gh-134009: Expose PyMutex_IsLocked in the public C API (gh-134365)

The `PyMutex_IsLocked()` function is useful in assertions for verifying that code maintains certain locking invariants.
2025-08-04 17:08:35 +00:00 · 2025-07-01 13:26:13 -04:00 · 2025-07-01 13:26:13 -04:00 · f41e9c750e
commit f41e9c750e
parent 86c3316183
6 changed files with 39 additions and 7 deletions
--- a/Include/internal/pycore_lock.h
+++ b/Include/internal/pycore_lock.h
@ -25,13 +25,6 @@ PyMutex_LockFast(PyMutex *m)
    return _Py_atomic_compare_exchange_uint8(lock_bits, &expected, _Py_LOCKED);
 }

-// Checks if the mutex is currently locked.
-static inline int
-PyMutex_IsLocked(PyMutex *m)
-{
-    return (_Py_atomic_load_uint8(&m->_bits) & _Py_LOCKED) != 0;
-}
-
 // Re-initializes the mutex after a fork to the unlocked state.
 static inline void
 _PyMutex_at_fork_reinit(PyMutex *m)