daemon.py 文件源码

def join(pid, timeout):
    if pid == 0:
        return
    start = time.time()
    while time.time() - start < timeout:
        try:
            proc = Process(pid)
        except NoSuchProcess:
            return
        except IOError, e:
            if e.errno == errno.ESRCH:
                return
            else:
                raise e
        time.sleep(0.5)
    raise Timeout('timeout')