test_gipc.py 文件源码

def test_exitcode_previous_to_join(self):
        p = start_process(lambda: gevent.sleep(SHORTTIME))
        # Assume that the child process is still alive when the next
        # line is executed by the interpreter (there is no guarantee
        # for that, but it's rather likely).
        assert p.exitcode is None

        # Expect the child watcher mechanism to pick up
        # and process the child process termination event
        # (within at most two seconds). The `gevent.sleep()`
        # invocations allow for libev event loop iterations,
        # two of which are required after the OS delivers the
        # SIGCHLD signal to the parent process: one iteration
        # invokes the child reap loop, and the next invokes
        # the libev callback associated with the termination
        # event.
        deadline = time.time() + 2
        while time.time() < deadline:
            if p.exitcode is not None:
                assert p.exitcode == 0
                p.join()
                return
            gevent.sleep(ALMOSTZERO)
        raise Exception('Child termination not detected')