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1 snippets
  • Example of using Go timers

    package main
    import (
    func main() {
    	firstTimer := time.NewTimer(3 * time.Second)
    	value := <-firstTimer.C // value is a current time
    	fmt.Printf("first timer expired: %v\n", value) // the line printed 3 seconds after running code
    	secondTimer := time.NewTimer(2 * time.Second)
    	go func() {
    		fmt.Println("second timer expired") // the line is not printed because the second timer is stopped before expiration
    	stop := secondTimer.Stop() // stop second timer before it expired
    	if stop {
    		fmt.Println("second timer is stopped")
    // $ go run timers.go
    // first timer expired: 2024-02-09 22:32:57.570649221 +0700 +07 m=+3.002054417
    // second timer is stopped

    Timers allow you to execute one event in the future. You tell the timer how long you want to wait and it provides a channel to be notified at that time. The first timer will wait for 3 seconds. <-firstTimer.C blocks the timer C channel until a message (current time) is sent indicating that the timer has expired. If you just want to wait, you can use time.Sleep. One reason a timer can be useful is that you can cancel the timer before it expires. The first timer expires 3s after the program starts, but the second is stopped before it expires.