go timeout example using context

timeout.go

package main

import (
	"context"
	"fmt"
	"time"
)

func routine(ctx context.Context) {
	for {
		// work goes here

		// periodically check if context is cancelled.
		// If yes, ctx.Done channel is closed and it stops blocking,
		// thus getting selected
		select {
		case <-ctx.Done():
			fmt.Println(ctx.Err())
			return
		default:
		}
	}

}

func main() {
	ctx, _ := context.WithTimeout(context.Background(), 3*time.Second)
	go routine(ctx)
	time.Sleep(5 * time.Second)
	fmt.Println("end")
}