bpo-42969: Hang non-main threads that attempt to acquire the GIL during finalization by jbms · Pull Request #28525 · python/cpython

bpo-42969: Hang non-main threads that attempt to acquire the GIL during finalization by jbms · Pull Request #28525 · python/cpython

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		{
		dprintf(("PyThread_pause_thread called\n"));
		while (1) {
		pause();

		while (1) {
		GetMessage(&msg, NULL, 0, 0);
		TranslateMessage(&msg);
		DispatchMessage(&msg);
		}

		@@ -306,4 +306,44 @@ PyCOND_BROADCAST(PyCOND_T *cv)

		#endif /* _POSIX_THREADS, NT_THREADS */

		/* Convenience interfaces that terminate the program in case of an error. */
		#define MUTEX_INIT(mut) \

		@@ -1615,6 +1616,47 @@ PyGILState_Release(PyGILState_STATE oldstate)
		PyEval_SaveThread();
		}

		int
		PyThread_TryAcquireFinalizeBlock()

		{
		dprintf(("PyThread_pause_thread called\n"));
		while (1) {
		pause();

		while (1) {
		if (GetMessage(&msg, NULL, 0, 0) == -1) return;
		TranslateMessage(&msg);
		DispatchMessage(&msg);

		`PyGILState_ReleaseGilAndFinalizeBlock` with the same value returned by this
		function. Calling `PyGILState_ReleaseGilAndFinalizeBlock` with the error
		value `PyGILState_TRY_LOCK_FAILED` is safe and does nothing. */
		PyAPI_FUNC(PyGILState_TRY_STATE) PyGILState_TryAcquireFinalizeBlockAndGil();

jbms mentioned this pull request

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		{
		dprintf(("PyThread_pause_thread called\n"));
		while (1) {
		pause();

		@@ -1615,6 +1616,47 @@ PyGILState_Release(PyGILState_STATE oldstate)
		PyEval_SaveThread();
		}

		int
		PyThread_TryAcquireFinalizeBlock()

		while (1) {
		Sleep(INFINITE);
		}