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[3.11] gh-104372: Drop the GIL around the vfork() call. (#104782)#104958

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Merged

gpshead merged 2 commits intopython:3.11fromgpshead:backport-d086792-3.11

Sep 1, 2023

Merged

[3.11] gh-104372: Drop the GIL around the vfork() call. (#104782)#104958

gpshead merged 2 commits intopython:3.11fromgpshead:backport-d086792-3.11

Sep 1, 2023

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gpshead commentedMay 26, 2023•
edited by github-actionsbot
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On Linux where thesubprocess module can use thevfork syscall for faster spawning, prevent the parent process from blocking other threads by dropping the GIL while it waits for the vfork'ed child processexec outcome. This prevents spawning a binary from a slow filesystem from blocking the rest of the application.

Fixes#104372.

(cherry picked from commitd086792)

Issue:subprocess can block all Python threads when usingvfork() until the child processexec() succeeds or fails. #104372

📚 Documentation preview 📚:https://cpython-previews--104958.org.readthedocs.build/

pythongh-104372: Drop the GIL around the vfork() call. (python#104782)

75f7969

On Linux where the `subprocess` module can use the `vfork` syscall forfaster spawning, prevent the parent process from blocking other threadsby dropping the GIL while it waits for the vfork'ed child process `exec`outcome.  This prevents spawning a binary from a slow filesystem fromblocking the rest of the application.Fixespython#104372.(cherry picked from commitd086792)