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gh-114271: Make PyInterpreterState.threads.count thread-safe in free-threaded builds #115093

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Feb 12, 2024
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gh-114271: Make PyInterpreterState.threads.count thread-safe in free-threaded builds #115093

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2 changes: 1 addition & 1 deletion Include/internal/pycore_interp.h
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Original file line number Diff line number Diff line change
Expand Up @@ -112,7 +112,7 @@ struct _is {
/* The thread currently executing in the __main__ module, if any. */
PyThreadState *main;
/* Used in Modules/_threadmodule.c. */
long count;
Py_ssize_t count;
/* Support for runtime thread stack size tuning.
A value of 0 means using the platform's default stack size
or the size specified by the THREAD_STACK_SIZE macro. */
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6 changes: 3 additions & 3 deletions Modules/_threadmodule.c
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Expand Up @@ -1225,7 +1225,7 @@ thread_run(void *boot_raw)

_PyThreadState_Bind(tstate);
PyEval_AcquireThread(tstate);
tstate->interp->threads.count++;
_Py_atomic_add_ssize(&tstate->interp->threads.count, 1);

PyObject *res = PyObject_Call(boot->func, boot->args, boot->kwargs);
if (res == NULL) {
Expand All @@ -1243,7 +1243,7 @@ thread_run(void *boot_raw)

thread_bootstate_free(boot, 1);

tstate->interp->threads.count--;
_Py_atomic_add_ssize(&tstate->interp->threads.count, -1);
PyThreadState_Clear(tstate);
_PyThreadState_DeleteCurrent(tstate);

Expand Down Expand Up @@ -1520,7 +1520,7 @@ static PyObject *
thread__count(PyObject *self, PyObject *Py_UNUSED(ignored))
{
PyInterpreterState *interp = _PyInterpreterState_GET();
return PyLong_FromLong(interp->threads.count);
return PyLong_FromSsize_t(_Py_atomic_load_ssize(&interp->threads.count));
}

PyDoc_STRVAR(_count_doc,
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