Class _ReleasingContextManager

tornado/locks.py:258–279

Releases a Lock or Semaphore at the end of a "with" statement. with (yield semaphore.acquire()): pass # Now semaphore.release() has been called.

class _ReleasingContextManager:
    """Releases a Lock or Semaphore at the end of a "with" statement.

    with (yield semaphore.acquire()):
        pass

    # Now semaphore.release() has been called.
    """

    def __init__(self, obj: Any) -> None:
        self._obj = obj

    def __enter__(self) -> None:
        pass

    def __exit__(
        self,
        exc_type: "Optional[Type[BaseException]]",
        exc_val: Optional[BaseException],
        exc_tb: Optional[types.TracebackType],
    ) -> None:
        self._obj.release()


class Semaphore(_TimeoutGarbageCollector):