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Change default child watcher to PidfdChildWatcher on supported Linux versions #98023
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on Oct 8, 2022 Thanks!
There's a little bit of possible cleanup -- the check whether
os.pidfd_open()exists and works (can_use_pidfd()) is duplicated in Lib/test/test_asyncio/test_subprocess.py (as_has_pidfd_support). Whilecan_use_pidfd()is not a documented or public API I think it's better to call it from the test code so there's only one copy to update if the check ever changes.- added 2 commits that reference this issue
on Oct 8, 2022 - added a commit that references this issue
on Oct 11, 2022
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PidfdChildWatcherbased on pidfd_open is the best child watcher implementation for Linux as it avoids race conditions and is most reliable of all of them. It requires Linux 5.3+ so this will be detected at runtime if it can be used and if so use this instead ofThreadedChildWatcher.asynciowill favor usingPidfdChildWatcheroverThreadedChildWatcherin 3.12+ on systems which supports it.