#!/usr/bin/env python # # Unit tests for the multiprocessing package # import unittest import threading import queue as pyqueue import time import io import sys import os import gc import signal import array import copy import socket import random import logging import test.support # 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 multiprocessing.dummy import multiprocessing.connection import multiprocessing.managers import multiprocessing.heap import multiprocessing.pool from multiprocessing import util # # # 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") # # 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) # # Return the value of a semaphore # def get_value(self): try: return self.get_value() except AttributeError: try: return self._Semaphore__value except AttributeError: try: return self._value except AttributeError: raise NotImplementedError # # Testcases # class _TestProcess(BaseTestCase): ALLOWED_TYPES = ('processes', 'threads') def test_current(self): if self.TYPE == 'threads': return current = self.current_process() authkey = current.authkey self.assertTrue(current.is_alive()) self.assertTrue(not current.daemon) self.assertIsInstance(authkey, bytes) self.assertTrue(len(authkey) > 0) self.assertEqual(current.ident, os.getpid()) self.assertEqual(current.exitcode, None) def _test(self, q, *args, **kwds): current = self.current_process() q.put(args) q.put(kwds) q.put(current.name) if self.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.assertEquals(p.authkey, current.authkey) self.assertEquals(p.is_alive(), False) self.assertEquals(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.assertEquals(p.exitcode, None) self.assertEquals(p.is_alive(), True) self.assertIn(p, self.active_children()) self.assertEquals(q.get(), args[1:]) self.assertEquals(q.get(), kwargs) self.assertEquals(q.get(), p.name) if self.TYPE != 'threads': self.assertEquals(q.get(), current.authkey) self.assertEquals(q.get(), p.pid) p.join() self.assertEquals(p.exitcode, 0) self.assertEquals(p.is_alive(), False) self.assertNotIn(p, self.active_children()) def _test_terminate(self): time.sleep(1000) def test_terminate(self): if self.TYPE == 'threads': return p = self.Process(target=self._test_terminate) p.daemon = True p.start() self.assertEqual(p.is_alive(), True) self.assertIn(p, self.active_children()) self.assertEqual(p.exitcode, None) p.terminate() join = TimingWrapper(p.join) self.assertEqual(join(), None) self.assertTimingAlmostEqual(join.elapsed, 0.0) self.assertEqual(p.is_alive(), False) self.assertNotIn(p, self.active_children()) p.join() # XXX sometimes get p.exitcode == 0 on Windows ... #self.assertEqual(p.exitcode, -signal.SIGTERM) def test_cpu_count(self): try: cpus = multiprocessing.cpu_count() except NotImplementedError: cpus = 1 self.assertTrue(type(cpus) is int) self.assertTrue(cpus >= 1) def test_active_children(self): self.assertEqual(type(self.active_children()), list) p = self.Process(target=time.sleep, args=(DELTA,)) self.assertNotIn(p, self.active_children()) p.start() self.assertIn(p, self.active_children()) p.join() self.assertNotIn(p, self.active_children()) def _test_recursion(self, wconn, id): from multiprocessing import forking wconn.send(id) if len(id) < 2: for i in range(2): p = self.Process( target=self._test_recursion, args=(wconn, id+[i]) ) p.start() p.join() def test_recursion(self): rconn, wconn = self.Pipe(duplex=False) self._test_recursion(wconn, []) time.sleep(DELTA) result = [] while rconn.poll(): result.append(rconn.recv()) expected = [ [], [0], [0, 0], [0, 1], [1], [1, 0], [1, 1] ] self.assertEqual(result, expected) # # # class _UpperCaser(multiprocessing.Process): def __init__(self): multiprocessing.Process.