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[3.13] gh-134381: Fix RuntimeError when starting not-yet started Thread after fork (gh-134514) (gh-134597)

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(cherry picked from commit 9a2346df86)

Co-authored-by: Jiucheng(Oliver) <git.jiucheng@gmail.com>
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Miss Islington (bot) 2025-05-23 21:45:51 +02:00 • committed by GitHub
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commit e4c4ecccec
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6
Modules/_threadmodule.c
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@ -262,6 +262,12 @@ _PyThread_AfterFork(struct _pythread_runtime_state *state)
continue;
}
// Keep handles for threads that have not been started yet. They are
// safe to start in the child process.
if (handle->state == THREAD_HANDLE_NOT_STARTED) {
continue;
}
// Mark all threads as done. Any attempts to join or detach the
// underlying OS thread (if any) could crash. We are the only thread;
// it's safe to set this non-atomically.