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                一個用到?`recover`?的程序(參見第 13.3 節)停掉了服務器內部一個失敗的協程而不影響其他協程的工作。 ~~~ func server(workChan <-chan *Work) { for work := range workChan { go safelyDo(work) // start the goroutine for that work } } func safelyDo(work *Work) { defer func { if err := recover(); err != nil { log.Printf("Work failed with %s in %v", err, work) } }() do(work) } ~~~ 上邊的代碼,如果?`do(work)`?發生 panic,錯誤會被記錄且協程會退出并釋放,而其他協程不受影響。 因為?`recover`?總是返回?`nil`,除非直接在?`defer`?修飾的函數中調用,`defer`?修飾的代碼可以調用那些自身可以使用?`panic`?和`recover`?避免失敗的庫例程(庫函數)。舉例,`safelyDo()`?中?`deffer`?修飾的函數可能在調用?`recover`?之前就調用了一個`logging`?函數,`panicking`?狀態不會影響?`logging`?代碼的運行。因為加入了恢復模式,函數?`do`(以及它調用的任何東西)可以通過調用?`panic`?來擺脫不好的情況。但是恢復是在?`panicking`?的協程內部的:不能被另外一個協程恢復。
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