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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                select 結構組成主要是由 case 語句和執行的函數組成 是一種io多路復用機制, case結構 ~~~ type scase struct { c *hchan // chan 管道 elem unsafe.Pointer // data element 元素指針 } ~~~ ### **該函數執行邏輯大致如下:** 1. 鎖定scase語句中所有的channel 2. 按照隨機順序檢測scase中的channel是否ready   2.1 如果case可讀,則讀取channel中數據,解鎖所有的channel,然后返回(case index)  2.2 如果case可寫,則將數據寫入channel,解鎖所有的channel,然后返回(case index) 2.3 所有case都未ready,則解鎖所有的channel,然后返回(default index) 3. 所有case都未ready,且沒有default語句  3.1 將當前協程加入到所有channel的等待隊列   3.2 當將協程轉入阻塞,等待被喚醒 4. 喚醒后返回channel對應的case index 4.1 如果是讀操作,解鎖所有的channel,然后返回(case index)  4.2 如果是寫操作,解鎖所有的channel,然后返回(case index)
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