test_gipc.py 文件源码

python
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项目:gipc 作者: jgehrcke 项目源码 文件源码
def test_orphaned_signal_watcher(self):
        # Install libev-based signal watcher.
        s = gevent.signal(signal.SIGTERM, signals_test_sigterm_handler)
        # Normal behavior: signal handlers become inherited by children.
        # Bogus behavior of libev-based signal watchers in child process:
        # They should not be active anymore when 'orphaned' (when their
        # corresponding event loop has been destroyed). What happens, however:
        # The old handler stays active and registering a new handler does not
        # 'overwrite' the old one -- both are active.
        # Since this test is about testing the behavior of 'orphaned' libev
        # signal watchers, the signal must be transmitted *after* event loop
        # recreation, so wait here for the child process to go through
        # the hub & event loop destruction (and recreation) process before
        # sending the signal. Waiting is realized with sync through pipe.
        # Without cleanup code in gipc, the inherited but orphaned libev signal
        # watcher would be active in the fresh event loop and trigger the
        # handler. This is a problem. With cleanup code, this handler must
        # never be called. Child exitcode 20 means that the inherited handler
        # has been called, -15 (-signal.SIGTERM) means that the child was
        # actually killed by SIGTERM within a certain short time interval.
        # Returncode 0 would mean that the child finished normally after that
        # short time interval.
        with pipe() as (r, w):
            p = start_process(signals_test_child_a, (w,))
            assert r.get() == p.pid
            os.kill(p.pid, signal.SIGTERM)
            p.join()
            if not WINDOWS:
                assert p.exitcode == -signal.SIGTERM
            else:
                assert p.exitcode == signal.SIGTERM
        s.cancel()
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