mirror of
https://github.com/python/cpython.git
synced 2025-10-31 13:41:24 +00:00
966 lines
28 KiB
Python
966 lines
28 KiB
Python
"""Tests for lock.py"""
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import unittest
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from unittest import mock
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import re
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import asyncio
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STR_RGX_REPR = (
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r'^<(?P<class>.*?) object at (?P<address>.*?)'
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r'\[(?P<extras>'
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r'(set|unset|locked|unlocked)(, value:\d)?(, waiters:\d+)?'
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r')\]>\Z'
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)
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RGX_REPR = re.compile(STR_RGX_REPR)
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def tearDownModule():
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asyncio.set_event_loop_policy(None)
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class LockTests(unittest.IsolatedAsyncioTestCase):
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async def test_ctor_loop(self):
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loop = mock.Mock()
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with self.assertWarns(DeprecationWarning):
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lock = asyncio.Lock(loop=loop)
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self.assertIs(lock._loop, loop)
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with self.assertWarns(DeprecationWarning):
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lock = asyncio.Lock(loop=asyncio.get_running_loop())
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self.assertIs(lock._loop, asyncio.get_running_loop())
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async def test_ctor_noloop(self):
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lock = asyncio.Lock()
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self.assertIs(lock._loop, asyncio.get_running_loop())
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async def test_repr(self):
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with self.assertWarns(DeprecationWarning):
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lock = asyncio.Lock(loop=asyncio.get_running_loop())
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self.assertTrue(repr(lock).endswith('[unlocked]>'))
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self.assertTrue(RGX_REPR.match(repr(lock)))
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await lock.acquire()
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self.assertTrue(repr(lock).endswith('[locked]>'))
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self.assertTrue(RGX_REPR.match(repr(lock)))
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async def test_lock(self):
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lock = asyncio.Lock()
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with self.assertRaisesRegex(
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TypeError,
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"object Lock can't be used in 'await' expression"
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):
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await lock
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self.assertFalse(lock.locked())
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async def test_lock_by_with_statement(self):
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primitives = [
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asyncio.Lock(),
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asyncio.Condition(),
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asyncio.Semaphore(),
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asyncio.BoundedSemaphore(),
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]
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for lock in primitives:
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await asyncio.sleep(0.01)
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self.assertFalse(lock.locked())
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with self.assertRaisesRegex(
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TypeError,
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r"object \w+ can't be used in 'await' expression"
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):
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with await lock:
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pass
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self.assertFalse(lock.locked())
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async def test_acquire(self):
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lock = asyncio.Lock()
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result = []
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self.assertTrue(await lock.acquire())
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async def c1(result):
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if await lock.acquire():
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result.append(1)
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return True
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async def c2(result):
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if await lock.acquire():
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result.append(2)
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return True
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async def c3(result):
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if await lock.acquire():
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result.append(3)
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return True
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t1 = asyncio.create_task(c1(result))
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t2 = asyncio.create_task(c2(result))
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await asyncio.sleep(0)
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self.assertEqual([], result)
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lock.release()
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await asyncio.sleep(0)
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self.assertEqual([1], result)
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await asyncio.sleep(0)
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self.assertEqual([1], result)
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t3 = asyncio.create_task(c3(result))
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lock.release()
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await asyncio.sleep(0)
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self.assertEqual([1, 2], result)
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lock.release()
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await asyncio.sleep(0)
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self.assertEqual([1, 2, 3], result)
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self.assertTrue(t1.done())
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self.assertTrue(t1.result())
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self.assertTrue(t2.done())
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self.assertTrue(t2.result())
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self.assertTrue(t3.done())
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self.assertTrue(t3.result())
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async def test_acquire_cancel(self):
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with self.assertWarns(DeprecationWarning):
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lock = asyncio.Lock(loop=asyncio.get_running_loop())
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self.assertTrue(await lock.acquire())
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task = asyncio.create_task(lock.acquire())
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asyncio.get_running_loop().call_soon(task.cancel)
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with self.assertRaises(asyncio.CancelledError):
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await task
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self.assertFalse(lock._waiters)
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async def test_cancel_race(self):
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# Several tasks:
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# - A acquires the lock
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# - B is blocked in acquire()
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# - C is blocked in acquire()
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#
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# Now, concurrently:
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# - B is cancelled
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# - A releases the lock
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#
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# If B's waiter is marked cancelled but not yet removed from
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# _waiters, A's release() call will crash when trying to set
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# B's waiter; instead, it should move on to C's waiter.
