Golang : Call a function after some delay(time.Sleep and Tick)
Long time ago when I started learning Turbo Pascal by myself. One of the few functions that I'd learned is the delay()
function. Ah... those days..very nostalgic.
Anyway, these programs below will show you how to call a function after some delay. First example uses the time.Sleep()
function and the second example uses the time.Tick()
function.
Example 1:
package main
import (
"fmt"
"time"
)
func delaySecond(n time.Duration) {
time.Sleep(n * time.Second)
}
func delayMinute(n time.Duration) {
time.Sleep(n * time.Minute)
}
func main() {
fmt.Println("starts")
delaySecond(3) // delay 3 seconds
fmt.Println("after 3 second")
delayMinute(1) // delay 1 minute
fmt.Println("after 1 minute delay... now get back to work!")
}
Example 2 - For polling after 5 seconds
package main
import (
"fmt"
"time"
)
func echo(s string) {
fmt.Println(s)
}
func delaySecond(n time.Duration) {
for _ = range time.Tick(n * time.Second) {
str := "Hi! " + n.String() + " seconds have passed"
echo(str)
}
}
func main() {
go delaySecond(5) // very useful for interval polling
select {} // this will cause the program to run forever
}
The reason second example used the time.Tick()
function is because time.Sleep()
function will cause this error :
fatal error: all goroutines are asleep - deadlock!
Output : see http://play.golang.org/p/W3EYOHA-YS
Reference :
https://groups.google.com/forum/#!topic/golang-nuts/W1KJQr35NE0
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+8.1k Golang : Temperatures conversion example
+12.4k Golang : Check if an integer is negative or positive
+44.3k Golang : Marshal and unmarshal json.RawMessage struct example
+17.7k Golang : Delete duplicate items from a slice/array
+7.5k Golang : Another camera capture GUI application with GTK and OpenCV
+9.4k Golang : Select region of interest with mouse click and crop from image
+5.8k CloudFlare : Another way to get visitor's real IP address
+17.4k Unmarshal/Load CSV record into struct in Go
+13k Golang : How to determine if user agent is a mobile device example
+5.7k Default cipher that OpenSSL used to encrypt a PEM file
+16.1k Golang : Iterate linked list example
+3.5k Javascript : Detect when console is activated and do something about it