I/O模型 與 select, iocp, epoll,kqueue

1，IO模型如下： blocking I/O nonblocking I/O I/O multiplexing (select and poll ) signal driven I/O (SIGIO ) asynchronous I/O (the POSIX aio_ functions)   blocking I/O   當用戶進程調用了recvfrom這個(system call)系統調用，k

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