[3.12] gh-104372: Drop the GIL around the vfork() call. (GH-104782) #104942
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On Linux where the `subprocess` module can use the `vfork` syscall for faster spawning, prevent the parent process from blocking other threads by dropping the GIL while it waits for the vfork'ed child process `exec` outcome. This prevents spawning a binary from a slow filesystem from blocking the rest of the application. Fixes pythonGH-104372. (cherry picked from commit d086792) Co-authored-by: Gregory P. Smith <gps@python.org>
This was referenced May 25, 2023
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On Linux where the
subprocessmodule can use thevforksyscall forfaster spawning, prevent the parent process from blocking other threads
by dropping the GIL while it waits for the vfork'ed child process
execoutcome. This prevents spawning a binary from a slow filesystem from
blocking the rest of the application.
Fixes GH-104372.
(cherry picked from commit d086792)
Co-authored-by: Gregory P. Smith gps@python.org
📚 Documentation preview 📚: https://cpython-previews--104942.org.readthedocs.build/