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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ"""Tests for lock.py""" import unittest from unittest import mock import re import asyncio STR_RGX_REPR = ( r'^<(?P.*?) object at (?P
.*?)' r'\[(?P' r'(set|unset|locked|unlocked)(, value:\d)?(, waiters:\d+)?' r')\]>\Z' ) RGX_REPR = re.compile(STR_RGX_REPR) def tearDownModule(): asyncio.set_event_loop_policy(None) class LockTests(unittest.IsolatedAsyncioTestCase): async def test_ctor_loop(self): loop = mock.Mock() with self.assertWarns(DeprecationWarning): lock = asyncio.Lock(loop=loop) self.assertIs(lock._loop, loop) with self.assertWarns(DeprecationWarning): lock = asyncio.Lock(loop=asyncio.get_running_loop()) self.assertIs(lock._loop, asyncio.get_running_loop()) async def test_ctor_noloop(self): lock = asyncio.Lock() self.assertIs(lock._loop, asyncio.get_running_loop()) async def test_repr(self): with self.assertWarns(DeprecationWarning): lock = asyncio.Lock(loop=asyncio.get_running_loop()) self.assertTrue(repr(lock).endswith('[unlocked]>')) self.assertTrue(RGX_REPR.match(repr(lock))) await lock.acquire() self.assertTrue(repr(lock).endswith('[locked]>')) self.assertTrue(RGX_REPR.match(repr(lock))) async def test_lock(self): lock = asyncio.Lock() with self.assertRaisesRegex( TypeError, "object Lock can't be used in 'await' expression" ): await lock self.assertFalse(lock.locked()) async def test_lock_by_with_statement(self): primitives = [ asyncio.Lock(), asyncio.Condition(), asyncio.Semaphore(), asyncio.BoundedSemaphore(), ] for lock in primitives: await asyncio.sleep(0.01) self.assertFalse(lock.locked()) with self.assertRaisesRegex( TypeError, r"object \w+ can't be used in 'await' expression" ): with await lock: pass self.assertFalse(lock.locked()) async def test_acquire(self): lock = asyncio.Lock() result = [] self.assertTrue(await lock.acquire()) async def c1(result): if await lock.acquire(): result.append(1) return True async def c2(result): if await lock.acquire(): result.append(2) return True async def c3(result): if await lock.acquire(): result.append(3) return True t1 = asyncio.create_task(c1(result)) t2 = asyncio.create_task(c2(result)) await asyncio.sleep(0) self.assertEqual([], result) lock.release() await asyncio.sleep(0) self.assertEqual([1], result) await asyncio.sleep(0) self.assertEqual([1], result) t3 = asyncio.create_task(c3(result)) lock.release() await asyncio.sleep(0) self.assertEqual([1, 2], result) lock.release() await asyncio.sleep(0) self.assertEqual([1, 2, 3], result) self.assertTrue(t1.done()) self.assertTrue(t1.result()) self.assertTrue(t2.done()) self.assertTrue(t2.result()) self.assertTrue(t3.done()) self.assertTrue(t3.result()) async def test_acquire_cancel(self): with self.assertWarns(DeprecationWarning): lock = asyncio.Lock(loop=asyncio.get_running_loop()) self.assertTrue(await lock.acquire()) task = asyncio.create_task(lock.acquire()) asyncio.get_running_loop().call_soon(task.cancel) with self.assertRaises(asyncio.CancelledError): await task self.assertFalse(lock._waiters) async def test_cancel_race(self): # Several tasks: # - A acquires the lock # - B is blocked in acquire() # - C is blocked in acquire() # # Now, concurrently: # - B is cancelled # - A releases the lock # # If B's waiter is marked cancelled but not yet removed from # _waiters, A's release() call will crash when trying to set # B's waiter; instead, it should move on to C's waiter. # Setup: A has the lock, b and c are waiting. with self.assertWarns(DeprecationWarning): lock = asyncio.Lock(loop=asyncio.get_running_loop()) async def lockit(name, blocker): await lock.acquire() try: if blocker is not None: await blocker finally: lock.release() fa = asyncio.get_running_loop().create_future() ta = asyncio.create_task(lockit('A', fa)) await asyncio.sleep(0) self.assertTrue(lock.locked()) tb = asyncio.create_task(lockit('B', None)) await asyncio.sleep(0) self.assertEqual(len(lock._waiters), 1) tc = asyncio.create_task(lockit('C', None)) await asyncio.sleep(0) self.assertEqual(len(lock._waiters), 2) # Create the race and check. # Without the fix this failed at the last assert. fa.set_result(None) tb.cancel() self.assertTrue(lock._waiters[0].cancelled()) await asyncio.sleep(0) self.assertFalse(lock.locked()) self.assertTrue(ta.done()) self.assertTrue(tb.cancelled()) await tc async def test_cancel_release_race(self): # Issue 32734 # Acquire 4 locks, cancel second, release first # and 2 locks are taken at once. loop = asyncio.get_running_loop() with self.assertWarns(DeprecationWarning): lock = asyncio.Lock(loop=loop) lock_count = 0 call_count = 0 async def lockit(): nonlocal lock_count nonlocal call_count call_count += 1 await lock.acquire() lock_count += 1 def trigger(): t1.cancel() lock.release() await lock.acquire() t1 = asyncio.create_task(lockit()) t2 = asyncio.create_task(lockit()) t3 = asyncio.create_task(lockit()) # Start scheduled tasks await asyncio.sleep(0) loop.call_soon(trigger) with self.assertRaises(asyncio.CancelledError): # Wait for cancellation await t1 # Make sure only one lock was taken self.assertEqual(lock_count, 1) # While 3 calls were made to lockit() self.assertEqual(call_count, 3) self.assertTrue(t1.cancelled() and t2.done()) # Cleanup the task that is stuck on acquire. t3.cancel() await asyncio.sleep(0) self.assertTrue(t3.cancelled()) async def test_finished_waiter_cancelled(self): with self.assertWarns(DeprecationWarning): lock = asyncio.Lock(loop=asyncio.get_running_loop()) await lock.acquire() self.assertTrue(lock.locked()) tb = asyncio.create_task(lock.acquire()) await asyncio.sleep(0) self.assertEqual(len(lock._waiters), 1) # Create a second waiter, wake up the first, and cancel it. # Without the fix, the second was not woken up. tc = asyncio.create_task(lock.acquire()) tb.cancel() lock.release() await asyncio.sleep(0) self.assertTrue(lock.locked()) self.assertTrue(tb.cancelled()) # Cleanup await tc async def test_release_not_acquired(self): with self.assertWarns(DeprecationWarning): lock = asyncio.Lock(loop=asyncio.get_running_loop()) self.assertRaises(RuntimeError, lock.release) async def test_release_no_waiters(self): with self.assertWarns(DeprecationWarning): lock = asyncio.Lock(loop=asyncio.get_running_loop()) await lock.acquire() self.assertTrue(lock.locked()) lock.release() self.assertFalse(lock.locked()) async def test_context_manager(self): lock = asyncio.Lock() self.assertFalse(lock.locked()) async with lock: self.assertTrue(lock.locked()) self.assertFalse(lock.locked()) class EventTests(unittest.IsolatedAsyncioTestCase): async def test_ctor_loop(self): loop = mock.Mock() with self.assertWarns(DeprecationWarning): ev = asyncio.Event(loop=loop) self.assertIs(ev._loop, loop) with self.assertWarns(DeprecationWarning): ev = asyncio.Event(loop=asyncio.get_running_loop()) self.assertIs(ev._loop, asyncio.get_running_loop()) async def test_ctor_noloop(self): asyncio.set_event_loop(asyncio.get_running_loop()) ev = asyncio.Event() self.assertIs(ev._loop, asyncio.get_running_loop()) async def test_repr(self): with self.assertWarns(DeprecationWarning): ev = asyncio.Event(loop=asyncio.get_running_loop()) self.assertTrue(repr(ev).endswith('[unset]>')) match = RGX_REPR.match(repr(ev)) self.assertEqual(match.group('extras'), 'unset') ev.set() self.assertTrue(repr(ev).endswith('[set]>')) self.assertTrue(RGX_REPR.match(repr(ev))) ev._waiters.append(mock.Mock()) self.assertTrue('waiters:1' in repr(ev)) self.assertTrue(RGX_REPR.match(repr(ev))) async