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# Setup: A has the lock, b and c are waiting.
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with self.assertWarns(DeprecationWarning):
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lock = asyncio.Lock(loop=asyncio.get_running_loop())
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async def lockit(name, blocker):
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await lock.acquire()
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try:
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if blocker is not None:
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await blocker
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finally:
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lock.release()
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fa = asyncio.get_running_loop().create_future()
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ta = asyncio.create_task(lockit('A', fa))
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await asyncio.sleep(0)
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self.assertTrue(lock.locked())
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tb = asyncio.create_task(lockit('B', None))
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await asyncio.sleep(0)
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self.assertEqual(len(lock._waiters), 1)
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tc = asyncio.create_task(lockit('C', None))
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await asyncio.sleep(0)
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self.assertEqual(len(lock._waiters), 2)
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# Create the race and check.
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# Without the fix this failed at the last assert.
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fa.set_result(None)
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tb.cancel()
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self.assertTrue(lock._waiters[0].cancelled())
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await asyncio.sleep(0)
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self.assertFalse(lock.locked())
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self.assertTrue(ta.done())
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self.assertTrue(tb.cancelled())
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await tc
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async def test_cancel_release_race(self):
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# Issue 32734
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# Acquire 4 locks, cancel second, release first
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# and 2 locks are taken at once.
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loop = asyncio.get_running_loop()
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with self.assertWarns(DeprecationWarning):
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lock = asyncio.Lock(loop=loop)
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lock_count = 0
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call_count = 0
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async def lockit():
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nonlocal lock_count
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nonlocal call_count
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call_count += 1
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await lock.acquire()
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lock_count += 1
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def trigger():
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t1.cancel()
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lock.release()
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await lock.acquire()
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t1 = asyncio.create_task(lockit())
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t2 = asyncio.create_task(lockit())
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t3 = asyncio.create_task(lockit())
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# Start scheduled tasks
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await asyncio.sleep(0)
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loop.call_soon(trigger)
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with self.assertRaises(asyncio.CancelledError):
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# Wait for cancellation
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await t1
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# Make sure only one lock was taken
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self.assertEqual(lock_count, 1)
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# While 3 calls were made to lockit()
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self.assertEqual(call_count, 3)
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self.assertTrue(t1.cancelled() and t2.done())
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# Cleanup the task that is stuck on acquire.
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t3.cancel()
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await asyncio.sleep(0)
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self.assertTrue(t3.cancelled())
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async def test_finished_waiter_cancelled(self):
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with self.assertWarns(DeprecationWarning):
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lock = asyncio.Lock(loop=asyncio.get_running_loop())
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await lock.acquire()
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self.assertTrue(lock.locked())
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tb = asyncio.create_task(lock.acquire())
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await asyncio.sleep(0)
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self.assertEqual(len(lock._waiters), 1)
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# Create a second waiter, wake up the first, and cancel it.
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# Without the fix, the second was not woken up.
