转io的同步

转http://blogread.cn/it/article.php?id=4108&f=sinat

阻塞型 IO(blocking I/O)
非阻塞性IO(nonblocking I/O)
IO多路复用(I/O multiplexing)
信号驱动IO(signal driven I/O)
异步IO(asynchronous I/O)

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转载自haoningabc.iteye.com/blog/1143967