process_lock.py 文件源码

def _try_acquire(self, blocking, watch):
        try:
            self.trylock()
        except IOError as e:
            if e.errno in (errno.EACCES, errno.EAGAIN):
                if not blocking or watch.expired():
                    return False
                else:
                    raise _utils.RetryAgain()
            else:
                raise threading.ThreadError("Unable to acquire lock on"
                                            " `%(path)s` due to"
                                            " %(exception)s" %
                                            {
                                                'path': self.path,
                                                'exception': e,
                                            })
        else:
            return True