__init__(self) self.child_conn, self.parent_conn = multiprocessing.Pipe() def run(self): self.parent_conn.close() for s in iter(self.child_conn.recv, None): self.child_conn.send(s.upper()) self.child_conn.close() def submit(self, s): assert type(s) is str self.parent_conn.send(s) return self.parent_conn.recv() def stop(self): self.parent_conn.send(None) self.parent_conn.close() self.child_conn.close() class _TestSubclassingProcess(BaseTestCase): ALLOWED_TYPES = ('processes',) def test_subclassing(self): uppercaser = _UpperCaser() uppercaser.start() self.assertEqual(uppercaser.submit('hello'), 'HELLO') self.assertEqual(uppercaser.submit('world'), 'WORLD') uppercaser.stop() uppercaser.join() # # # 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): def _test_put(self, 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() def _test_get(self, 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() def _test_fork(self, 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.start() # check that all expected items are in the queue for i in range(20): self.assertEqual(queue.get(), i) self.assertRaises(pyqueue.Empty, queue.get, False) p.join() def test_qsize(self): q = self.Queue() try: self.assertEqual(q.qsize(), 0) except NotImplementedError: return q.put(1) self.assertEqual(q.qsize(), 1) q.put(5) self.assertEqual(q.qsize(), 2) q.get() self.assertEqual(q.qsize(), 1) q.get() self.assertEqual(q.qsize(), 0) def _test_task_done(self, 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'): return workers = [self.Process(target=self._test_task_done, args=(queue,)) for i in range(4)] for p in workers: p.start() for i in range(10): queue.put(i) queue.join() for p in workers: queue.put(None) for p in workers: p.join() # # # class _TestLock(BaseTestCase): def test_lock(self): lock = self.Lock() self.assertEqual(lock.acquire(), True) self.assertEqual(lock.acquire(False), False) self.assertEqual(lock.release(), None) self.assertRaises((ValueError, threading.ThreadError), lock.release) def test_rlock(self): lock = self.RLock() self.assertEqual(lock.acquire(), True) self.assertEqual(lock.acquire(), True) self.assertEqual(lock.acquire(), True) self.assertEqual(lock.release(), None) self.assertEqual(lock.release(), None) self.assertEqual(lock.release(), None) self.assertRaises((AssertionError, RuntimeError), lock.release) def test_lock_context(self): with self.Lock(): pass class _TestSemaphore(BaseTestCase): def _test_semaphore(self, sem): self.assertReturnsIfImplemented(2, get_value, sem) self.assertEqual(sem.acquire(), True) self.assertReturnsIfImplemented(1, get_value, sem) self.assertEqual(sem.acquire(), True) self.assertReturnsIfImplemented(0, get_value, sem) self.assertEqual(sem.acquire(False), False) self.assertReturnsIfImplemented(0, get_value, sem) self.assertEqual(sem.release(), None) self.assertReturnsIfImplemented(1, get_value, sem) self.assertEqual(sem.release(), None) self.assertReturnsIfImplemented(2, get_value, sem) def test_semaphore(self): sem = self.Semaphore(2) self._test_semaphore(sem) self.assertEqual(sem.release(), None) self.assertReturnsIfImplemented(3, get_value, sem) self.assertEqual(sem.release(), None) self.assertReturnsIfImplemented(4, get_value, sem) def test_bounded_semaphore(self): sem = self.BoundedSemaphore(2) self._test_semaphore(sem) # Currently fails on OS/X #if HAVE_GETVALUE: # self.assertRaises(ValueError, sem.release) # self.assertReturnsIfImplemented(2, get_value, sem) def test_timeout(self): if self.TYPE != 'processes': return sem = self.Semaphore(0) acquire = TimingWrapper(sem.acquire) self.assertEqual(acquire(False), False) self.assertTimingAlmostEqual(acquire.elapsed, 0.0) self.assertEqual(acquire(False, None), False) self.assertTimingAlmostEqual(acquire.elapsed, 0.0) self.assertEqual(acquire(False, TIMEOUT1), False) self.assertTimingAlmostEqual(acquire.elapsed, 0) self.assertEqual(acquire(True, TIMEOUT2), False) self.assertTimingAlmostEqual(acquire.elapsed, TIMEOUT2) self.assertEqual(acquire(timeout=TIMEOUT3), False) self.assertTimingAlmostEqual(acquire.elapsed, TIMEOUT3) class _TestCondition(BaseTestCase): def f(self, 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 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, None) self.assertTimingAlmostEqual(wait.elapsed, TIMEOUT1) class _TestEvent(BaseTestCase): def _test_event(self, event): time.sleep(TIMEOUT2) event.set() def test_event(self): event = self.Event() wait = TimingWrapper(event.wait) # Removed temporaily, 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) self.Process(target=self._test_event, args=(event,)).start() self.assertEqual(wait(), True) # # # class _TestValue(BaseTestCase): codes_values = [ ('i', 4343, 24234), ('d', 3.625, -4.25), ('h', -232, 234), ('c', latin('x'), latin('y')) ] def _test(self, values): for sv, cv in zip(values, self.codes_values): sv.value = cv[2] def test_value(self, raw=False): if self.TYPE != 'processes': return 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.