test_wait3.py 文件源码

def wait_impl(self, cpid):
        # This many iterations can be required, since some previously run
        # tests (e.g. test_ctypes) could have spawned a lot of children
        # very quickly.
        for i in range(30):
            # wait3() 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.wait3(os.WNOHANG)
            if spid == cpid:
                break
            time.sleep(0.1)

        self.assertEqual(spid, cpid)
        self.assertEqual(status, 0, "cause = %d, exit = %d" % (status&0xff, status>>8))
        self.assertTrue(rusage)