[3.11] gh-104372: Drop the GIL around the vfork() call. (#104782)#104958
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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 python#104372. (cherry picked from commit d086792)
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I want to let this bake in some 3.12beta releases for a while before applying it to a stable release. thus "draft". |
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3.12 is now at RC stage; should we merge to 3.11? |
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On Linux where the
subprocessmodule can use thevforksyscall for faster spawning, prevent the parent process from blocking other threads by dropping the GIL while it waits for the vfork'ed child processexecoutcome. This prevents spawning a binary from a slow filesystem from blocking the rest of the application.Fixes #104372.
(cherry picked from commit d086792)
vfork()until the child processexec()succeeds or fails. #104372📚 Documentation preview 📚: https://cpython-previews--104958.org.readthedocs.build/