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): if self.TYPE != 'processes': return 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): def f(self, seq): for i in range(1, len(seq)): seq[i] += seq[i-1] def test_array(self, raw=False): if self.TYPE != 'processes': return 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.start() p.join() self.assertEqual(list(arr[:]), seq) def test_rawarray(self): self.test_array(raw=True) def test_getobj_getlock_obj(self): if self.TYPE != 'processes': return arr1 = self.Array('i', list(range(10))) lock1 = arr1.get_lock() obj1 = arr1.get_obj() arr2 = self.Array('i', list(range(10)), lock=None) lock2 = arr2.get_lock() obj2 = arr2.get_obj() lock = self.Lock() arr3 = self.Array('i', list(range(10)), lock=lock) lock3 = arr3.get_lock() obj3 = arr3.get_obj() self.assertEqual(lock, lock3) arr4 = self.Array('i', range(10), lock=False) self.assertFalse(hasattr(arr4, 'get_lock')) self.assertFalse(hasattr(arr4, 'get_obj')) self.assertRaises(AttributeError, self.Array, 'i', range(10), lock='notalock') arr5 = self.RawArray('i', range(10)) self.assertFalse(hasattr(arr5, 'get_lock')) self.assertFalse(hasattr(arr5, 'get_obj')) # # # class _TestContainers(BaseTestCase): ALLOWED_TYPES = ('manager',) def test_list(self): a = self.list(list(range(10))) self.assertEqual(a[:], list(range(10))) b = self.list() self.assertEqual(b[:], []) b.extend(list(range(5))) self.assertEqual(b[:], list(range(5))) self.assertEqual(b[2], 2) self.assertEqual(b[2:10], [2,3,4]) b *= 2 self.assertEqual(b[:], [0, 1, 2, 3, 4, 0, 1, 2, 3, 4]) self.assertEqual(b + [5, 6], [0, 1, 2, 3, 4, 0, 1, 2, 3, 4, 5, 6]) self.assertEqual(a[:], list(range(10))) d = [a, b] e = self.list(d) self.assertEqual( e[:], [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [0, 1, 2, 3, 4, 0, 1, 2, 3, 4]] ) f = self.list([a]) a.append('hello') self.assertEqual(f[:], [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'hello']]) def test_dict(self): d = self.dict() indices = list(range(65, 70)) for i in indices: d[i] = chr(i) self.assertEqual(d.copy(), dict((i, chr(i)) for i in indices)) self.assertEqual(sorted(d.keys()), indices) self.assertEqual(sorted(d.values()), [chr(i) for i in indices]) self.assertEqual(sorted(d.items()), [(i, chr(i)) for i in indices]) def test_namespace(self): n = self.Namespace() n.name = 'Bob' n.job = 'Builder' n._hidden = 'hidden' self.assertEqual((n.name, n.job), ('Bob', 'Builder')) del n.job self.assertEqual(str(n), "Namespace(name='Bob')") self.assertTrue(hasattr(n, 'name')) self.assertTrue(not hasattr(n, 'job')) # # # def sqr(x, wait=0.0): time.sleep(wait) return x*x class _TestPool(BaseTestCase): def test_apply(self): papply = self.pool.apply self.assertEqual(papply(sqr, (5,)), sqr(5)) self.assertEqual(papply(sqr, (), {'x':3}), sqr(x=3)) def test_map(self): pmap = self.pool.map self.assertEqual(pmap(sqr, list(range(10))), list(map(sqr, list(range(10))))) self.assertEqual(pmap(sqr, list(range(100)), chunksize=20), list(map(sqr, list(range(100))))) def test_map_chunksize(self): try: self.pool.map_async(sqr, [], chunksize=1).get(timeout=TIMEOUT1) except multiprocessing.TimeoutError: self.fail("pool.map_async with chunksize stalled on null list") def test_async(self): res = self.pool.apply_async(sqr, (7, TIMEOUT1,)) get = TimingWrapper(res.get) self.assertEqual(get(), 49) self.assertTimingAlmostEqual(get.elapsed, TIMEOUT1) def test_async_timeout(self): res = self.pool.apply_async(sqr, (6, TIMEOUT2 + 0.2)) get = TimingWrapper(res.get) self.assertRaises(multiprocessing.TimeoutError, get, timeout=TIMEOUT2) self.assertTimingAlmostEqual(get.elapsed, TIMEOUT2) def test_imap(self): it = self.pool.imap(sqr, list(range(10))) self.assertEqual(list(it), list(map(sqr, list(range(10))))) it = self.pool.imap(sqr, list(range(10))) for i in range(10): self.assertEqual(next(it), i*i) self.assertRaises(StopIteration, it.