golang的context

context_with_timeout.go

package main

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

func main() {
	ctx := context.Background()
	ctx, cancel := context.WithTimeout(ctx, 3 * time.Second)
	defer cancel()

	go func() {
		for range time.Tick(time.Second) {
			select {
			case <-ctx.Done():
				return
			default:
				fmt.Println("monitor working")
			}
		}
	}()

	time.Sleep(time.Second * 10)

}