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tc = asyncio.create_task(lock.acquire())
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tb.cancel()
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lock.release()
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await asyncio.sleep(0)
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self.assertTrue(lock.locked())
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self.assertTrue(tb.cancelled())
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# Cleanup
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await tc
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async def test_release_not_acquired(self):
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with self.assertWarns(DeprecationWarning):
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lock = asyncio.Lock(loop=asyncio.get_running_loop())
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self.assertRaises(RuntimeError, lock.release)
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async def test_release_no_waiters(self):
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with self.assertWarns(DeprecationWarning):
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lock = asyncio.Lock(loop=asyncio.get_running_loop())
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await lock.acquire()
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self.assertTrue(lock.locked())
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lock.release()
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self.assertFalse(lock.locked())
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async def test_context_manager(self):
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lock = asyncio.Lock()
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self.assertFalse(lock.locked())
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async with lock:
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self.assertTrue(lock.locked())
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self.assertFalse(lock.locked())
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class EventTests(unittest.IsolatedAsyncioTestCase):
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async def test_ctor_loop(self):
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loop = mock.Mock()
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with self.assertWarns(DeprecationWarning):
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ev = asyncio.Event(loop=loop)
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self.assertIs(ev._loop, loop)
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with self.assertWarns(DeprecationWarning):
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ev = asyncio.Event(loop=asyncio.get_running_loop())
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self.assertIs(ev._loop, asyncio.get_running_loop())
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async def test_ctor_noloop(self):
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asyncio.set_event_loop(asyncio.get_running_loop())
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ev = asyncio.Event()
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self.assertIs(ev._loop, asyncio.get_running_loop())
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async def test_repr(self):
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with self.assertWarns(DeprecationWarning):
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ev = asyncio.Event(loop=asyncio.get_running_loop())
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self.assertTrue(repr(ev).endswith('[unset]>'))
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match = RGX_REPR.match(repr(ev))
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self.assertEqual(match.group('extras'), 'unset')
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ev.set()
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self.assertTrue(repr(ev).endswith('[set]>'))
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self.assertTrue(RGX_REPR.match(repr(ev)))
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ev._waiters.append(mock.Mock())
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self.assertTrue('waiters:1' in repr(ev))
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self.assertTrue(RGX_REPR.match(repr(ev)))
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async def test_wait(self):
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with self.assertWarns(DeprecationWarning):
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ev = asyncio.Event(loop=asyncio.get_running_loop())
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self.assertFalse(ev.is_set())
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result = []
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async def c1(result):
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if await ev.wait():
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result.append(1)
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async def c2(result):
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if await ev.wait():
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result.append(2)
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async def c3(result):
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if await ev.wait():
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result.append(3)
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t1 = asyncio.create_task(c1(result))
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t2 = asyncio.create_task(c2(result))
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await asyncio.sleep(0)
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self.assertEqual([], result)
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t3 = asyncio.create_task(c3(result))
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ev.set()
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await asyncio.sleep(0)
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self.assertEqual([3, 1, 2], result)
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self.assertTrue(t1.done())
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self.assertIsNone(t1.result())
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self.assertTrue(t2.done())
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self.assertIsNone(t2.result())
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self.assertTrue(t3.done())
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self.assertIsNone(t3.result())
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async def test_wait_on_set(self):
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ev = asyncio.Event()
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ev.set()
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res = await ev.wait()
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self.assertTrue(res)
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async def test_wait_cancel(self):
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ev = asyncio.Event()
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wait = asyncio.create_task(ev.wait())
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asyncio.get_running_loop().call_soon(wait.cancel)
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with self.assertRaises(asyncio.CancelledError):
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await wait
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self.assertFalse(ev._waiters)
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async def test_clear(self):
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ev = asyncio.Event()
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self.assertFalse(ev.is_set())
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ev.set()
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self.assertTrue(ev.is_set())
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ev.clear()
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self.assertFalse(ev.is_set())
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async def test_clear_with_waiters(self):
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ev = asyncio.Event()
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result = []
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async def c1(result):
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if await ev.wait():
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result.append(1)
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return True
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t = asyncio.create_task(c1(result))
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await asyncio.sleep(0)
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self.assertEqual([], result)
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ev.set()
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ev.clear()
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self.assertFalse(ev.is_set())
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ev.set()
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ev.set()
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self.assertEqual(1, len(ev._waiters))
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await asyncio.sleep(0)
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self.assertEqual([1], result)
