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阻塞 IO通常在进行同步 I/O 操作时，如果读取数据，代码会阻塞直至有可供读取的数据。同样，写入调用将会阻塞直至数据能够写入。传统的 Server/Client 模式会基于 TPR （Thread per Request ）, 服务器会为每个客户端请求建立一个线程，由该线程单独负责处理一个客户请求...

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