Hi,
Below is a sample example, where I'm trying to understand behaviour of
select statement. I was hoping the time.After() case clause to succeed but
observation is that either of those clauses are executed intermittently.
Would help if someone could share what's going on.
func randomSleep(min, max int64) time.Duration {
rand.Seed(time.Now().UnixNano())
sleepDuration := time.Duration(rand.Int63n(max-min)+min) * time.Millisecond
log.Printf("Sleep duration: %v\n", sleepDuration)
time.Sleep(sleepDuration)
return sleepDuration
}
func main() {
sendCh := make(chan time.Duration, 1)
select {
case <-time.After(1000 * time.Millisecond):
log.Println("time after chan triggered")
case sendCh <- randomSleep(1000, 2000):
log.Println("rand sleep triggered")
}
}
Go Playground - https://play.golang.org/p/6SosvxOUGL
----
I understand, I could workaround this behaviour via:
func main() {
sendCh := make(chan time.Duration, 1)
go func () { sendCh <- randomSleep(1000, 2000) }()
select {
case <-time.After(1000 * time.Millisecond):
log.Println("time after chan triggered")
case <-sendCh:
log.Println("rand sleep triggered")
}
}
Thanks.
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