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                ### sync.WaitGroup 可以看到在分配一個邏輯處理器的情況下,兩個goroutine的任務交替進行,實現了并發的效果. ~~~ var wg sync.WaitGroup func main() { runtime.GOMAXPROCS(1) //設置1個邏輯處理器 //runtime.GOMAXPROCS(runtime.NumCPU()) //可以獲取物理核心的數量,并修改runtime. 可以使goroutine進行并行處理 wg.Add(2) //添加兩個任務 go printPrime("A") //啟動任務A go printPrime("B") //啟動任務B fmt.Println("等待") wg.Wait() //阻塞等待任務完成 fmt.Printf("完成") } func printPrime(prefix string) { defer wg.Done() //任務完成將任務數量-1 , 和Add(-1) 的效果是一樣的 next: for outer := 2; outer < 10000; outer++ { for inner := 2; inner < outer; inner++ { if outer%inner == 0 { continue next } } fmt.Printf("%s;%d\n", prefix, outer) } fmt.Println("完成", prefix) } ~~~
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