def test_wait(self): with self.assertWarns(DeprecationWarning): ev = asyncio.Event(loop=asyncio.get_running_loop()) self.assertFalse(ev.is_set()) result = [] async def c1(result): if await ev.wait(): result.append(1) async def c2(result): if await ev.wait(): result.append(2) async def c3(result): if await ev.wait(): result.append(3) t1 = asyncio.create_task(c1(result)) t2 = asyncio.create_task(c2(result)) await asyncio.sleep(0) self.assertEqual([], result) t3 = asyncio.create_task(c3(result)) ev.set() await asyncio.sleep(0) self.assertEqual([3, 1, 2], result) self.assertTrue(t1.done()) self.assertIsNone(t1.result()) self.assertTrue(t2.done()) self.assertIsNone(t2.result()) self.assertTrue(t3.done()) self.assertIsNone(t3.result()) async def test_wait_on_set(self): ev = asyncio.Event() ev.set() res = await ev.wait() self.assertTrue(res) async def test_wait_cancel(self): ev = asyncio.Event() wait = asyncio.create_task(ev.wait()) asyncio.get_running_loop().call_soon(wait.cancel) with self.assertRaises(asyncio.CancelledError): await wait self.assertFalse(ev._waiters) async def test_clear(self): ev = asyncio.Event() self.assertFalse(ev.is_set()) ev.set() self.assertTrue(ev.is_set()) ev.clear() self.assertFalse(ev.is_set()) async def test_clear_with_waiters(self): ev = asyncio.Event() result = [] async def c1(result): if await ev.wait(): result.append(1) return True t = asyncio.create_task(c1(result)) await asyncio.sleep(0) self.assertEqual([], result) ev.set() ev.clear() self.assertFalse(ev.is_set()) ev.set() ev.set() self.assertEqual(1, len(ev._waiters)) await asyncio.sleep(0) self.assertEqual([1], result) self.assertEqual(0, len(ev._waiters)) self.assertTrue(t.done()) self.assertTrue(t.result()) class ConditionTests(unittest.IsolatedAsyncioTestCase): async def test_ctor_loop(self): loop = mock.Mock() with self.assertWarns(DeprecationWarning): cond = asyncio.Condition(loop=loop) self.assertIs(cond._loop, loop) cond = asyncio.Condition(loop=asyncio.get_running_loop()) self.assertIs(cond._loop, asyncio.get_running_loop()) async def test_ctor_noloop(self): cond = asyncio.Condition() self.assertIs(cond._loop, asyncio.get_running_loop()) async def test_wait(self): cond = asyncio.Condition() result = [] async def c1(result): await cond.acquire() if await cond.wait(): result.append(1) return True async def c2(result): await cond.acquire() if await cond.wait(): result.append(2) return True async def c3(result): await cond.acquire() if await cond.wait(): result.append(3) return True t1 = asyncio.create_task(c1(result)) t2 = asyncio.create_task(c2(result)) t3 = asyncio.create_task(c3(result)) await asyncio.sleep(0) self.assertEqual([], result) self.assertFalse(cond.locked()) self.assertTrue(await cond.acquire()) cond.notify() await asyncio.sleep(0) self.assertEqual([], result) self.assertTrue(cond.locked()) cond.release() await asyncio.sleep(0) self.assertEqual([1], result) self.assertTrue(cond.locked()) cond.notify(2) await asyncio.sleep(0) self.assertEqual([1], result) self.assertTrue(cond.locked()) cond.release() await asyncio.sleep(0) self.assertEqual([1, 2], result) self.assertTrue(cond.locked()) cond.release() await asyncio.sleep(0) self.assertEqual([1, 2, 3], result) self.assertTrue(cond.locked()) self.assertTrue(t1.done()) self.assertTrue(t1.result()) self.assertTrue(t2.done()) self.assertTrue(t2.result()) self.assertTrue(t3.done()) self.assertTrue(t3.result()) async def test_wait_cancel(self): cond = asyncio.Condition() await cond.acquire() wait = asyncio.create_task(cond.wait()) asyncio.get_running_loop().call_soon(wait.cancel) with self.assertRaises(asyncio.CancelledError): await wait self.assertFalse(cond._waiters) self.assertTrue(cond.locked()) async def