Golang：等待x时间再重新循环而不启动新的goroutine

Question

I have a loop that needs to wait a random amount of time before looping again.

What I have:

for {
    rand.Seed(time.Now().UnixNano())
    r := rand.Int()
    //Do stuff
    t, _ := time.ParseDuration(string(r) + "ms")
    time.Sleep(t)
}

Unfortunately, the loops run multiple times, just like if time.Sleep was not working.

Answer 1

for loop doesn't spawn new goroutines unless you do it explicitly in cycle. By default next cycle starts only after previous is done. So you do not need any delay. Just make sure you do not use go keyword in your cycle.

If you want to launch goroutines:

for {
    rand.Seed(time.Now().UnixNano())
    r := rand.Int()
    //Do stuff in separate goroutine
    go DoStuff()
    t, _ := time.ParseDuration(string(r) + "ms")
    time.Sleep(t)
}

This way new goroutine will be launched.