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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

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@miss-islingtonmiss-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/

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>
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