点击运行
package main import ( "fmt" "sync" ) var x = 0 func increment(wg *sync.WaitGroup, ch chan bool) { ch <- true x = x + 1 <- ch wg.Done() } func main() { var w sync.WaitGroup ch := make(chan bool, 1) for i := 0; i < 1000; i++ { w.Add(1) go increment(&w, ch) } w.Wait() fmt.Println("最后 x 的值为：", x) }
运行结果 :
正在执行...
