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Save
Rename
""" Various tests for synchronization primitives. """ import sys import time from _thread import start_new_thread, TIMEOUT_MAX import threading import unittest from test import support 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, f, 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.n = n self.started = [] self.finished = [] self._can_exit = not wait_before_exit def task(): tid = threading.get_ident() self.started.append(tid) try: f() finally: self.finished.append(tid) while not self._can_exit: _wait() try: for i in range(n): start_new_thread(task, ()) except: self._can_exit = True raise 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 = True class BaseTestCase(unittest.TestCase): def setUp(self): self._threads = support.threading_setup() def tearDown(self): support.threading_cleanup(*self._threads) support.reap_children() def assertTimeout(self, actual, expected): # The waiting and/or time.time() can be imprecise, which # is why comparing to the expected value would sometimes fail # (especially under Windows). self.assertGreaterEqual(actual, expected * 0.6) # Test nothing insane happened self.assertLess(actual, expected * 10.0) class BaseLockTests(BaseTestCase): """ Tests for both recursive and non-recursive locks. """ def test_constructor(self): lock = self.locktype() del lock def test_repr(self): lock = self.locktype() repr(lock) del lock def test_acquire_destroy(self): lock = self.locktype() lock.acquire() del lock def test_acquire_release(self): lock = self.locktype() lock.acquire() lock.release() del lock def test_try_acquire(self): lock = self.locktype() self.assertTrue(lock.acquire(False)) lock.release() def test_try_acquire_contended(self): lock = self.locktype() lock.acquire() result = [] def f(): result.append(lock.acquire(False)) Bunch(f, 1).wait_for_finished() self.assertFalse(result[0]) lock.release() def test_acquire_contended(self): lock = self.locktype() lock.acquire() N = 5 def f(): lock.acquire() lock.release() b = Bunch(f, N) b.wait_for_started() _wait() self.assertEqual(len(b.finished), 0) lock.release() b.wait_for_finished() self.assertEqual(len(b.finished), N) def test_with(self): lock = self.locktype() def f(): lock.acquire() lock.release() def _with(err=None): with lock: if err is not None: raise err _with() # Check the lock is unacquired Bunch(f, 1).wait_for_finished() self.assertRaises(TypeError, _with, TypeError) # Check the lock is unacquired Bunch(f, 1).wait_for_finished() def test_thread_leak(self): # The lock shouldn't leak a Thread instance when used from a foreign # (non-threading) thread. lock = self.locktype() def f(): lock.acquire() lock.release() n = len(threading.enumerate()) # We run many threads in the hope that existing threads ids won't # be recycled. Bunch(f, 15).wait_for_finished() if len(threading.enumerate()) != n: # There is a small window during which a Thread instance's # target function has finished running, but the Thread is still # alive and registered. Avoid spurious failures by waiting a # bit more (seen on a buildbot). time.sleep(0.4) self.assertEqual(n, len(threading.enumerate())) def test_timeout(self): lock = self.locktype() # Can't set timeout if not blocking self.assertRaises(ValueError, lock.acquire, 0, 1) # Invalid timeout values self.assertRaises(ValueError, lock.acquire, timeout=-100) self.assertRaises(OverflowError, lock.acquire, timeout=1e100) self.assertRaises(OverflowError, lock.acquire, timeout=TIMEOUT_MAX + 1) # TIMEOUT_MAX is ok lock.acquire(timeout=TIMEOUT_MAX) lock.release() t1 = time.time() self.assertTrue(lock.acquire(timeout=5)) t2 = time.time() # Just a sanity test that it didn't actually wait for the timeout. self.assertLess(t2 - t1, 5) results = [] def f(): t1 = time.time() results.append(lock.acquire(timeout=0.5)) t2 = time.time() results.append(t2 - t1) Bunch(f, 1).wait_for_finished() self.assertFalse(results[0]) self.assertTimeout(results[1], 0.5) class