test_util.py 文件源码

def test_blocking_lock_file(self):
        my_file = tempfile.mktemp()
        lock_file = BlockingLockFile(my_file)
        lock_file._obtain_lock()

        # next one waits for the lock
        start = time.time()
        wait_time = 0.1
        wait_lock = BlockingLockFile(my_file, 0.05, wait_time)
        self.failUnlessRaises(IOError, wait_lock._obtain_lock)
        elapsed = time.time() - start
        extra_time = 0.02
        if is_win:
            # for Appveyor
            extra_time *= 6  # NOTE: Indeterministic failures here...
        self.assertLess(elapsed, wait_time + extra_time)