43 lines
1.1 KiB
Python
43 lines
1.1 KiB
Python
# In MicroPython, a non-awaited task with a pending exception will raise to
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# the loop's exception handler the second time it is scheduled. This is
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# because without reference counting we have no way to know when the task is
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# truly "non awaited" -- i.e. we only know that it wasn't awaited in the time
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# it took to be re-scheduled.
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# If the task _is_ subsequently awaited, then the await should succeed without
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# raising.
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try:
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import uasyncio as asyncio
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except ImportError:
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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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def custom_handler(loop, context):
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print("exception handler", type(context["exception"]).__name__)
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async def main():
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loop = asyncio.get_event_loop()
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loop.set_exception_handler(custom_handler)
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async def task():
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print("raise")
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raise OSError
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print("create")
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t = asyncio.create_task(task())
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print("sleep 1")
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await asyncio.sleep(0)
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print("sleep 2")
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await asyncio.sleep(0)
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print("await")
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await t # should not raise.
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asyncio.run(main())
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