kopia lustrzana https://github.com/micropython/micropython
83 wiersze
2.0 KiB
Python
83 wiersze
2.0 KiB
Python
# Test cancelling a task
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try:
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import asyncio
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except ImportError:
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print("SKIP")
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raise SystemExit
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async def task(s, allow_cancel):
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try:
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print("task start")
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await asyncio.sleep(s)
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print("task done")
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except asyncio.CancelledError as er:
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print("task cancel")
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if allow_cancel:
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raise er
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async def task2(allow_cancel):
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print("task 2")
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try:
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await asyncio.create_task(task(0.05, allow_cancel))
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except asyncio.CancelledError as er:
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print("task 2 cancel")
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raise er
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print("task 2 done")
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async def main():
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# Cancel task immediately
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t = asyncio.create_task(task(2, True))
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print(t.cancel())
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# Cancel task after it has started
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t = asyncio.create_task(task(2, True))
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await asyncio.sleep(0.01)
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print(t.cancel())
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print("main sleep")
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await asyncio.sleep(0.01)
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# Cancel task multiple times after it has started
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t = asyncio.create_task(task(2, True))
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await asyncio.sleep(0.01)
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for _ in range(4):
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print(t.cancel())
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print("main sleep")
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await asyncio.sleep(0.01)
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# Await on a cancelled task
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print("main wait")
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try:
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await t
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except asyncio.CancelledError:
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print("main got CancelledError")
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# Cancel task after it has finished
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t = asyncio.create_task(task(0.01, False))
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await asyncio.sleep(0.05)
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print(t.cancel())
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# Nested: task2 waits on task, task2 is cancelled (should cancel task then task2)
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print("----")
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t = asyncio.create_task(task2(True))
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await asyncio.sleep(0.01)
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print("main cancel")
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t.cancel()
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print("main sleep")
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await asyncio.sleep(0.1)
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# Nested: task2 waits on task, task2 is cancelled but task doesn't allow it (task2 should continue)
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print("----")
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t = asyncio.create_task(task2(False))
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await asyncio.sleep(0.01)
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print("main cancel")
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t.cancel()
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print("main sleep")
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await asyncio.sleep(0.1)
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asyncio.run(main())
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