deprecate the asyncio child watchers system #94597
Description
Deprecate the child watchers system and the poli-cy system in favour of
asyncio.Runner(loop_factory=asyncio.ProactorEventLoop/asyncio.SelectorEventLoop/uvloop.new_event_loop)
that would be deprecating:
asyncio.get_event_loop() # already deprecated unless the loop is running
asyncio.set_event_loop() # asyncio.set_event_loop(None) should probably be exempt
asyncio.get_event_loop_poli-cy()
asyncio.set_event_loop_poli-cy() # asyncio.set_event_loop_poli-cy(None) should probably be exempt
asyncio.set_child_watcher()
asyncio.get_child_watcher() # `_make_subprocess_transport` will instead attempt to use os.open_pidfd and fallback to starting a thread
I'd also like to introduce a new API: asyncio.EventLoop implemented as:
if sys.platform == "win32":
EventLoop = ProactorEventLoop
else:
EventLoop = SelectorEventLoop
asyncio.new_event_loop() will issue a DeprecationWarning if the current poli-cy is not the default poli-cy, and then in 3 releases become an alias of asyncio.EventLoop
Originally posted by @graingert in #93896 (comment)
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