Golang : Close channel after ticker stopped example



Tags : golang close-channel new-ticker timer

This is an example on how to close channel after the time.NewTicker() function - ticker stopped. i.e close the channel when all goroutines are finished.

From the documentation http://golang.org/pkg/time/#Ticker.Stop :

Stop turns off a ticker. After Stop, no more ticks will be sent. Stop does not close the channel, to prevent a read from the channel succeeding incorrectly.

IF you are looking to close the channel, the example below maybe useful to you.

 package main

 import (
 "fmt"
 "time"
 )

 func keepTicking(f func()) chan bool {

 done := make(chan bool, 1)

 go func() {
 ticker := time.NewTicker(time.Duration(1) * time.Second)

 defer ticker.Stop()

 for {
 select {
 case <-ticker.C:
 f()
 case <-done:
 fmt.Println("done")
 return
 }
 }
 }()
 return done
 }

 func main() {
 // continue ticking until 10 seconds and set done = true

 done := keepTicking(func() {
 fmt.Println("tick,tock.....")
 })
 time.Sleep(time.Duration(10) * time.Second)

 // close the channel when all go routines are finished
 close(done)

 time.Sleep(time.Duration(10) * time.Second)
 }

Output :

tick,tock.....

tick,tock.....

tick,tock.....

tick,tock.....

tick,tock.....

tick,tock.....

tick,tock.....

tick,tock.....

tick,tock.....

done

References :

https://www.socketloop.com/references/golang-time-newticker-stop-functions-and-ticker-type-example

http://golang.org/pkg/time/#Ticker.Stop



Tags : golang close-channel new-ticker timer

By Adam Ng

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