test_wait_cancel_contested(self): cond = asyncio.Condition() await cond.acquire() self.assertTrue(cond.locked()) wait_task = asyncio.create_task(cond.wait()) await asyncio.sleep(0) self.assertFalse(cond.locked()) # Notify, but contest the lock before cancelling await cond.acquire() self.assertTrue(cond.locked()) cond.notify() asyncio.get_running_loop().call_soon(wait_task.cancel) asyncio.get_running_loop().call_soon(cond.release) try: await wait_task except asyncio.CancelledError: # Should not happen, since no cancellation points pass self.assertTrue(cond.locked()) async def test_wait_cancel_after_notify(self): # See bpo-32841 with self.assertWarns(DeprecationWarning): cond = asyncio.Condition(loop=asyncio.get_running_loop()) waited = False async def wait_on_cond(): nonlocal waited async with cond: waited = True # Make sure this area was reached await cond.wait() waiter = asyncio.create_task(wait_on_cond()) await asyncio.sleep(0) # Start waiting await cond.acquire() cond.notify() await asyncio.sleep(0) # Get to acquire() waiter.cancel() await asyncio.sleep(0) # Activate cancellation cond.release() await asyncio.sleep(0) # Cancellation should occur self.assertTrue(waiter.cancelled()) self.assertTrue(waited) async def test_wait_unacquired(self): cond = asyncio.Condition() with self.assertRaises(RuntimeError): await cond.wait() async def test_wait_for(self): cond = asyncio.Condition() presult = False def predicate(): return presult result = [] async def c1(result): await cond.acquire() if await cond.wait_for(predicate): result.append(1) cond.release() return True t = asyncio.create_task(c1(result)) await asyncio.sleep(0) self.assertEqual([], result) await cond.acquire() cond.notify() cond.release() await asyncio.sleep(0) self.assertEqual([], result) presult = True await cond.acquire() cond.notify() cond.release() await asyncio.sleep(0) self.assertEqual([1], result) self.assertTrue(t.done()) self.assertTrue(t.result()) async def test_wait_for_unacquired(self): cond = asyncio.Condition() # predicate can return true immediately res = await cond.wait_for(lambda: [1, 2, 3]) self.assertEqual([1, 2, 3], res) with self.assertRaises(RuntimeError): await cond.wait_for(lambda: False) async def test_notify(self): cond = asyncio.Condition() result = [] async def c1(result): await cond.acquire() if await cond.wait(): result.append(1) cond.release() return True async def c2(result): await cond.acquire() if await cond.wait(): result.append(2) cond.release() return True async def c3(result): await cond.acquire() if await cond.wait(): result.append(3) cond.release() return True t1 = asyncio.create_task(c1(result)) t2 = asyncio.create_task(c2(result)) t3 = asyncio.create_task(c3(result)) await asyncio.sleep(0) self.assertEqual([], result) await cond.acquire() cond.notify(1) cond.release() await asyncio.sleep(0) self.assertEqual([1], result) await cond.acquire() cond.notify(1) cond.notify(2048) cond.release() await asyncio.sleep(0) self.assertEqual([1, 2, 3], result) self.assertTrue(t1.done()) self.assertTrue(t1.result()) self.assertTrue(t2.done()) self.assertTrue(t2.result()) self.assertTrue(t3.done()) self.assertTrue(t3.result()) async def test_notify_all(self): cond = asyncio.Condition() result = [] async def c1(result): await cond.acquire() if await cond.wait(): result.append(1) cond.release() return True async def c2(result): await cond.acquire() if await cond.wait(): result.append(2) cond.release() return True t1 = asyncio.create_task(c1(result)) t2 = asyncio.create_task(c2(result)) await asyncio.sleep(0) self.assertEqual([], result) await cond.acquire() cond.notify_all() cond.release() await asyncio.sleep(0) self.assertEqual([1, 