__next__) it = self.pool.imap(sqr, list(range(1000)), chunksize=100) for i in range(1000): self.assertEqual(next(it), i*i) self.assertRaises(StopIteration, it.__next__) def test_imap_unordered(self): it = self.pool.imap_unordered(sqr, list(range(1000))) self.assertEqual(sorted(it), list(map(sqr, list(range(1000))))) it = self.pool.imap_unordered(sqr, list(range(1000)), chunksize=53) self.assertEqual(sorted(it), list(map(sqr, list(range(1000))))) def test_make_pool(self): p = multiprocessing.Pool(3) self.assertEqual(3, len(p._pool)) p.close() p.join() def test_terminate(self): if self.TYPE == 'manager': # On Unix a forked process increfs each shared object to # which its parent process held a reference. If the # forked process gets terminated then there is likely to # be a reference leak. So to prevent # _TestZZZNumberOfObjects from failing we skip this test # when using a manager. return result = self.pool.map_async( time.sleep, [0.1 for i in range(10000)], chunksize=1 ) self.pool.terminate() join = TimingWrapper(self.pool.join) join() self.assertTrue(join.elapsed < 0.2) 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 = 5 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() # # Test that manager has expected number of shared objects left # class _TestZZZNumberOfObjects(BaseTestCase): # Because test cases are sorted alphabetically, this one will get # run after all the other tests for the manager. It tests that # there have been no "reference leaks" for the manager's shared # objects. Note the comment in _TestPool.test_terminate(). ALLOWED_TYPES = ('manager',) def test_number_of_objects(self): EXPECTED_NUMBER = 1 # the pool object is still alive multiprocessing.active_children() # discard dead process objs gc.collect() # do garbage collection refs = self.manager._number_of_objects() debug_info = self.manager._debug_info() if refs != EXPECTED_NUMBER: print(self.manager._debug_info()) print(debug_info) self.assertEqual(refs, EXPECTED_NUMBER) # # Test of creating a customized manager class # from multiprocessing.managers import BaseManager, BaseProxy, RemoteError class FooBar(object): def f(self): return 'f()' def g(self): raise ValueError def _h(self): return '_h()' def baz(): for i in range(10): yield i*i class IteratorProxy(BaseProxy): _exposed_ = ('next', '__next__') def __iter__(self): return self def __next__(self): return self._callmethod('next') def __next__(self): return self._callmethod('__next__') class MyManager(BaseManager): pass MyManager.register('Foo', callable=FooBar) MyManager.register('Bar', callable=FooBar, exposed=('f', '_h')) MyManager.register('baz', callable=baz, proxytype=IteratorProxy) class _TestMyManager(BaseTestCase): ALLOWED_TYPES = ('manager',) def test_mymanager(self): manager = MyManager() manager.start() foo = manager.Foo() bar = manager.Bar() baz = manager.baz() foo_methods = [name for name in ('f', 'g', '_h') if hasattr(foo, name)] bar_methods = [name for name in ('f', 'g', '_h') if hasattr(bar, name)] self.assertEqual(foo_methods, ['f', 'g']) self.assertEqual(bar_methods, ['f', '_h']) self.assertEqual(foo.f(), 'f()') self.assertRaises(ValueError, foo.g) self.assertEqual(foo._callmethod('f'), 'f()') self.assertRaises(RemoteError, foo._callmethod, '_h') self.assertEqual(bar.f(), 'f()') self.assertEqual(bar._h(), '_h()') self.assertEqual(bar._callmethod('f'), 'f()') self.assertEqual(bar._callmethod('_h'), '_h()') self.assertEqual(list(baz), [i*i for i in range(10)]) manager.shutdown() # # Test of connecting to a remote server and using xmlrpclib for serialization # _queue = pyqueue.Queue() def get_queue(): return _queue class QueueManager(BaseManager): '''manager class used by server process''' QueueManager.register('get_queue', callable=get_queue) class QueueManager2(BaseManager): '''manager class which specifies the same interface as QueueManager''' QueueManager2.register('get_queue') SERIALIZER = 'xmlrpclib' class _TestRemoteManager(BaseTestCase): ALLOWED_TYPES = ('manager',) def _putter(self, address, authkey): manager = QueueManager2( address=address, authkey=authkey, serializer=SERIALIZER ) manager.connect() queue = manager.get_queue() queue.put(('hello world', None, True, 2.25)) def test_remote(self): authkey = os.urandom(32) manager = QueueManager( address=('localhost', 0), authkey=authkey, serializer=SERIALIZER ) manager.start() p = self.Process(target=self._putter, args=(manager.address, authkey)) p.