go 协程之WaitGroup超时控制

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package main   import (     "fmt"     "sync"     "time" )   // 调用示例 func main() {     var w = sync.WaitGroup{}     var ch = make(chan bool)     w.Add(2)     go func() {         time.Sleep(time.Second * 2)         fmt.Println("我2秒")         w.Done()     }()     go func() {         time.Sleep(time.Second * 6)         fmt.Println("我6秒")         w.Done()     }()     go func() {         w.Wait()         ch <- false     }()       select {     case <-time.After(time.Second * 7):         fmt.Println("我超时了")     case <-ch:         fmt.Println("我结束了")     } }