE = not getattr(_multiprocessing,
'HAVE_BROKEN_SEM_GETVALUE', False)
WIN32 = (sys.platform == "win32")
try:
MAXFD = os.sysconf("SC_OPEN_MAX")
except:
MAXFD = 256
#
# Some tests require ctypes
#
try:
from ctypes import Structure, c_int, c_double
except ImportError:
Structure = object
c_int = c_double = 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.time()
try:
return self.func(*args, **kwds)
finally:
self.elapsed = time.time() - 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 _TestProcess(BaseTestCase):
ALLOWED_TYPES = ('processes', 'threads')
def test_current(self):
if self.TYPE == 'threads':
return
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)
@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_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())
@classmethod
def _test_terminate(cls):
time.sleep(1000)
def test_terminate(self):
if self.TYPE == 'threads':
return
p = self.Process(target=self._test_terminate)
p.daemon = True
p.start()
self.assertEqual(p.is_alive(), True)
self.assertIn(p, self.active_children())
self.assertEqual(p.exitcode, None)
p.terminate()
join = TimingWrapper(p.join)
self.assertEqual(join(), None)
self.assertTimingAlmostEqual(join.elapsed, 0.0)
self.assertEqual(p.is_alive(), False)
self.assertNotIn(p, self.active_children())
p.join()
# XXX sometimes get p.exitcode == 0 on Windows ...
#self.assertEqual(p.exitcode, -signal.SIGTERM)
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):
from multiprocessing import forking
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)
#
#
#
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":
return
testfn = test.support.TESTFN
self.addCleanup(test.support.unlink, testfn)
proc = self.Process(target=self._test_stderr_flush, args=(testfn,))
proc.start()
proc.join()
with open(testfn, 'r') 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):
sys.stderr = open(testfn, 'w')
1/0 # MARKER
@classmethod
def _test_sys_exit(cls, reason, testfn):
sys.stderr = open(testfn, 'w')
sys.exit(reason)
def test_sys_exit(self):
# See Issue 13854
if self.TYPE == 'threads':
return
testfn = test.support.TESTFN
self.addCleanup(test.support.unlink, testfn)
for reason, code in (([1, 2, 3], 1), ('ignore this', 0)):
p = self.Process(target=self._test_sys_exit, args=(reason, testfn))
p.daemon = True
p.start()
p.join(5)
self.assertEqual(p.exitcode, code)
with open(testfn, 'r') as f:
self.assertEqual(f.read().rstrip(), str(reason))
for reason in (True, False, 8):
p = self.Process(target=sys.exit, args=(reason,))
p.daemon = True
p.start()
p.join(5)
self.assertEqual(p.exitcode, reason)
#
#
#
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()
@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()
@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()
def test_qsize(self):
q = self.Queue()
try:
self.assertEqual(q.qsize(), 0)
except NotImplementedError:
return
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)
@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()
if sys.version_info < (2, 5) and not hasattr(queue, 'task_done'):
self.skipTest("requires 'queue.task_done()' method")
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()
#
#
#
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':
return
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 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()
p = threading.Thread(target=self.f, args=(cond, sleeping, woken))
p.daemon = True
p.start()
# 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()
t = threading.Thread(target=self.f,
args=(cond, sleeping, woken, TIMEOUT1))
t.daemon = True
t.start()
# 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()
t = threading.Thread(target=self.f, args=(cond, sleeping, woken))
t.daemon = True
t.start()
# 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
for i in range(10):
try:
if get_value(woken) == 6:
break
except NotImplementedError:
break
time.sleep(DELTA)
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)
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)
#
#
#
class _TestValue(BaseTestCase):
ALLOWED_TYPES = ('processes',)
codes_values = [
('i', 4343, 24234),
('d', 3.625, -4.25),
('h', -232, 234),
('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(
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, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'hello']])
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_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
class _TestPool(BaseTestCase):
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_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_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 + 0.2))
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_unordered(self):
it = self.pool.imap_unordered(sqr, list(range(1000)))
self.assertEqual(sorted(it), list(map(sqr, list(range(1000)))))
it = self.pool.imap_unordered(sqr, list(range(1000)), chunksize=53)
self.assertEqual(sorted(it), list(map(sqr, list(range(1000)))))
def test_make_pool(self):
self.assertRaises(ValueError, multiprocessing.Pool, -1)
self.assertRaises(ValueError, multiprocessing.Pool, 0)
p = multiprocessing.Pool(3)
self.assertEqual(3, len(p._pool))
p.close()
p.join()
def test_terminate(self):
if self.TYPE == 'manager':