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): def _putter(self, 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) port = test.support.find_unused_port() manager = QueueManager( address=('localhost', port), authkey=authkey, serializer=SERIALIZER) manager.start() p = self.Process(target=self._putter, args=(manager.address, authkey)) p.start() queue = manager.get_queue() self.assertEqual(queue.get(), 'hello world') del queue manager.shutdown() manager = QueueManager( address=('localhost', port), authkey=authkey, serializer=SERIALIZER) manager.start() manager.shutdown() # # # SENTINEL = latin('') class _TestConnection(BaseTestCase): ALLOWED_TYPES = ('processes', 'threads') def _echo(self, conn): for msg in iter(conn.recv_bytes, SENTINEL): conn.send_bytes(msg) conn.close() def test_connection(self): conn, child_conn = self.Pipe() p = self.Process(target=self._echo, args=(child_conn,)) p.daemon = True p.start() seq = [1, 2.25, None] msg = latin('hello world') longmsg = msg * 10 arr = array.array('i', list(range(4))) if self.TYPE == 'processes': self.assertEqual(type(conn.fileno()), int) self.assertEqual(conn.send(seq), None) self.assertEqual(conn.recv(), seq) self.assertEqual(conn.send_bytes(msg), None) self.assertEqual(conn.recv_bytes(), msg) if self.TYPE == 'processes': buffer = array.array('i', [0]*10) expected = list(arr) + [0] * (10 - len(arr)) self.assertEqual(conn.send_bytes(arr), None) self.assertEqual(conn.recv_bytes_into(buffer), len(arr) * buffer.itemsize) self.assertEqual(list(buffer), expected) buffer = array.array('i', [0]*10) expected = [0] * 3 + list(arr) + [0] * (10 - 3 - len(arr)) self.assertEqual(conn.send_bytes(arr), None) self.assertEqual(conn.recv_bytes_into(buffer, 3 * buffer.itemsize), len(arr) * buffer.itemsize) self.assertEqual(list(buffer), expected) buffer = bytearray(latin(' ' * 40)) self.assertEqual(conn.send_bytes(longmsg), None) try: res = conn.recv_bytes_into(buffer) except multiprocessing.BufferTooShort as e: self.assertEqual(e.args, (longmsg,)) else: self.fail('expected BufferTooShort, got %s' % res) poll = TimingWrapper(conn.poll) self.assertEqual(poll(), False) self.assertTimingAlmostEqual(poll.elapsed, 0) self.assertEqual(poll(TIMEOUT1), False) self.assertTimingAlmostEqual(poll.elapsed, TIMEOUT1) conn.send(None) self.assertEqual(poll(TIMEOUT1), True) self.assertTimingAlmostEqual(poll.elapsed, 0) self.assertEqual(conn.recv(), None) really_big_msg = latin('X') * (1024 * 1024 * 16) # 16Mb conn.send_bytes(really_big_msg) self.assertEqual(conn.recv_bytes(), really_big_msg) conn.send_bytes(SENTINEL) # tell child to quit child_conn.close() if self.TYPE == 'processes': self.assertEqual(conn.readable, True) self.assertEqual(conn.writable, True) self.assertRaises(EOFError, conn.recv) self.assertRaises(EOFError, conn.recv_bytes) p.join() def test_duplex_false(self): reader, writer = self.Pipe(duplex=False) self.assertEqual(writer.send(1), None) self.assertEqual(reader.recv(), 1) if self.TYPE == 'processes': self.assertEqual(reader.readable, True) self.assertEqual(reader.writable, False) self.assertEqual(writer.readable, False) self.assertEqual(writer.writable, True) self.assertRaises(IOError, reader.send, 2) self.assertRaises(IOError, writer.recv) self.assertRaises(IOError, writer.poll) def test_spawn_close(self): # We test that a pipe connection can be closed by parent # process immediately after child is spawned. On Windows this # would have sometimes failed on old versions because # child_conn would be closed before the child got a chance to # duplicate it. conn, child_conn = self.Pipe() p = self.Process(target=self._echo, args=(child_conn,)) p.start() child_conn.close() # this might complete before child initializes msg = latin('hello') conn.send_bytes(msg) self.assertEqual(conn.recv_bytes(), msg) conn.send_bytes(SENTINEL) conn.close() p.join() def test_sendbytes(self): if self.TYPE != 'processes': return msg = latin('abcdefghijklmnopqrstuvwxyz') a, b = self.Pipe() a.send_bytes(msg) self.assertEqual(b.recv_bytes(), msg) a.send_bytes(msg, 