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MessageQueue没有消息时候会怎样？阻塞之后怎么唤醒呢？说说pipe/epoll机制？接着上文的逻辑，当消息不可用或者没有消息的时候就会阻塞在next方法，而阻塞的办法是通过pipe/epoll机制epoll机制是一种IO多路复用的机制，具体逻辑就是一个进程可以监视多个描述符，当某个描述符就...

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常用的状态码1XX - 临时消息。服务器收到请求，需要请求者继续操作。2XX - 请求成功。请求成功收到，理解并处理。3XX - 重定向。需要进一步的操作以完成请求。4XX - 客户端错误。请求包含语法错误或无法完成请求。5XX - 服务器错误。服务器在处理请求的过程中发生了错误。常见状态码：200...

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