[stdlib] Add locked method to threading.Condition (#15075)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Alex Waygood <[email protected]>

Author: 3 people

stdlib/@tests/stubtest_allowlists/py314.txt

@@ -40,6 +40,9 @@ concurrent.interpreters._queues.UNBOUND_REMOVE
 
 importlib.util.Loader.exec_module  # See Lib/importlib/_abc.py. Might be defined for backwards compatibility
 
+# Condition functions are exported in __init__
+threading.Condition.locked
+multiprocessing.dummy.Condition.locked
 
 # ====================================
 # Pre-existing errors from Python 3.13

stdlib/threading.pyi

@@ -144,6 +144,9 @@ class Condition:
     ) -> None: ...
     def acquire(self, blocking: bool = True, timeout: float = -1) -> bool: ...
     def release(self) -> None: ...
+    if sys.version_info >= (3, 14):
+        def locked(self) -> bool: ...
+
     def wait(self, timeout: float | None = None) -> bool: ...
     def wait_for(self, predicate: Callable[[], _T], timeout: float | None = None) -> _T: ...
     def notify(self, n: int = 1) -> None: ...