lock.py 文件源码

def __init__(self, fd, keys, excl=True, lock=False, mod=1048573, _ctx_cleanup=None):
        self.fd = fd
        self.locked = False
        self.mode = fcntl.LOCK_EX if excl else fcntl.LOCK_SH
        self._ctx_cleanup = _ctx_cleanup

        # sort so locks are acquired in consistent order
        # guarantees no inter-process deadlocks
        locks = set(hash(key) % mod for key in keys)
        self.locks = tuple(sorted(locks))

        if lock:
            self.lock()