gh-87744: fix waitpid race while calling send_signal in asyncio #121126
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Thanks @kumaraditya303 for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13. |
miss-islington
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…pythonGH-121126) asyncio earlier relied on subprocess module to send signals to the process, this has some drawbacks one being that subprocess module unnecessarily calls waitpid on child processes and hence it races with asyncio implementation which internally uses child watchers. To mitigate this, now asyncio sends signals directly to the process without going through the subprocess on non windows systems. On Windows it fallbacks to subprocess module handling but on windows there are no child watchers so this issue doesn't exists altogether. (cherry picked from commit bd473aa) Co-authored-by: Kumar Aditya <[email protected]>
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GH-121194 is a backport of this pull request to the 3.13 branch. |
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GH-121126) (#121194) gh-87744: fix waitpid race while calling send_signal in asyncio (GH-121126) asyncio earlier relied on subprocess module to send signals to the process, this has some drawbacks one being that subprocess module unnecessarily calls waitpid on child processes and hence it races with asyncio implementation which internally uses child watchers. To mitigate this, now asyncio sends signals directly to the process without going through the subprocess on non windows systems. On Windows it fallbacks to subprocess module handling but on windows there are no child watchers so this issue doesn't exists altogether. (cherry picked from commit bd473aa) Co-authored-by: Kumar Aditya <[email protected]>
Akasurde
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…python#121126) asyncio earlier relied on subprocess module to send signals to the process, this has some drawbacks one being that subprocess module unnecessarily calls waitpid on child processes and hence it races with asyncio implementation which internally uses child watchers. To mitigate this, now asyncio sends signals directly to the process without going through the subprocess on non windows systems. On Windows it fallbacks to subprocess module handling but on windows there are no child watchers so this issue doesn't exists altogether.
noahbkim
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Jul 11, 2024
…python#121126) asyncio earlier relied on subprocess module to send signals to the process, this has some drawbacks one being that subprocess module unnecessarily calls waitpid on child processes and hence it races with asyncio implementation which internally uses child watchers. To mitigate this, now asyncio sends signals directly to the process without going through the subprocess on non windows systems. On Windows it fallbacks to subprocess module handling but on windows there are no child watchers so this issue doesn't exists altogether.
estyxx
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Jul 17, 2024
…python#121126) asyncio earlier relied on subprocess module to send signals to the process, this has some drawbacks one being that subprocess module unnecessarily calls waitpid on child processes and hence it races with asyncio implementation which internally uses child watchers. To mitigate this, now asyncio sends signals directly to the process without going through the subprocess on non windows systems. On Windows it fallbacks to subprocess module handling but on windows there are no child watchers so this issue doesn't exists altogether.
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asyncioearlier relied onsubprocessmodule to send signals to the process, this has some drawbacks one being that subprocess module unnecessarily callswaitpidon child processes and hence it races with asyncio implementation which internally uses child watchers. To mitigate this, now asyncio sends signals directly to the process without going through the subprocess on non windows systems. On Windows it fallbacks tosubprocessmodule handling but on windows there are no child watchers so this issue doesn't exists altogether.