# On Unix a forked process increfs each shared object to
# which its parent process held a reference. If the
# forked process gets terminated then there is likely to
# be a reference leak. So to prevent
# _TestZZZNumberOfObjects from failing we skip this test
# when using a manager.
return
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()
self.assertLess(join.elapsed, 0.5)
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 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))
#
# Test that manager has expected number of shared objects left
#
class _TestZZZNumberOfObjects(BaseTestCase):
# Because test cases are sorted alphabetically, this one will get
# run after all the other tests for the manager. It tests that
# there have been no "reference leaks" for the manager's shared
# objects. Note the comment in _TestPool.test_terminate().
ALLOWED_TYPES = ('manager',)
def test_number_of_objects(self):
EXPECTED_NUMBER = 1 # the pool object is still alive
multiprocessing.active_children() # discard dead process objs
gc.collect() # do garbage collection
refs = self.manager._number_of_objects()
debug_info = self.manager._debug_info()
if refs != EXPECTED_NUMBER:
print(self.manager._debug_info())
print(debug_info)
self.assertEqual(refs, EXPECTED_NUMBER)
#
# 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()
manager.start()
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)])
manager.shutdown()
#
# 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',)
@classmethod
def _putter(cls, address, authkey):
manager = QueueManager2(
address=address, authkey=authkey, serializer=SERIALIZER
)
manager.connect()
queue = manager.get_queue()
queue.put(('hello world', None, True, 2.25))
def test_remote(self):
authkey = os.urandom(32)
manager = QueueManager(
address=('localhost', 0), authkey=authkey, serializer=SERIALIZER
)
manager.start()
p = self.Process(target=self._putter, args=(manager.address, authkey))
p.daemon = True
p.start()
manager2 = QueueManager2(
address=manager.address, authkey=authkey, serializer=SERIALIZER
)
manager2.connect()
queue = manager2.get_queue()
# Note that xmlrpclib will deserialize object as a list not a tuple
self.assertEqual(queue.get(), ['hello world', None, True, 2.25])
# 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
manager.shutdown()
class _TestManagerRestart(BaseTestCase):
@classmethod
def _putter(cls, address, authkey):
manager = QueueManager(
address=address, authkey=authkey, serializer=SERIALIZER)
manager.connect()
queue = manager.get_queue()
queue.put('hello world')
def test_rapid_restart(self):
authkey = os.urandom(32)
manager = QueueManager(
address=('localhost', 0), authkey=authkey, serializer=SERIALIZER)
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.daemon = True
p.start()
queue = manager.get_queue()
self.assertEqual(queue.get(), 'hello world')
del queue
manager.shutdown()
manager = QueueManager(
address=addr, authkey=authkey, serializer=SERIALIZER)
try:
manager.start()
except IOError 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)
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(TIMEOUT1), False)
self.assertTimingAlmostEqual(poll.elapsed, TIMEOUT1)
conn.send(None)
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(IOError, reader.send, 2)
self.assertRaises(IOError, writer.recv)
self.assertRaises(IOError, 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':
return
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(test.support.unlink, test.support.TESTFN)
with open(test.support.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(test.support.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(test.support.unlink, test.support.TESTFN)
with open(test.support.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(test.support.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()
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()
#
# Test of sending connection and socket objects between processes
#
"""
class _TestPicklingConnections(BaseTestCase):
ALLOWED_TYPES = ('processes',)
def _listener(self, conn, families):
for fam in families:
l = self.connection.Listener(family=fam)
conn.send(l.address)
new_conn = l.accept()
conn.send(new_conn)
if self.TYPE == 'processes':
l = socket.socket()
l.bind(('localhost', 0))