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self.assertEqual(0, len(ev._waiters))
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self.assertTrue(t.done())
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self.assertTrue(t.result())
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class ConditionTests(unittest.IsolatedAsyncioTestCase):
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async def test_ctor_loop(self):
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loop = mock.Mock()
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with self.assertWarns(DeprecationWarning):
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cond = asyncio.Condition(loop=loop)
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self.assertIs(cond._loop, loop)
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cond = asyncio.Condition(loop=asyncio.get_running_loop())
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self.assertIs(cond._loop, asyncio.get_running_loop())
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async def test_ctor_noloop(self):
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cond = asyncio.Condition()
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self.assertIs(cond._loop, asyncio.get_running_loop())
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async def test_wait(self):
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cond = asyncio.Condition()
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result = []
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async def c1(result):
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await cond.acquire()
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if await cond.wait():
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result.append(1)
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return True
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async def c2(result):
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await cond.acquire()
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if await cond.wait():
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result.append(2)
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return True
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async def c3(result):
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await cond.acquire()
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if await cond.wait():
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result.append(3)
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return True
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t1 = asyncio.create_task(c1(result))
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t2 = asyncio.create_task(c2(result))
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t3 = asyncio.create_task(c3(result))
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await asyncio.sleep(0)
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self.assertEqual([], result)
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self.assertFalse(cond.locked())
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self.assertTrue(await cond.acquire())
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cond.notify()
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await asyncio.sleep(0)
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self.assertEqual([], result)
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self.assertTrue(cond.locked())
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cond.release()
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await asyncio.sleep(0)
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self.assertEqual([1], result)
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self.assertTrue(cond.locked())
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cond.notify(2)
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await asyncio.sleep(0)
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self.assertEqual([1], result)
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self.assertTrue(cond.locked())
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cond.release()
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await asyncio.sleep(0)
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self.assertEqual([1, 2], result)
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self.assertTrue(cond.locked())
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cond.release()
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await asyncio.sleep(0)
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self.assertEqual([1, 2, 3], result)
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self.assertTrue(cond.locked())
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self.assertTrue(t1.done())
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self.assertTrue(t1.result())
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self.assertTrue(t2.done())
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self.assertTrue(t2.result())
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self.assertTrue(t3.done())
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self.assertTrue(t3.result())
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async def test_wait_cancel(self):
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cond = asyncio.Condition()
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await cond.acquire()
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wait = asyncio.create_task(cond.wait())
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asyncio.get_running_loop().call_soon(wait.cancel)
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with self.assertRaises(asyncio.CancelledError):
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await wait
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self.assertFalse(cond._waiters)
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self.assertTrue(cond.locked())
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async def test_wait_cancel_contested(self):
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cond = asyncio.Condition()
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await cond.acquire()
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self.assertTrue(cond.locked())
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wait_task = asyncio.create_task(cond.wait())
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await asyncio.sleep(0)
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self.assertFalse(cond.locked())
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# Notify, but contest the lock before cancelling
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await cond.acquire()
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self.assertTrue(cond.locked())
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cond.notify()
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asyncio.get_running_loop().call_soon(wait_task.cancel)
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asyncio.get_running_loop().call_soon(cond.release)
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try:
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await wait_task
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except asyncio.CancelledError:
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# Should not happen, since no cancellation points
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pass
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self.assertTrue(cond.locked())
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async def test_wait_cancel_after_notify(self):
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# See bpo-32841
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with self.assertWarns(DeprecationWarning):
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cond = asyncio.Condition(loop=asyncio.get_running_loop())
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waited = False
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async def wait_on_cond():
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nonlocal waited
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async with cond:
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waited = True # Make sure this area was reached
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await cond.wait()
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waiter = asyncio.create_task(wait_on_cond())
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await asyncio.sleep(0) # Start waiting
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await cond.acquire()
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cond.notify()
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await asyncio.sleep(0) # Get to acquire()
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waiter.cancel()
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await asyncio.sleep(0) # Activate cancellation
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cond.release()
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await asyncio.sleep(0) # Cancellation should occur
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self.assertTrue(waiter.cancelled())
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self.assertTrue(waited)
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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())
|
|
|
|
|
|
if __name__ == '__main__':
|
|
unittest.main()
|