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                # Go 工作池 在這個例子中,我們來看一下如何使用gorouotine和channel來實現工作池。 ```go package main import "fmt" import "time" // 我們將在worker函數里面運行幾個并行實例,這個函數從jobs通道 // 里面接受任務,然后把運行結果發送到results通道。每個job我們 // 都休眠一會兒,來模擬一個耗時任務。 func worker(id int, jobs <-chan int, results chan<- int) { for j := range jobs { fmt.Println("worker", id, "processing job", j) time.Sleep(time.Second) results <- j * 2 } } func main() { // 為了使用我們的工作池,我們需要發送工作和接受工作的結果, // 這里我們定義兩個通道,一個jobs,一個results jobs := make(chan int, 100) results := make(chan int, 100) // 這里啟動3個worker協程,一開始的時候worker阻塞執行,因為 // jobs通道里面還沒有工作任務 for w := 1; w <= 3; w++ { go worker(w, jobs, results) } // 這里我們發送9個任務,然后關閉通道,告知任務發送完成 for j := 1; j <= 9; j++ { jobs <- j } close(jobs) // 然后我們從results里面獲得結果 for a := 1; a <= 9; a++ { <-results } ``` 運行結果 ``` worker 1 processing job 1 worker 2 processing job 2 worker 3 processing job 3 worker 1 processing job 4 worker 3 processing job 5 worker 2 processing job 6 worker 1 processing job 7 worker 3 processing job 8 worker 2 processing job 9 ```
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