Use time.After:
package main
import (
"log"
"math/rand"
"time"
)
func randomSleep(min, max int64) <-chan time.Time {
rand.Seed(time.Now().UnixNano())
sleepDuration := time.Duration(rand.Int63n(max-min)+min) *
time.Millisecond
log.Printf("Sleep duration: %v\n", sleepDuration)
return time.After(sleepDuration)
}
func main() {
select {
case <-time.After(1000 * time.Millisecond):
log.Println("time after chan triggered")
case <-randomSleep(1000, 2000):
log.Println("rand sleep triggered")
}
}
https://play.golang.org/p/nHOPEJ8URz
On Wednesday, December 28, 2016 at 2:46:03 PM UTC-5, Abhishek Singh wrote:
>
> 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.
>
--
You received this message because you are subscribed to the Google Groups
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to golang-nuts+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