2], result) self.assertTrue(t1.done()) self.assertTrue(t1.result()) self.assertTrue(t2.done()) self.assertTrue(t2.result()) def test_notify_unacquired(self): cond = asyncio.Condition() self.assertRaises(RuntimeError, cond.notify) def test_notify_all_unacquired(self): cond = asyncio.Condition() self.assertRaises(RuntimeError, cond.notify_all) async def test_repr(self): cond = asyncio.Condition() self.assertTrue('unlocked' in repr(cond)) self.assertTrue(RGX_REPR.match(repr(cond))) await cond.acquire() self.assertTrue('locked' in repr(cond)) cond._waiters.append(mock.Mock()) self.assertTrue('waiters:1' in repr(cond)) self.assertTrue(RGX_REPR.match(repr(cond))) cond._waiters.append(mock.Mock()) self.assertTrue('waiters:2' in repr(cond)) self.assertTrue(RGX_REPR.match(repr(cond))) async def test_context_manager(self): cond = asyncio.Condition() self.assertFalse(cond.locked()) async with cond: self.assertTrue(cond.locked()) self.assertFalse(cond.locked()) async def test_explicit_lock(self): async def f(lock=None, cond=None): if lock is None: lock = asyncio.Lock() if cond is None: cond = asyncio.Condition(lock) self.assertIs(cond._lock, lock) self.assertFalse(lock.locked()) self.assertFalse(cond.locked()) async with cond: self.assertTrue(lock.locked()) self.assertTrue(cond.locked()) self.assertFalse(lock.locked()) self.assertFalse(cond.locked()) async with lock: self.assertTrue(lock.locked()) self.assertTrue(cond.locked()) self.assertFalse(lock.locked()) self.assertFalse(cond.locked()) # All should work in the same way. await f() await f(asyncio.Lock()) lock = asyncio.Lock() await f(lock, asyncio.Condition(lock)) async def test_ambiguous_loops(self): loop = asyncio.new_event_loop() self.addCleanup(loop.close) async def wrong_loop_in_lock(): with self.assertWarns(DeprecationWarning): asyncio.Lock(loop=loop) lock = asyncio.Lock() lock._loop = loop # use private API for testing async with lock: # acquired immediately via the fast-path # without interaction with any event loop. # cond.acquire() will trigger waiting on the lock # and it will discover the event loop mismatch. with self.assertRaisesRegex( ValueError, "loop argument must agree with lock", ): asyncio.Condition(lock) async def wrong_loop_in_cond(): # Same analogy here with the condition's loop. lock = asyncio.Lock() async with lock: with self.assertRaisesRegex( ValueError, "loop argument must agree with lock" ): with self.assertWarns(DeprecationWarning): asyncio.Condition(lock, loop=loop) await wrong_loop_in_lock() await wrong_loop_in_cond() async def test_timeout_in_block(self): condition = asyncio.Condition() async with condition: with self.assertRaises(asyncio.TimeoutError): await asyncio.wait_for(condition.wait(), timeout=0.5) class SemaphoreTests(unittest.IsolatedAsyncioTestCase): async def test_ctor_loop(self): loop = mock.Mock() with self.assertWarns(DeprecationWarning): sem = asyncio.Semaphore(loop=loop) self.assertIs(sem._loop, loop) with self.assertWarns(DeprecationWarning): sem = asyncio.Semaphore(loop=asyncio.get_running_loop()) self.assertIs(sem._loop, asyncio.get_running_loop()) async def test_ctor_noloop(self): sem = asyncio.Semaphore() self.assertIs(sem._loop, asyncio.get_running_loop()) async def test_initial_value_zero(self): with self.assertWarns(DeprecationWarning): sem = asyncio.Semaphore(0, loop=asyncio.get_running_loop()) self.assertTrue(sem.locked()) async def test_repr(self): sem = asyncio.Semaphore() self.assertTrue(repr(sem).endswith('[unlocked, value:1]>')) self.assertTrue(RGX_REPR.match(repr(sem))) await sem.acquire() self.assertTrue(repr(sem).endswith('[locked]>')) self.assertTrue('waiters' not in repr(sem)) self.assertTrue(RGX_REPR.match(repr(sem))) sem._waiters.append(mock.Mock()) self.assertTrue('waiters:1' in