I/O Multiplexing: select and poll

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Five I/O Models •blocking I/O: blocked all the way •nonblocking I/O: if no data in buffer, immediate returns EWOULDBLOCK •I/O multiplexing (select and poll): blocked separately in wait and copy •signal driven I/O (SIGIO): nonblocked in wait but blocked in copy (signaled when I/O can be initiated) •asynchronous I/O (aio_): nonblocked all the way (signaled when I/O is complete) 4
Comparison of Five I/O Models blocking nonblocking I/O multiplexing signal-driven asynchronous initiate check check establish initiate check SIGIO specify check handler signal/handler check check check ready notification initiate initiate blocked blocked blocked wait for data copy data blocked blocked complete complete complete complete notification synchronous I/O asynchronous I/O 5
Page 1 and 2: I/O Multiplexing: select and poll
Page 3: I/O 動作如何進行 •
Page 7 and 8: 對輸入裝置使用 select
Page 9 and 10: select Function #include #include
Page 11 and 12: Specifying Descriptor Values •We
Page 13 and 14: Low-Water Mark ( 低水位 ) •
Page 15 and 16: Ch. 5 兩個版本的比較 C
Page 17 and 18: Rewrite str_cli Function with selec
Page 19 and 20: 使用 select 函數常犯的
Page 21 and 22: Stop-and-Wait (Interactive) Mode
Page 23 and 24: Solution: UseShutdown Instead ofClo
Page 25 and 26: Rewrite str_cli with select and shu
Page 27 and 28: Concurrent TCP Echo Server with sel
Page 29 and 30: Initialization (cont.) tcpcliserv/t
Page 31 and 32: Loop (cont.) tcpcliserv/tcpservsele
Page 33 and 34: Denial of Service Attacks • 問
Page 35 and 36: poll Function: polling more specifi
Page 37 and 38: 設定 events 與測試 revents
Page 39 and 40: Concurrent TCP Echo Server with pol
Page 41 and 42: tcpcliserv/tcpservpoll01.c Initiali
Page 43 and 44: tcpcliserv/tcpservpoll01.c for (i =

I/O Multiplexing: select and poll

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