chs := make(chan int64, 3)
wg := sync.WaitGroup{} var i int64 for i = 0; i < 3; i++ {
   wg.Add(1)
   chs <- i
}
t1 := time.Now().Unix() go func() { time.Sleep(time.Second * 4) fmt.Println(<-chs)
   wg.Done()
}() go func() { time.Sleep(time.Second * 1) fmt.Println(<-chs)
   wg.Done()
}() go func() { time.Sleep(time.Second * 2) fmt.Println(<-chs)
   wg.Done()
}()
wg.Wait()
t2 := time.Now().Unix() fmt.Println("总耗时", t2-t1)

[GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production.
 - using env:   export GIN_MODE=release
 - using code:  gin.SetMode(gin.ReleaseMode)

[GIN-debug] GET    /hello                    --> main.Hello (3 handlers)
[GIN-debug] [WARNING] You trusted all proxies, this is NOT safe. We recommend you to set a value.
Please check https://pkg.go.dev/github.com/gin-gonic/gin#readme-don-t-trust-all-proxies for details.
[GIN-debug] Listening and serving HTTP on :88
0
1
2
总耗时 4
[GIN] 2022/12/10 - 16:46:16 | 200 |  4.001959301s |   192.168.133.1 | GET      "/hello"
 

总耗时以时间最长的为准