LockTests(BaseLockTests): """ Tests for non-recursive, weak locks (which can be acquired and released from different threads). """ def test_reacquire(self): # Lock needs to be released before re-acquiring. lock = self.locktype() phase = [] def f(): lock.acquire() phase.append(None) lock.acquire() phase.append(None) start_new_thread(f, ()) while len(phase) == 0: _wait() _wait() self.assertEqual(len(phase), 1) lock.release() while len(phase) == 1: _wait() self.assertEqual(len(phase), 2) def test_different_thread(self): # Lock can be released from a different thread. lock = self.locktype() lock.acquire() def f(): lock.release() b = Bunch(f, 1) b.wait_for_finished() lock.acquire() lock.release() def test_state_after_timeout(self): # Issue #11618: check that lock is in a proper state after a # (non-zero) timeout. lock = self.locktype() lock.acquire() self.assertFalse(lock.acquire(timeout=0.01)) lock.release() self.assertFalse(lock.locked()) self.assertTrue(lock.acquire(blocking=False)) class RLockTests(BaseLockTests): """ Tests for recursive locks. """ def test_reacquire(self): lock = self.locktype() lock.acquire() lock.acquire() lock.release() lock.acquire() lock.release() lock.release() def test_release_unacquired(self): # Cannot release an unacquired lock lock = self.locktype() self.assertRaises(RuntimeError, lock.release) lock.acquire() lock.acquire() lock.release() lock.acquire() lock.release() lock.release() self.assertRaises(RuntimeError, lock.release) def test_release_save_unacquired(self): # Cannot _release_save an unacquired lock lock = self.locktype() self.assertRaises(RuntimeError, lock._release_save) lock.acquire() lock.acquire() lock.release() lock.acquire() lock.release() lock.release() self.assertRaises(RuntimeError, lock._release_save) def test_different_thread(self): # Cannot release from a different thread lock = self.locktype() def f(): lock.acquire() b = Bunch(f, 1, True) try: self.assertRaises(RuntimeError, lock.release) finally: b.do_finish() def test__is_owned(self): lock = self.locktype() self.assertFalse(lock._is_owned()) lock.acquire() self.assertTrue(lock._is_owned()) lock.acquire() self.assertTrue(lock._is_owned()) result = [] def f(): result.append(lock._is_owned()) Bunch(f, 1).wait_for_finished() self.assertFalse(result[0]) lock.release() self.assertTrue(lock._is_owned()) lock.release() self.assertFalse(lock._is_owned()) class EventTests(BaseTestCase): """ Tests for Event objects. """ def test_is_set(self): evt = self.eventtype() self.assertFalse(evt.is_set()) evt.set() self.assertTrue(evt.is_set()) evt.set() self.assertTrue(evt.is_set()) evt.clear() self.assertFalse(evt.is_set()) evt.clear() self.assertFalse(evt.is_set()) def _check_notify(self, evt): # All threads get notified N = 5 results1 = [] results2 = [] def f(): results1.append(evt.wait()) results2.append(evt.wait()) b = Bunch(f, N) b.wait_for_started() _wait() self.assertEqual(len(results1), 0) evt.set() b.wait_for_finished() self.assertEqual(results1, [True] * N) self.assertEqual(results2, [True] * N) def test_notify(self): evt = self.eventtype() self._check_notify(evt) # Another time, after an explicit clear() evt.set() evt.clear() self._check_notify(evt) def test_timeout(self): evt = self.eventtype() results1 = [] results2 = [] N = 5 def f(): results1.append(evt.wait(0.0)) t1 = time.time() r = evt.wait(0.5) t2 = time.time() results2.append((r, t2 - t1)) Bunch(f, N).wait_for_finished() self.assertEqual(results1, [False] * N) for r, dt in results2: self.assertFalse(r) self.assertTimeout(dt, 0.5) # The event is set results1 = [] results2 = [] evt.set() Bunch(f, N).wait_for_finished() self.assertEqual(results1, [True] * N) for r, dt in results2: self.assertTrue(r) def test_set_and_clear(self): # Issue #13502: check that wait() returns true even when the event is # cleared before the waiting thread is woken up. evt = self.eventtype() results = [] N = 5 def f(): results.append(evt.wait(1)) b = Bunch(f, N) b.wait_for_started() time.sleep(0.5) evt.set() evt.clear() b.wait_for_finished() self.assertEqual(results, [True] * N) def test_reset_internal_locks(self): evt = self.eventtype() old_lock = evt._cond._lock evt._reset_internal_locks() new_lock = evt._cond._lock self.assertIsNot(new_lock, old_lock) self.assertIs(type(new_lock), type(old_lock)) class ConditionTests(BaseTestCase): """ Tests for condition variables. """ def test_acquire(self): cond = self.condtype() # Be default we have an RLock: the condition can be acquired multiple # times. cond.acquire() cond.acquire() cond.release() cond.release() lock = threading.Lock() cond = self.condtype(lock) cond.acquire() self.assertFalse(lock.acquire(False)) cond.release() self.assertTrue(lock.acquire(False)) self.assertFalse(cond.acquire(False)) lock.release() with cond: self.assertFalse(lock.acquire(False)) def test_unacquired_wait(self): cond = self.condtype() self.assertRaises(RuntimeError, cond.wait) def test_unacquired_notify(self): cond = self.condtype() self.assertRaises(RuntimeError, cond.notify) def _check_notify(self, cond): # Note that this test is sensitive to timing. If the worker threads # don't execute in a timely fashion, the main thread may think they # are further along then they are. The main thread therefore issues # _wait() statements to try to make sure that it doesn't race ahead # of the workers. # Secondly, this test assumes that condition variables are not subject # to spurious wakeups. The absence of spurious wakeups is an implementation # detail of Condition Cariables in current CPython, but in general, not # a guaranteed property of condition variables as a programming # construct. In particular, it is possible that this can no longer # be conveniently guaranteed should their implementation ever change. N = 5 results1 = [] results2 = [] phase_num = 0 def f(): cond.acquire() result = cond.wait() cond.release() results1.append((result, phase_num)) cond.acquire() result = cond.wait() cond.release() results2.append((result, phase_num)) b = Bunch(f, N) b.wait_for_started() _wait() self.assertEqual(results1, []) # Notify 3 threads at first cond.acquire() cond.notify(3) _wait() phase_num = 1 cond.release() while len(results1) < 3: _wait() self.assertEqual(results1, [(True, 1)] * 3) self.assertEqual(results2, []) # first wait, to ensure all workers settle into cond.wait() before # we continue. See issue #8799 _wait() # Notify 5 threads: they might be in their first or second wait cond.acquire() cond.notify(5) _wait() phase_num = 2 cond.release() while len(results1) + len(results2) < 8: _wait() self.assertEqual(results1, [(True, 1)] * 3 + [(True, 2)] * 2) self.assertEqual(results2, [(True, 2)] * 3) _wait() # make sure all workers settle into cond.wait() # Notify all threads: they are all in their second wait cond.acquire() cond.notify_all() _wait() phase_num = 3 cond.release() while len(results2) < 5: _wait() self.assertEqual(results1, [(True, 1)] * 3 + [(True,2)] * 2) self.assertEqual(results2, [(True, 2)] * 3 + [(True, 3)] * 2) b.wait_for_finished() def test_notify(self): cond = self.condtype() self._check_notify(cond) # A second time, to check internal state is still ok. self._check_notify(cond) def test_timeout(self): cond = self.condtype() results = [] N = 5 def f(): cond.acquire() t1 = time.time() result = cond.wait(0.5) t2 = time.time() cond.release() results.append((t2 - t1, result)) Bunch(f, N).wait_for_finished() self.assertEqual(len(results), N) for dt, result in results: self.assertTimeout(dt, 0.5) # Note that conceptually (that"s the condition variable protocol) # a wait() may succeed even if no one notifies us and before any # timeout occurs. Spurious wakeups can occur. # This makes it hard to verify the result value. # In practice, this implementation has no spurious wakeups. self.assertFalse(result) def test_waitfor(self): cond = self.condtype() state = 0 def f(): with cond: result = cond.wait_for(lambda : state==4) self.assertTrue(result) self.assertEqual(state, 4) b = Bunch(f, 