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gh-122201: Lock mutex when setting handling_thread to NULL (#122204)

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In the free-threaded build, we need to lock pending->mutex when clearing
the handling_thread in order not to race with a concurrent
make_pending_calls in the same interpreter.
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Sam Gross 2024-07-26 13:06:07 -04:00 • committed by GitHub
parent 64857d849f
commit c557ae97d6
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2 changed files with 15 additions and 4 deletions
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18
Python/ceval_gil.c
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@ -901,6 +901,18 @@ unsignal_pending_calls(PyThreadState *tstate, PyInterpreterState *interp)
#endif
}
static void
clear_pending_handling_thread(struct _pending_calls *pending)
{
#ifdef Py_GIL_DISABLED
PyMutex_Lock(&pending->mutex);
pending->handling_thread = NULL;
PyMutex_Unlock(&pending->mutex);
#else
pending->handling_thread = NULL;
#endif
}
static int
make_pending_calls(PyThreadState *tstate)
{
@ -933,7 +945,7 @@ make_pending_calls(PyThreadState *tstate)
int32_t npending;
if (_make_pending_calls(pending, &npending) != 0) {
pending->handling_thread = NULL;
clear_pending_handling_thread(pending);
/* There might not be more calls to make, but we play it safe. */
signal_pending_calls(tstate, interp);
return -1;
@ -945,7 +957,7 @@ make_pending_calls(PyThreadState *tstate)
if (_Py_IsMainThread() && _Py_IsMainInterpreter(interp)) {
if (_make_pending_calls(pending_main, &npending) != 0) {
pending->handling_thread = NULL;
clear_pending_handling_thread(pending);
/* There might not be more calls to make, but we play it safe. */
signal_pending_calls(tstate, interp);
return -1;
@ -956,7 +968,7 @@ make_pending_calls(PyThreadState *tstate)
}
}
pending->handling_thread = NULL;
clear_pending_handling_thread(pending);
return 0;
}