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gh-115103: Fix unregistering of QSBR state #116480

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Merged
merged 1 commit into from
Mar 8, 2024
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gh-115103: Fix unregistering of QSBR state #116480

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10 changes: 7 additions & 3 deletions Python/qsbr.c
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Original file line number Diff line number Diff line change
Expand Up @@ -233,13 +233,17 @@ _Py_qsbr_register(_PyThreadStateImpl *tstate, PyInterpreterState *interp,
void
_Py_qsbr_unregister(_PyThreadStateImpl *tstate)
{
struct _qsbr_shared *shared = tstate->qsbr->shared;

PyMutex_Lock(&shared->mutex);
// NOTE: we must load (or reload) the thread state's qbsr inside the mutex
// because the array may have been resized (changing tstate->qsbr) while
// we waited to acquire the mutex.
struct _qsbr_thread_state *qsbr = tstate->qsbr;
struct _qsbr_shared *shared = qsbr->shared;

assert(qsbr->seq == 0 && "thread state must be detached");

PyMutex_Lock(&shared->mutex);
assert(qsbr->allocated && qsbr->tstate == (PyThreadState *)tstate);

tstate->qsbr = NULL;
qsbr->tstate = NULL;
qsbr->allocated = false;
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