test_wait4.py 文件源码

def wait_impl(self, cpid):
        for i in range(10):
            # wait4() shouldn't hang, but some of the buildbots seem to hang
            # in the forking tests.  This is an attempt to fix the problem.
            spid, status, rusage = os.wait4(cpid, os.WNOHANG)
            if spid == cpid:
                break
            time.sleep(1.0)
        self.assertEqual(spid, cpid)
        self.assertEqual(status, 0, "cause = %d, exit = %d" % (status&0xff, status>>8))
        self.assertTrue(rusage)