#!/usr/bin/env python3 # # Unit tests for the multiprocessing package # import unittest import queue as pyqueue 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 struct import operator 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 = 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: 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") 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 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': 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_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_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(100) def test_terminate(self): if self.TYPE == 'threads': self.skipTest('test not appropriate for {}'.format(self.TYPE)) 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) 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) p.terminate() 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() # 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): 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)) # # # 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 = 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': self.skipTest('test not appropriate for {}'.format(self.TYPE)) testfn = test.support.TESTFN self.addCleanup(test.support.unlink, testfn) for reason, code in (([1, 2, 3], 1), ('ignore this', 1)): 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: 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) @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() def test_timeout(self): q = multiprocessing.Queue() start = time.time() self.assertRaises(pyqueue.Empty, q.get, True, 0.2) delta = time.time() - start self.assertGreaterEqual(delta, 0.18) # # # 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 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) @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() p.join(5) self.assertFalse(p.is_alive()) 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.time() result = cond.wait_for(lambda : state.value==4, timeout=expected) dt = time.time() - 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=10)) # 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() p.join(5) 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(10)) if pid is not None: self.assertRaises(KeyboardInterrupt, c.wait, 10) 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) # # 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() for i in range(n): p = namespace.Process(target=self.task) p.daemon = True p.start() 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() 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) f(*args) b.wait_for_finished() @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) @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() 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), ('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 def mul(x, y): return x*y 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_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_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): 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 test_context(self): if self.TYPE == 'processes': L = list(range(10)) expected = [sqr(i) for i in L] with multiprocessing.Pool(2) as p: r = p.map_async(sqr, L) self.assertEqual(r.get(), expected) 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: raise AssertionError('expected RuntimeError') 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()) 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 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() self.common(manager) manager.shutdown() # If the manager process exited cleanly then the exitcode # will be zero. Otherwise (after a short timeout) # terminate() is used, resulting in an exitcode of -SIGTERM. self.assertEqual(manager._process.exitcode, 0) def test_mymanager_context(self): with MyManager() as manager: self.common(manager) self.assertEqual(manager._process.exitcode, 0) def test_mymanager_context_prestarted(self): manager = MyManager() 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',) @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=(test.support.HOST, 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=(test.support.HOST, 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 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) 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(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() 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) 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") class _TestPicklingConnections(BaseTestCase): ALLOWED_TYPES = ('processes',) @classmethod def tearDownClass(cls): from multiprocessing import resource_sharer resource_sharer.stop(timeout=5) @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.socket() l.bind((test.support.HOST, 0)) l.listen(1) 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) # # # 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(unittest.TestCase): def get_module_names(self): import glob folder = os.path.dirname(multiprocessing.__file__) pattern = os.path.join(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.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 # # 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) 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() 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(q): 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): queue = multiprocessing.Queue() proc = multiprocessing.Process(target=_test_process, 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' 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.socket() l.bind((test.support.HOST, 0)) l.listen(4) 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.time() res = wait([a, b], expected) delta = time.time() - start self.assertEqual(res, []) self.assertLess(delta, expected * 2) self.assertGreater(delta, expected * 0.5) b.send(None) start = time.time() res = wait([a, b], 20) delta = time.time() - 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.time() res = wait([a, p.sentinel, b], expected + 20) delta = time.time() - start self.assertEqual(res, [p.sentinel]) self.assertLess(delta, expected + 2) self.assertGreater(delta, expected - 2) a.send(None) start = time.time() res = wait([a, p.sentinel, b], 20) delta = time.time() - start self.assertEqual(sorted_(res), sorted_([p.sentinel, b])) self.assertLess(delta, 0.4) b.send(None) start = time.time() res = wait([a, p.sentinel, b], 20) delta = time.time() - 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.time() res = wait([a], timeout=-1) t = time.time() - 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, subprocess # 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() p.join(10) 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.script_helper.assert_python_failure(name, sm) self.assertEqual('', out.decode('ascii')) self.assertIn('RuntimeError', err.decode('ascii')) else: rc, out, err = test.script_helper.assert_python_ok(name, sm) self.assertEqual('123', out.decode('ascii').rstrip()) self.assertEqual('', err.decode('ascii')) # # Issue #17555: ForkAwareThreadLock # class TestForkAwareThreadLock(unittest.TestCase): # We recurisvely 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() p.join(timeout=5) 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() p.join(timeout=5) 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(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() p.join(timeout=5) 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): @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'*(1024*1024)) # sending 1 MB should block @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'*(1024*1024)) 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 == ['fork', 'spawn', 'forkserver']) # # Check that killing process does not leak named semaphores # @unittest.skipIf(sys.platform == "win32", "test semantics don't make sense on Windows") class TestSemaphoreTracker(unittest.TestCase): def test_semaphore_tracker(self): import subprocess cmd = '''if 1: import multiprocessing as mp, time, os mp.set_start_method("spawn") lock1 = mp.Lock() lock2 = mp.Lock() os.write(%d, lock1._semlock.name.encode("ascii") + b"\\n") os.write(%d, lock2._semlock.name.encode("ascii") + b"\\n") time.sleep(10) ''' r, w = os.pipe() p = subprocess.Popen([sys.executable, '-c', cmd % (w, w)], 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') _multiprocessing.sem_unlink(name1) p.terminate() p.wait() time.sleep(1.0) with self.assertRaises(OSError) as ctx: _multiprocessing.sem_unlink(name2) # docs say it should be ENOENT, but OSX seems to give EINVAL self.assertIn(ctx.exception.errno, (errno.ENOENT, errno.EINVAL)) err = p.stderr.read().decode('utf-8') p.stderr.close() expected = 'semaphore_tracker: There appear to be 2 leaked semaphores' self.assertRegex(err, expected) self.assertRegex(err, 'semaphore_tracker: %r: \[Errno' % name1) # # Mixins # class ProcessesMixin(object): TYPE = 'processes' Process = multiprocessing.Process connection = multiprocessing.connection current_process = staticmethod(multiprocessing.current_process) active_children = staticmethod(multiprocessing.active_children) 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(object): 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): 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) t = 0.01 while len(multiprocessing.active_children()) > 1 and t < 5: time.sleep(t) t *= 2 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. print('Shared objects which still exist at manager shutdown:') print(cls.manager._debug_info()) cls.manager.shutdown() cls.manager.join() cls.manager = None class ThreadsMixin(object): 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.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 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(): multiprocessing.set_start_method(old_start_method[0], force=True) # pause a bit so we don't get warning about dangling threads/processes time.sleep(0.5) multiprocessing.process._cleanup() gc.collect() tmp = set(multiprocessing.process._dangling) - set(dangling[0]) if tmp: print('Dangling processes:', tmp, file=sys.stderr) del tmp tmp = set(threading._dangling) - set(dangling[1]) if tmp: print('Dangling threads:', tmp, file=sys.stderr) remote_globs['setUpModule'] = setUpModule remote_globs['tearDownModule'] = tearDownModule