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[3.12] gh-104372: Drop the GIL around the vfork() call. (GH-104782)#104942

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Merged

gpshead merged 1 commit intopython:3.12frommiss-islington:backport-d086792-3.12

May 25, 2023

Merged

[3.12] gh-104372: Drop the GIL around the vfork() call. (GH-104782)#104942

gpshead merged 1 commit intopython:3.12frommiss-islington:backport-d086792-3.12

May 25, 2023

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miss-islington commentedMay 25, 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.

FixesGH-104372.
(cherry picked from commitd086792)

Co-authored-by: Gregory P. Smithgps@python.org

📚 Documentation preview 📚:https://cpython-previews--104942.org.readthedocs.build/

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

302217d

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.FixespythonGH-104372.(cherry picked from commitd086792)Co-authored-by: Gregory P. Smith <gps@python.org>