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彻底理解为什么网络 I/O 会被阻塞?
2022-07-05 18:34:00 【InfoQ】
I/O到底是什么?
创建 socket
- domain:这个参数用于选择通信的协议族,比如选择 IPv4 通信,还是 IPv6 通信等等
- type:选择套接字类型,可选字节流套接字、数据报套接字等等。
- protocol:指定使用的协议。
bind
listen
- socket 有一个队列,同时存放已完成的连接和半连接,backlog为这个队列的大小。
- socket 有两个队列,分别为已完成的连接队列和半连接队列,backlog为这个两个队列的大小之和。
- socket 有两个队列,分别为已完成的连接队列和半连接队列,backlog仅为已完成的连接队列大小。
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accept
connect
- connect:需要阻塞等待三次握手的完成。
- accept:需要等待可用的已完成的连接,如果已完成连接队列为空,则被阻塞。
read、write
最后
参考资料
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