conn.send(l.getsockname())
l.listen(1)
new_conn, addr = l.accept()
conn.send(new_conn)
conn.recv()
def _remote(self, conn):
for (address, msg) in iter(conn.recv, None):
client = self.connection.Client(address)
client.send(msg.upper())
client.close()
if self.TYPE == 'processes':
address, msg = conn.recv()
client = socket.socket()
client.connect(address)
client.sendall(msg.upper())
client.close()
conn.close()
def test_pickling(self):
try:
multiprocessing.allow_connection_pickling()
except ImportError:
return
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)
if self.TYPE == 'processes':
msg = latin('This connection uses a normal socket')
address = lconn.recv()
rconn.send((address, msg))
if hasattr(socket, 'fromfd'):
new_conn = lconn.recv()
self.assertEqual(new_conn.recv(100), msg.upper())
else:
# XXX On Windows with Py2.6 need to backport fromfd()
discard = lconn.recv_bytes()
lconn.send(None)
rconn.close()
lconn.close()
lp.join()
rp.join()
"""
#
#
#
class _TestHeap(BaseTestCase):
ALLOWED_TYPES = ('processes',)
def test_heap(self):
iterations = 5000
maxblocks = 50
blocks = []
# 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]
# get the heap object
heap = multiprocessing.heap.BufferWrapper._heap
# verify the state of the heap
all = []
occupied = 0
heap._lock.acquire()
self.addCleanup(heap._lock.release)
for L in list(heap._len_to_seq.values()):
for arena, start, stop in L:
all.append((heap._arenas.index(arena), start, stop,
stop-start, 'free'))
for arena, start, stop in heap._allocated_blocks:
all.append((heap._arenas.index(arena), start, stop,
stop-start, 'occupied'))
occupied += (stop-start)
all.sort()
for i in range(len(all)-1):
(arena, start, stop) = all[i][:3]
(narena, nstart, nstop) = all[i+1][:3]
self.assertTrue((arena != narena and nstart == 0) or
(stop == nstart))
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)
]
class _TestSharedCTypes(BaseTestCase):
ALLOWED_TYPES = ('processes',)
def setUp(self):
if not HAS_SHAREDCTYPES:
self.skipTest("requires multiprocessing.sharedctypes")
@classmethod
def _double(cls, x, y, foo, arr, string):
x.value *= 2
y.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)
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, 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(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)
bar = copy(foo)
foo.x = 0
foo.y = 0
self.assertEqual(bar.x, 2)
self.assertAlmostEqual(bar.y, 5.0)
#
#
#
class _TestFinalize(BaseTestCase):
ALLOWED_TYPES = ('processes',)
@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
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
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'])
#
# Test that from ... import * works for each module
#
class _TestImportStar(BaseTestCase):
ALLOWED_TYPES = ('processes',)
def test_import(self):
modules = [
'multiprocessing', 'multiprocessing.connection',
'multiprocessing.heap', 'multiprocessing.managers',
'multiprocessing.pool', 'multiprocessing.process',
'multiprocessing.synchronize', 'multiprocessing.util'
]
if HAS_REDUCTION:
modules.append('multiprocessing.reduction')
if c_int is not None:
# This module requires _ctypes
modules.append('multiprocessing.sharedctypes')
for name in modules:
__import__(name)
mod = sys.modules[name]
for attr in getattr(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.daemon = True
p.start()
self.assertEqual(LEVEL1, reader.recv())
logger.setLevel(logging.NOTSET)
root_logger.setLevel(LEVEL2)
p = self.Process(target=self._test_level, args=(writer,))
p.daemon = True
p.start()
self.assertEqual(LEVEL2, reader.recv())
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
#
# 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(44977608)
self.assertRaises(IOError, conn.poll)
self.assertRaises(IOError, _multiprocessing.Connection, -1)
#
# Functions used to create test cases from the base ones in this module
#
def get_attributes(Source, names):
d = {}
for name in names:
obj = getattr(Source, name)
if type(obj) == type(get_attributes):
obj = staticmethod(obj)
d[name] = obj
return d
def create_test_cases(Mixin, type):
result = {}
glob = globals()
Type = type.capitalize()
for name in list(glob.keys()):
if name.startswith('_Test'):
base = glob[name]
if type in base.ALLOWED_TYPES:
newname = 'With' + Type + name[1:]
