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[3.13] gh-126688: Reinit import lock after fork (GH-126692) (GH-126765)

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The PyMutex implementation supports unlocking after fork because we
clear the list of waiters in parking_lot.c. This doesn't work as well
for _PyRecursiveMutex because on some systems, such as SerenityOS, the
thread id is not preserved across fork().
(cherry picked from commit 5610860840)

Co-authored-by: Sam Gross <colesbury@gmail.com>
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Miss Islington (bot) 2024-11-12 23:00:42 +01:00 • committed by GitHub
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commit 13fe8f946e
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Include/internal/pycore_import.h
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@ -21,6 +21,7 @@ extern int _PyImport_SetModuleString(const char *name, PyObject* module);
extern void _PyImport_AcquireLock(PyInterpreterState *interp);
extern void _PyImport_ReleaseLock(PyInterpreterState *interp);
extern void _PyImport_ReInitLock(PyInterpreterState *interp);
// This is used exclusively for the sys and builtins modules:
extern int _PyImport_FixupBuiltin(