gevent 中写的很巧妙的地方分享 - V2EX
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boyhailong
V2EX    Python

gevent 中写的很巧妙的地方分享

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  •   boyhailong 2016-04-07 22:38:27 +08:00 2738 次点击
    这是一个创建于 3523 天前的主题,其中的信息可能已经有所发展或是发生改变。

    看到源代码里在 recv 里有个 while 循环

    def recv(self, *args): sock = self._sock # keeping the reference so that fd is not closed during waiting while True: try: return sock.recv(*args) except error as ex: if ex.args[0] != EWOULDBLOCK or self.timeout == 0.0: raise # QQQ without clearing exc_info test__refcount.test_clean_exit fails sys.exc_clear() self._wait(self._read_event) 

    当前可读的话,直接返回数据;
    如果不可读,调用_wait 将 sock 可读事件放进 loop 里等待 loop 检测可读事件,有可读事件时切换到当前协程,函数就开始执行
    return sock.recv(*args)
    理论上 while 循环最多被执行 2 次
    刚开始看没怎么懂,协程的编程还是流弊,之前 C++用习惯了线程回调,还一时转换不过来。

    1 条回复    2016-04-10 11:43:17 +08:00
    AZLisme
        1
    AZLisme  
       2016-04-10 11:43:17 +08:00
    哈哈,还可以还可以。
    我觉得就是充分利用了协程特性,是协程巧妙
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