1) b.wait_for_started() for i in range(4): time.sleep(0.01) with cond: state += 1 cond.notify() b.wait_for_finished() def test_waitfor_timeout(self): cond = self.condtype() state = 0 success = [] def f(): with cond: dt = time.time() result = cond.wait_for(lambda : state==4, timeout=0.1) dt = time.time() - dt self.assertFalse(result) self.assertTimeout(dt, 0.1) success.append(None) b = Bunch(f, 1) b.wait_for_started() # Only increment 3 times, so state == 4 is never reached. for i in range(3): time.sleep(0.01) with cond: state += 1 cond.notify() b.wait_for_finished() self.assertEqual(len(success), 1) class BaseSemaphoreTests(BaseTestCase): """ Common tests for {bounded, unbounded} semaphore objects. """ def test_constructor(self): self.assertRaises(ValueError, self.semtype, value = -1) self.assertRaises(ValueError, self.semtype, value = -sys.maxsize) def test_acquire(self): sem = self.semtype(1) sem.acquire() sem.release() sem = self.semtype(2) sem.acquire() sem.acquire() sem.release() sem.release() def test_acquire_destroy(self): sem = self.semtype() sem.acquire() del sem def test_acquire_contended(self): sem = self.semtype(7) sem.acquire() N = 10 results1 = [] results2 = [] phase_num = 0 def f(): sem.acquire() results1.append(phase_num) sem.acquire() results2.append(phase_num) b = Bunch(f, 10) b.wait_for_started() while len(results1) + len(results2) < 6: _wait() self.assertEqual(results1 + results2, [0] * 6) phase_num = 1 for i in range(7): sem.release() while len(results1) + len(results2) < 13: _wait() self.assertEqual(sorted(results1 + results2), [0] * 6 + [1] * 7) phase_num = 2 for i in range(6): sem.release() while len(results1) + len(results2) < 19: _wait() self.assertEqual(sorted(results1 + results2), [0] * 6 + [1] * 7 + [2] * 6) # The semaphore is still locked self.assertFalse(sem.acquire(False)) # Final release, to let the last thread finish sem.release() b.wait_for_finished() def test_try_acquire(self): sem = self.semtype(2) self.assertTrue(sem.acquire(False)) self.assertTrue(sem.acquire(False)) self.assertFalse(sem.acquire(False)) sem.release() self.assertTrue(sem.acquire(False)) def test_try_acquire_contended(self): sem = self.semtype(4) sem.acquire() results = [] def f(): results.append(sem.acquire(False)) results.append(sem.acquire(False)) Bunch(f, 5).wait_for_finished() # There can be a thread switch between acquiring the semaphore and # appending the result, therefore results will not necessarily be # ordered. self.assertEqual(sorted(results), [False] * 7 + [True] * 3 ) def test_acquire_timeout(self): sem = self.semtype(2) self.assertRaises(ValueError, sem.acquire, False, timeout=1.0) self.assertTrue(sem.acquire(timeout=0.005)) self.assertTrue(sem.acquire(timeout=0.005)) self.assertFalse(sem.acquire(timeout=0.005)) sem.release() self.assertTrue(sem.acquire(timeout=0.005)) t = time.time() self.assertFalse(sem.acquire(timeout=0.5)) dt = time.time() - t self.assertTimeout(dt, 0.5) def test_default_value(self): # The default initial value is 1. sem = self.semtype() sem.acquire() def f(): sem.acquire() sem.release() b = Bunch(f, 1) b.wait_for_started() _wait() self.assertFalse(b.finished) sem.release() b.wait_for_finished() def test_with(self): sem = self.semtype(2) def _with(err=None): with sem: self.assertTrue(sem.acquire(False)) sem.release() with sem: self.assertFalse(sem.acquire(False)) if err: raise err _with() self.assertTrue(sem.acquire(False)) sem.release() self.assertRaises(TypeError, _with, TypeError) self.assertTrue(sem.acquire(False)) sem.release() class SemaphoreTests(BaseSemaphoreTests): """ Tests for unbounded semaphores. """ def test_release_unacquired(self): # Unbounded releases are allowed and increment the semaphore's value sem = self.semtype(1) sem.release() sem.acquire() sem.acquire() sem.release() class BoundedSemaphoreTests(BaseSemaphoreTests): """ Tests for bounded semaphores. """ def test_release_unacquired(self): # Cannot go past the initial value sem = self.semtype() self.assertRaises(ValueError, sem.release) sem.acquire() sem.release() self.assertRaises(ValueError, sem.release) class BarrierTests(BaseTestCase): """ Tests for Barrier objects. """ N = 5 defaultTimeout = 2.0 def setUp(self): self.barrier = self.barriertype(self.N, timeout=self.defaultTimeout) def tearDown(self): self.barrier.abort() def run_threads(self, f): b = Bunch(f, self.N-1) f() b.wait_for_finished() def multipass(self, results, n): m = self.barrier.parties self.assertEqual(m, self.N) for i in range(n): results[0].append(True) self.assertEqual(len(results[1]), i * m) self.barrier.wait() results[1].append(True) self.assertEqual(len(results[0]), (i + 1) * m) self.barrier.wait() self.assertEqual(self.barrier.n_waiting, 0) self.assertFalse(self.barrier.broken) def test_barrier(self, passes=1): """ Test that a barrier is passed in lockstep """ results = [[],[]] def f(): self.multipass(results, passes) self.run_threads(f) def test_barrier_10(self): """ Test that a barrier works for 10 consecutive runs """ return self.test_barrier(10) def test_wait_return(self): """ test the return value from barrier.wait """ results = [] def f(): r = self.barrier.wait() results.append(r) self.run_threads(f) self.assertEqual(sum(results), sum(range(self.N))) def test_action(self): """ Test the 'action' callback """ results = [] def action(): results.append(True) barrier = self.barriertype(self.N, action) def f(): barrier.wait() self.assertEqual(len(results), 1) self.run_threads(f) def test_abort(self): """ Test that an abort will put the barrier in a broken state """ results1 = [] results2 = [] def f(): try: i = self.barrier.wait() if i == self.N//2: raise RuntimeError self.barrier.wait() results1.append(True) except threading.BrokenBarrierError: results2.append(True) except RuntimeError: self.barrier.abort() pass self.run_threads(f) self.assertEqual(len(results1), 0) self.assertEqual(len(results2), self.N-1) self.assertTrue(self.barrier.broken) def test_reset(self): """ Test that a 'reset' on a barrier frees the waiting threads """ results1 = [] results2 = [] results3 = [] def f(): i = self.barrier.wait() if i == self.N//2: # Wait until the other threads are all in the barrier. while self.barrier.n_waiting < self.N-1: time.sleep(0.001) self.barrier.reset() else: try: self.barrier.wait() results1.append(True) except threading.BrokenBarrierError: results2.append(True) # Now, pass the barrier again self.barrier.wait() results3.append(True) self.run_threads(f) self.assertEqual(len(results1), 0) self.assertEqual(len(results2), self.N-1) self.assertEqual(len(results3), self.N) def test_abort_and_reset(self): """ Test that a barrier can be reset after being broken. """ results1 = [] results2 = [] results3 = [] barrier2 = self.barriertype(self.N) def f(): try: i = self.barrier.wait() if i == self.N//2: raise RuntimeError self.barrier.wait() results1.append(True) except threading.BrokenBarrierError: results2.append(True) except RuntimeError: self.barrier.abort() pass # 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() == self.N//2: self.barrier.reset() barrier2.wait() self.barrier.wait() results3.append(True) self.run_threads(f) self.assertEqual(len(results1), 0) self.assertEqual(len(results2), self.N-1) self.assertEqual(len(results3), self.N) def test_timeout(self): """ Test wait(timeout) """ def f(): i = self.barrier.wait() if i == self.N // 2: # One thread is late! time.sleep(1.0) # Default timeout is 2.0, so this is shorter. self.assertRaises(threading.BrokenBarrierError, self.barrier.wait, 0.5) self.run_threads(f) def test_default_timeout(self): """ Test the barrier's default timeout """ # create a barrier with a low default timeout barrier = self.barriertype(self.N, timeout=0.3) def f(): i = barrier.wait() if i == self.N // 2: # One thread is later than the default timeout of 0.3s. time.sleep(1.0) self.assertRaises(threading.BrokenBarrierError, barrier.wait) self.run_threads(f) def test_single_thread(self): b = self.barriertype(1) b.wait() b.wait()