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gh-113964: Don't prevent new threads until all non-daemon threads exit (#116677)

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Starting in Python 3.12, we prevented calling fork() and starting new threads
during interpreter finalization (shutdown). This has led to a number of
regressions and flaky tests. We should not prevent starting new threads
(or `fork()`) until all non-daemon threads exit and finalization starts in
earnest.

This changes the checks to use `_PyInterpreterState_GetFinalizing(interp)`,
which is set immediately before terminating non-daemon threads.
This commit is contained in:
Sam Gross 2024-03-19 14:40:20 -04:00 • committed by GitHub
parent 025ef7a5f7
commit 60e105c1c1
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8 changed files with 57 additions and 27 deletions
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Modules/_threadmodule.c
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@ -1729,7 +1729,7 @@ do_start_new_thread(thread_module_state *state, PyObject *func, PyObject *args,
"thread is not supported for isolated subinterpreters");
return -1;
}
if (interp->finalizing) {
if (_PyInterpreterState_GetFinalizing(interp) != NULL) {
PyErr_SetString(PyExc_PythonFinalizationError,
"can't create new thread at interpreter shutdown");
return -1;