Method test_racing_getbuf_and_releasebuf

Lib/test/test_memoryview.py:868–890

Repeatly access the memoryview for racing.

(self)

@support.requires_resource("cpu")
class RacingTest(unittest.TestCase):
    def test_racing_getbuf_and_releasebuf(self):
        """Repeatly access the memoryview for racing."""
        try:
            from multiprocessing.managers import SharedMemoryManager
        except ImportError:
            self.skipTest("Test requires multiprocessing")
        from threading import Thread, Event

        start = Event()
        with SharedMemoryManager() as smm:
            obj = smm.ShareableList(range(100))
            def test():
                # Issue gh-127085, the `ShareableList.count` is just a
                # convenient way to mess the `exports` counter of `memoryview`,
                # this issue has no direct relation with `ShareableList`.
                start.wait(support.SHORT_TIMEOUT)
                for i in range(10):
                    obj.count(1)
            threads = [Thread(target=test) for _ in range(10)]
            with threading_helper.start_threads(threads):
                start.set()

            del obj


if __name__ == "__main__":