[New-bugs-announce] [issue34433] cancel all other pending child futures

[tzongw]

New submission from tzongw <tzongw at 163.com>:

In `tasks.gather`, when a child future throws an exception and `return_exceptions` is False, outer future will call `set_exception` while other child futures is still running. In this case, outer future call `_GatheringFuture.cancel' first to cancel all other pending child futures for efficiency.

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components: asyncio
messages: 323755
nosy: asvetlov, tzongw, yselivanov
priority: normal
severity: normal
status: open
title: cancel all other pending child futures
type: performance
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34433>
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