选择器在内部调用一个本机poll()函数（见清单5），这个函数支持在一组文件描述符上多路复用输入和输出

The selector internally calls a native poll() function (shown in Listing 5), which provides a mechanism for multiplexing inputs and outputs over a set of file descriptors

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选择器在内部调用一个本机poll()函数（见清单5），这个函数支持在一组文件描述符上多路复用输入和输出

The selector internally calls a native poll() function (shown in Listing 5), which provides a mechanism for multiplexing inputs and outputs over a set of file descriptors

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