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                ## 2.2 解決阻塞死等待的辦法 ### 2.2.1 阻塞死等待的缺點 ![](https://img.kancloud.cn/0e/e6/0ee6d2dc2ccd0372316093371b46f324_651x407.png) ### 2.2.2 辦法一:非阻塞、忙輪詢 ![](https://img.kancloud.cn/32/1f/321f3bc980fe11597174562bcb0f6605_629x417.png) ```cpp while true { for i in 流[] { if i has 數據 { 讀 或者 其他處理 } } } ``` ### 2.2.3 辦法二:select ![](https://img.kancloud.cn/ee/43/ee430296183245bb677144388a458f5e_675x410.png) select 代收員 比較懶,她只會告訴你快遞到了,但是是誰到的,你需要挨個快遞員問一遍。 ```cpp while true { select(流[]); //阻塞 for i in 流[] { if i has 數據 { 讀 或者 其他處理 } } } ``` ### 2.2.3 辦法三:epoll ![](https://img.kancloud.cn/f5/44/f544de1b2d23e9d5e101970d2fd0e2aa_710x371.png) ```cpp while true { 可處理的流[] = epoll_wait(epoll_fd); //阻塞 for i in 可處理的流[] { 讀 或者 其他處理 } } ```
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