test_threading.py 文件源码

def test_clear_threads_states_after_fork(self):
        # Issue #17094: check that threads states are cleared after fork()

        # start a bunch of threads
        threads = []
        for i in range(16):
            t = threading.Thread(target=lambda : time.sleep(0.3))
            threads.append(t)
            t.start()

        pid = os.fork()
        if pid == 0:
            # check that threads states have been cleared
            if len(sys._current_frames()) == 1:
                os._exit(0)
            else:
                os._exit(1)
        else:
            _, status = os.waitpid(pid, 0)
            self.assertEqual(0, status)

        for t in threads:
            t.join()