We often want to execute Go code at some point in the future, or repeatedly at some interval. Go's built-in timer and ticker features make both od these easy. We'll look first at timers then tickers
package main import ( "fmt" "time" ) func main() { timer1 := time.NewTimer(time.Second * 2) <-timer1.C fmt.Println("Time 1 expired") timer2 := time.NewTimer(time.Second) go func() { <-timer2.C fmt.Println("Timer 2 expired") }() stop2 := timer2.Stop() if stop2 { fmt.Println("Timer 2 stopped") } }
Time 1 expired Timer 2 stopped
总结 :
1 : <-timer1.C 将导致 block
2 : If you just wanted to wait, you could have used time.Sleep; You can cancel the timer before it expires
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