class Temp(base, unittest.TestCase, Mixin):
pass
result[newname] = Temp
Temp.__name__ = newname
Temp.__module__ = Mixin.__module__
return result
#
# Create test cases
#
class ProcessesMixin(object):
TYPE = 'processes'
Process = multiprocessing.Process
locals().update(get_attributes(multiprocessing, (
'Queue', 'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore',
'Condition', 'Event', 'Value', 'Array', 'RawValue',
'RawArray', 'current_process', 'active_children', 'Pipe',
'connection', 'JoinableQueue', 'Pool'
)))
testcases_processes = create_test_cases(ProcessesMixin, type='processes')
globals().update(testcases_processes)
class ManagerMixin(object):
TYPE = 'manager'
Process = multiprocessing.Process
manager = object.__new__(multiprocessing.managers.SyncManager)
locals().update(get_attributes(manager, (
'Queue', 'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore',
'Condition', 'Event', 'Value', 'Array', 'list', 'dict',
'Namespace', 'JoinableQueue', 'Pool'
)))
testcases_manager = create_test_cases(ManagerMixin, type='manager')
globals().update(testcases_manager)
class ThreadsMixin(object):
TYPE = 'threads'
Process = multiprocessing.dummy.Process
locals().update(get_attributes(multiprocessing.dummy, (
'Queue', 'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore',
'Condition', 'Event', 'Value', 'Array', 'current_process',
'active_children', 'Pipe', 'connection', 'dict', 'list',
'Namespace', 'JoinableQueue', 'Pool'
)))
testcases_threads = create_test_cases(ThreadsMixin, type='threads')
globals().update(testcases_threads)
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
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()
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()
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 _ThisSubProcess(q):
try:
item = q.get(block=False)
except pyqueue.Empty:
pass
def _TestProcess(q):
queue = multiprocessing.Queue()
subProc = multiprocessing.Process(target=_ThisSubProcess, 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])
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):
queue = multiprocessing.Queue()
proc = multiprocessing.Process(target=_TestProcess, args=(queue,))
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'
#
# 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')
#
# 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()
p.join(10)
finally:
socket.setdefaulttimeout(old_timeout)
#
# Test what happens with no "if __name__ == '__main__'"
#
class TestNoForkBomb(unittest.TestCase):
def test_noforkbomb(self):
name = os.path.join(os.path.dirname(__file__), 'mp_fork_bomb.py')
if WIN32:
rc, out, err = test.script_helper.assert_python_failure(name)
self.assertEqual('', out.decode('ascii'))
self.assertIn('RuntimeError', err.decode('ascii'))
else:
rc, out, err = test.script_helper.assert_python_ok(name)
self.assertEqual('123', out.decode('ascii').rstrip())
self.assertEqual('', err.decode('ascii'))
#
#
#
testcases_other = [OtherTest, TestInvalidHandle, TestInitializers,
TestStdinBadfiledescriptor, TestInvalidFamily,
TestTimeouts, TestNoForkBomb]
#
#
#
def test_main(run=None):
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()
if run is None:
from test.support import run_unittest as run
util.get_temp_dir() # creates temp directory for use by all processes
multiprocessing.get_logger().setLevel(LOG_LEVEL)
ProcessesMixin.pool = multiprocessing.Pool(4)
ThreadsMixin.pool = multiprocessing.dummy.Pool(4)
ManagerMixin.manager.__init__()
ManagerMixin.manager.start()
ManagerMixin.pool = ManagerMixin.manager.Pool(4)
testcases = (
sorted(testcases_processes.values(), key=lambda tc:tc.__name__) +
sorted(testcases_threads.values(), key=lambda tc:tc.__name__) +
sorted(testcases_manager.values(), key=lambda tc:tc.__name__) +
testcases_other
)
loadTestsFromTestCase = unittest.defaultTestLoader.loadTestsFromTestCase
suite = unittest.TestSuite(loadTestsFromTestCase(tc) for tc in testcases)
run(suite)
ThreadsMixin.pool.terminate()
ProcessesMixin.pool.terminate()
ManagerMixin.pool.terminate()
ManagerMixin.manager.shutdown()
del ProcessesMixin.pool, ThreadsMixin.pool, ManagerMixin.pool
def main():
test_main(unittest.TextTestRunner(verbosity=2).run)
if __name__ == '__main__':
main()
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