2025-08-02 11:00:42 +0000 UTC

class Foo:
    def __init__(self):
        self._lock1 = threading.Lock()
        self._lock2 = threading.Lock()
        self._lock1.acquire()
        self._lock2.acquire()

    def first(self, printFirst: 'Callable[[], None]') -> None:
        printFirst()
        self._lock1.release()


    def second(self, printSecond: 'Callable[[], None]') -> None:
        with self._lock1:
            printSecond()
        self._lock2.release()


    def third(self, printThird: 'Callable[[], None]') -> None:
        with self._lock2:
            printThird()