Update ProcessPoolExecutor for 3.14 (#13994)

stdlib/concurrent/futures/_base.pyi

@@ -54,9 +54,20 @@ class Future(Generic[_T]):
 
 class Executor:
     def submit(self, fn: Callable[_P, _T], /, *args: _P.args, **kwargs: _P.kwargs) -> Future[_T]: ...
-    def map(
-        self, fn: Callable[..., _T], *iterables: Iterable[Any], timeout: float | None = None, chunksize: int = 1
-    ) -> Iterator[_T]: ...
+    if sys.version_info >= (3, 14):
+        def map(
+            self,
+            fn: Callable[..., _T],
+            *iterables: Iterable[Any],
+            timeout: float | None = None,
+            chunksize: int = 1,
+            buffersize: int | None = None,
+        ) -> Iterator[_T]: ...
+    else:
+        def map(
+            self, fn: Callable[..., _T], *iterables: Iterable[Any], timeout: float | None = None, chunksize: int = 1
+        ) -> Iterator[_T]: ...
+
     def shutdown(self, wait: bool = True, *, cancel_futures: bool = False) -> None: ...
     def __enter__(self) -> Self: ...
     def __exit__(

stdlib/concurrent/futures/process.pyi

@@ -236,3 +236,7 @@ class ProcessPoolExecutor(Executor):
 
     def _start_executor_manager_thread(self) -> None: ...
     def _adjust_process_count(self) -> None: ...
+
+    if sys.version_info >= (3, 14):
+        def kill_workers(self) -> None: ...
+        def terminate_workers(self) -> None: ...