5) self.assertEqual(b.recv_bytes(), msg[5:]) a.send_bytes(msg, 7, 8) self.assertEqual(b.recv_bytes(), msg[7:7+8]) a.send_bytes(msg, 26) self.assertEqual(b.recv_bytes(), latin('')) a.send_bytes(msg, 26, 0) self.assertEqual(b.recv_bytes(), latin('')) self.assertRaises(ValueError, a.send_bytes, msg, 27) self.assertRaises(ValueError, a.send_bytes, msg, 22, 5) self.assertRaises(ValueError, a.send_bytes, msg, 26, 1) self.assertRaises(ValueError, a.send_bytes, msg, -1) self.assertRaises(ValueError, a.send_bytes, msg, 4, -1) class _TestListenerClient(BaseTestCase): ALLOWED_TYPES = ('processes', 'threads') def _test(self, address): conn = self.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() # # Test of sending connection and socket objects between processes # """ class _TestPicklingConnections(BaseTestCase): ALLOWED_TYPES = ('processes',) def _listener(self, conn, families): for fam in families: l = self.connection.Listener(family=fam) conn.send(l.address) new_conn = l.accept() conn.send(new_conn) if self.TYPE == 'processes': l = socket.socket() l.bind(('localhost', 0)) conn.send(l.getsockname()) l.listen(1) new_conn, addr = l.accept() conn.send(new_conn) conn.recv() def _remote(self, conn): for (address, msg) in iter(conn.recv, None): client = self.connection.Client(address) client.send(msg.upper()) client.close() if self.TYPE == 'processes': address, msg = conn.recv() client = socket.socket() client.connect(address) client.sendall(msg.upper()) client.close() conn.close() def test_pickling(self): try: multiprocessing.allow_connection_pickling() except ImportError: return families = self.connection.families lconn, lconn0 = self.Pipe() lp = self.Process(target=self._listener, args=(lconn0, families)) lp.start() lconn0.close() rconn, rconn0 = self.Pipe() rp = self.Process(target=self._remote, args=(rconn0,)) rp.start() rconn0.close() for fam in families: msg = ('This connection uses family %s' % fam).encode('ascii') address = lconn.recv() rconn.send((address, msg)) new_conn = lconn.recv() self.assertEqual(new_conn.recv(), msg.upper()) rconn.send(None) if self.TYPE == 'processes': msg = latin('This connection uses a normal socket') address = lconn.recv() rconn.send((address, msg)) if hasattr(socket, 'fromfd'): new_conn = lconn.recv() self.assertEqual(new_conn.recv(100), msg.upper()) else: # XXX On Windows with Py2.6 need to backport fromfd() discard = lconn.recv_bytes() lconn.send(None) rconn.close() lconn.close() lp.join() rp.join() """ # # # class _TestHeap(BaseTestCase): ALLOWED_TYPES = ('processes',) def test_heap(self): iterations = 5000 maxblocks = 50 blocks = [] # create and destroy lots of blocks of different sizes for i in range(iterations): size = int(random.lognormvariate(0, 1) * 1000) b = multiprocessing.heap.BufferWrapper(size) blocks.append(b) if len(blocks) > maxblocks: i = random.randrange(maxblocks) del blocks[i] # get the heap object heap = multiprocessing.heap.BufferWrapper._heap # verify the state of the heap all = [] occupied = 0 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)) # # # try: from ctypes import Structure, Value, copy, c_int, c_double except ImportError: Structure = object c_int = c_double = None class _Foo(Structure): _fields_ = [ ('x', c_int), ('y', c_double) ] class _TestSharedCTypes(BaseTestCase): ALLOWED_TYPES = ('processes',) def _double(self, 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): if c_int is None: return x = Value('i', 7, lock=lock) y = Value(ctypes.c_double, 1.0/3.0, lock=lock) foo = Value(_Foo, 3, 2, lock=lock) arr = Array('d', list(range(10)), lock=lock) string = Array('c', 20, lock=lock) string.value = 'hello' p = self.Process(target=self._double, args=(x, y, foo, arr, string)) 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): if c_int is None: return 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',) def _test_finalize(self, 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 mutliprocessing'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.start() p.join() result = [obj for obj in iter(conn.recv, 'STOP')] self.assertEqual(result, ['a', 'b', 'd10', 'd03', 'd02', 'd01', 'e']) # # Test that from ... import * works for each module # class _TestImportStar(BaseTestCase): ALLOWED_TYPES = ('processes',) def test_import(self): modules = ( 'multiprocessing', 'multiprocessing.connection', 'multiprocessing.heap', 'multiprocessing.managers', 'multiprocessing.pool', 'multiprocessing.process', 'multiprocessing.reduction', 'multiprocessing.sharedctypes', 'multiprocessing.synchronize', 'multiprocessing.util' ) for name in modules: __import__(name) mod = sys.modules[name] for attr in getattr(mod, '__all__', ()): self.assertTrue( hasattr(mod, attr), '%r does not have attribute %r' % (mod, attr) ) # # Quick test that logging works -- does not test logging output # class _TestLogging(BaseTestCase): ALLOWED_TYPES = ('processes',) def test_enable_logging(self): logger = multiprocessing.get_logger() logger.setLevel(util.SUBWARNING) self.assertTrue(logger is not None) logger.debug('this will not be printed') logger.info('nor will this') logger.setLevel(LOG_LEVEL) def _test_level(self, 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) self.Process(target=self._test_level, args=(writer,)).start() self.assertEqual(LEVEL1, reader.recv()) logger.setLevel(logging.NOTSET) root_logger.setLevel(LEVEL2) self.Process(target=self._test_level, args=(writer,)).start() self.assertEqual(LEVEL2, reader.recv()) root_logger.setLevel(root_level) logger.setLevel(level=LOG_LEVEL) # class _TestLoggingProcessName(BaseTestCase): # # def handle(self, record): # assert record.processName == multiprocessing.current_process().name # self.__handled = True # # def test_logging(self): # handler = logging.Handler() # handler.handle = self.handle # self.__handled = False # # Bypass getLogger() and side-effects # logger = logging.getLoggerClass()( # 'multiprocessing.test.TestLoggingProcessName') # logger.addHandler(handler) # logger.propagate = False # # logger.warn('foo') # assert self.__handled # # Test to verify handle verification, see issue 3321 # class TestInvalidHandle(unittest.TestCase): def test_invalid_handles(self): if WIN32: return conn = _multiprocessing.Connection(44977608) self.assertRaises(IOError, conn.poll) self.assertRaises(IOError, _multiprocessing.Connection, -1) # # Functions used to create test cases from the base ones in this module # def get_attributes(Source, names): d = {} for name in names: obj = getattr(Source, name) if type(obj) == type(get_attributes): obj = staticmethod(obj) d[name] = obj return d def create_test_cases(Mixin, type): result = {} glob = globals() Type = type[0].upper() + type[1:] for name in list(glob.keys()): if name.startswith('_Test'): base = glob[name] if type in base.ALLOWED_TYPES: newname = 'With' + Type + name[1:] class Temp(base, unittest.TestCase, Mixin): pass result[newname] = Temp Temp.__name__ = newname Temp.__module__ = Mixin.__module__ return result # # Create test cases # class ProcessesMixin(object): TYPE = 'processes' Process = multiprocessing.Process locals().update(get_attributes(multiprocessing, ( 'Queue', 'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Condition', 'Event', 'Value', 'Array', 'RawValue', 'RawArray', 'current_process', 'active_children', 'Pipe', 'connection', 'JoinableQueue' ))) testcases_processes = create_test_cases(ProcessesMixin, type='processes') globals().update(testcases_processes) class ManagerMixin(object): TYPE = 'manager' Process = multiprocessing.Process manager = object.__new__(multiprocessing.managers.SyncManager) locals().update(get_attributes(manager, ( 'Queue', 'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Condition', 'Event', 'Value', 'Array', 'list', 'dict', 'Namespace', 'JoinableQueue' ))) testcases_manager = create_test_cases(ManagerMixin, type='manager') globals().update(testcases_manager) class ThreadsMixin(object): TYPE = 'threads' Process = multiprocessing.dummy.Process locals().update(get_attributes(multiprocessing.dummy, ( 'Queue', 'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Condition', 'Event', 'Value', 'Array', 'current_process', 'active_children', 'Pipe', 'connection', 'dict', 'list', 'Namespace', 'JoinableQueue' ))) testcases_threads = create_test_cases(ThreadsMixin, type='threads') globals().update(testcases_threads) class OtherTest(unittest.TestCase): # TODO: add more tests for deliver/answer