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                            ### 異步I/O
應用進程執行 aio\_read 系統調用會立即返回，應用進程可以繼續執行，不會被阻塞，內核會在所有操作完成之后向應用進程發送信號。
異步 I/O 與信號驅動 I/O 的區別在于，異步 I/O 的信號是通知應用進程 I/O 完成，而信號驅動 I/O 的信號是通知應用進程可以開始 I/O
![](https://img.kancloud.cn/54/13/5413fa6fe146573ed9747ae3e1b6b6f3_718x407.png)

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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