51 lines
1.5 KiB
Python
51 lines
1.5 KiB
Python
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# MicroPython uasyncio module
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# MIT license; Copyright (c) 2019-2020 Damien P. George
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from . import core
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async def wait_for(aw, timeout):
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aw = core._promote_to_task(aw)
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if timeout is None:
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return await aw
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def cancel(aw, timeout):
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await core.sleep(timeout)
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aw.cancel()
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cancel_task = core.create_task(cancel(aw, timeout))
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try:
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ret = await aw
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except core.CancelledError:
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# Ignore CancelledError from aw, it's probably due to timeout
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pass
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finally:
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# Cancel the "cancel" task if it's still active (optimisation instead of cancel_task.cancel())
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if cancel_task.coro is not None:
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core._task_queue.remove(cancel_task)
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if cancel_task.coro is None:
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# Cancel task ran to completion, ie there was a timeout
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raise core.TimeoutError
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return ret
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async def gather(*aws, return_exceptions=False):
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ts = [core._promote_to_task(aw) for aw in aws]
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for i in range(len(ts)):
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try:
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# TODO handle cancel of gather itself
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# if ts[i].coro:
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# iter(ts[i]).waiting.push_head(cur_task)
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# try:
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# yield
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# except CancelledError as er:
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# # cancel all waiting tasks
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# raise er
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ts[i] = await ts[i]
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except Exception as er:
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if return_exceptions:
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ts[i] = er
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else:
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raise er
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return ts
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