challenge. def test_deliver_challenge_auth_failure(self): class _FakeConnection(object): def recv_bytes(self, size): return b'something bogus' def send_bytes(self, data): pass self.assertRaises(multiprocessing.AuthenticationError, multiprocessing.connection.deliver_challenge, _FakeConnection(), b'abc') def test_answer_challenge_auth_failure(self): class _FakeConnection(object): def __init__(self): self.count = 0 def recv_bytes(self, size): self.count += 1 if self.count == 1: return multiprocessing.connection.CHALLENGE elif self.count == 2: return b'something bogus' return b'' def send_bytes(self, data): pass self.assertRaises(multiprocessing.AuthenticationError, multiprocessing.connection.answer_challenge, _FakeConnection(), b'abc') # # Test Manager.start()/Pool.__init__() initializer feature - see issue 5585 # def initializer(ns): ns.test += 1 class TestInitializers(unittest.TestCase): def setUp(self): self.mgr = multiprocessing.Manager() self.ns = self.mgr.Namespace() self.ns.test = 0 def tearDown(self): self.mgr.shutdown() def test_manager_initializer(self): m = multiprocessing.managers.SyncManager() self.assertRaises(TypeError, m.start, 1) m.start(initializer, (self.ns,)) self.assertEqual(self.ns.test, 1) m.shutdown() def test_pool_initializer(self): self.assertRaises(TypeError, multiprocessing.Pool, initializer=1) p = multiprocessing.Pool(1, initializer, (self.ns,)) p.close() p.join() self.assertEqual(self.ns.test, 1) # # Issue 5155, 5313, 5331: Test process in processes # Verifies os.close(sys.stdin.fileno) vs. sys.stdin.close() behavior # def _ThisSubProcess(q): try: item = q.get(block=False) except pyqueue.Empty: pass def _TestProcess(q): queue = multiprocessing.Queue() subProc = multiprocessing.Process(target=_ThisSubProcess, args=(queue,)) subProc.start() subProc.join() def _afunc(x): return x*x def pool_in_process(): pool = multiprocessing.Pool(processes=4) x = pool.map(_afunc, [1, 2, 3, 4, 5, 6, 7]) class _file_like(object): def __init__(self, delegate): self._delegate = delegate self._pid = None @property def cache(self): pid = os.getpid() # There are no race conditions since fork keeps only the running thread if pid != self._pid: self._pid = pid self._cache = [] return self._cache def write(self, data): self.cache.append(data) def flush(self): self._delegate.write(''.join(self.cache)) self._cache = [] class TestStdinBadfiledescriptor(unittest.TestCase): def test_queue_in_process(self): queue = multiprocessing.Queue() proc = multiprocessing.Process(target=_TestProcess, args=(queue,)) proc.start() proc.join() def test_pool_in_process(self): p = multiprocessing.Process(target=pool_in_process) p.start() p.join() def test_flushing(self): sio = io.StringIO() flike = _file_like(sio) flike.write('foo') proc = multiprocessing.Process(target=lambda: flike.flush()) flike.flush() assert sio.getvalue() == 'foo' testcases_other = [OtherTest, TestInvalidHandle, TestInitializers, TestStdinBadfiledescriptor] # # # def test_main(run=None): if sys.platform.startswith("linux"): try: lock = multiprocessing.RLock() except OSError: raise unittest.SkipTest("OSError raises on RLock creation, see issue 3111!") if run is None: from test.support import run_unittest as run util.get_temp_dir() # creates temp directory for use by all processes multiprocessing.get_logger().setLevel(LOG_LEVEL) ProcessesMixin.pool = multiprocessing.Pool(4) ThreadsMixin.pool = multiprocessing.dummy.Pool(4) ManagerMixin.manager.__init__() ManagerMixin.manager.start() ManagerMixin.pool = ManagerMixin.manager.Pool(4) testcases = ( sorted(testcases_processes.values(), key=lambda tc:tc.__name__) + sorted(testcases_threads.values(), key=lambda tc:tc.__name__) + sorted(testcases_manager.values(), key=lambda tc:tc.__name__) + testcases_other ) loadTestsFromTestCase = unittest.defaultTestLoader.loadTestsFromTestCase suite = unittest.TestSuite(loadTestsFromTestCase(tc) for tc in testcases) run(suite) ThreadsMixin.pool.terminate() ProcessesMixin.pool.terminate() ManagerMixin.pool.terminate() ManagerMixin.manager.shutdown() del ProcessesMixin.pool, ThreadsMixin.pool, ManagerMixin.pool def main(): test_main(unittest.TextTestRunner(verbosity=2).run) if __name__ == '__main__': main()