repr(sem)) self.assertTrue(RGX_REPR.match(repr(sem))) sem._waiters.append(mock.Mock()) self.assertTrue('waiters:2' in repr(sem)) self.assertTrue(RGX_REPR.match(repr(sem))) async def test_semaphore(self): sem = asyncio.Semaphore() self.assertEqual(1, sem._value) with self.assertRaisesRegex( TypeError, "object Semaphore can't be used in 'await' expression", ): await sem self.assertFalse(sem.locked()) self.assertEqual(1, sem._value) def test_semaphore_value(self): self.assertRaises(ValueError, asyncio.Semaphore, -1) async def test_acquire(self): sem = asyncio.Semaphore(3) result = [] self.assertTrue(await sem.acquire()) self.assertTrue(await sem.acquire()) self.assertFalse(sem.locked()) async def c1(result): await sem.acquire() result.append(1) return True async def c2(result): await sem.acquire() result.append(2) return True async def c3(result): await sem.acquire() result.append(3) return True async def c4(result): await sem.acquire() result.append(4) return True t1 = asyncio.create_task(c1(result)) t2 = asyncio.create_task(c2(result)) t3 = asyncio.create_task(c3(result)) await asyncio.sleep(0) self.assertEqual([1], result) self.assertTrue(sem.locked()) self.assertEqual(2, len(sem._waiters)) self.assertEqual(0, sem._value) t4 = asyncio.create_task(c4(result)) sem.release() sem.release() self.assertEqual(2, sem._value) await asyncio.sleep(0) self.assertEqual(0, sem._value) self.assertEqual(3, len(result)) self.assertTrue(sem.locked()) self.assertEqual(1, len(sem._waiters)) self.assertEqual(0, sem._value) self.assertTrue(t1.done()) self.assertTrue(t1.result()) race_tasks = [t2, t3, t4] done_tasks = [t for t in race_tasks if t.done() and t.result()] self.assertTrue(2, len(done_tasks)) # cleanup locked semaphore sem.release() await asyncio.gather(*race_tasks) async def test_acquire_cancel(self): sem = asyncio.Semaphore() await sem.acquire() acquire = asyncio.create_task(sem.acquire()) asyncio.get_running_loop().call_soon(acquire.cancel) with self.assertRaises(asyncio.CancelledError): await acquire self.assertTrue((not sem._waiters) or all(waiter.done() for waiter in sem._waiters)) async def test_acquire_cancel_before_awoken(self): sem = asyncio.Semaphore(value=0) t1 = asyncio.create_task(sem.acquire()) t2 = asyncio.create_task(sem.acquire()) t3 = asyncio.create_task(sem.acquire()) t4 = asyncio.create_task(sem.acquire()) await asyncio.sleep(0) t1.cancel() t2.cancel() sem.release() await asyncio.sleep(0) num_done = sum(t.done() for t in [t3, t4]) self.assertEqual(num_done, 1) self.assertTrue(t3.done()) self.assertFalse(t4.done()) t3.cancel() t4.cancel() await asyncio.sleep(0) async def test_acquire_hang(self): sem = asyncio.Semaphore(value=0) t1 = asyncio.create_task(sem.acquire()) t2 = asyncio.create_task(sem.acquire()) await asyncio.sleep(0) t1.cancel() sem.release() await asyncio.sleep(0) self.assertTrue(sem.locked()) self.assertTrue(t2.done()) async def test_release_not_acquired(self): with self.assertWarns(DeprecationWarning): sem = asyncio.BoundedSemaphore(loop=asyncio.get_running_loop()) self.assertRaises(ValueError, sem.release) async def test_release_no_waiters(self): sem = asyncio.Semaphore() await sem.acquire() self.assertTrue(sem.locked()) sem.release() self.assertFalse(sem.locked()) async def test_acquire_fifo_order(self): sem = asyncio.Semaphore(1) result = [] async def coro(tag): await sem.acquire() result.append(f'{tag}_1') await asyncio.sleep(0.01) sem.release() await sem.acquire() result.append(f'{tag}_2') await asyncio.sleep(0.01) sem.release() t1 = asyncio.create_task(coro('c1')) t2 = asyncio.create_task(coro('c2')) t3 = asyncio.create_task(coro('c3')) await asyncio.gather(t1, t2, t3) self.assertEqual( ['c1_1', 'c2_1', 'c3_1', 'c1_2', 'c2_2', 'c3_2'], result ) if __name__ == '__main__': unittest.main()