WithDeadline in Go

Posted by GoDoc
Public (Editable by Users)

This example passes a context with an arbitrary deadline to tell a blocking function that it should abandon its work as soon as it gets to it.

Go
Edit 
package main

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

func main() {
	d := time.Now().Add(50 * time.Millisecond)
	ctx, cancel := context.WithDeadline(context.Background(), d)

	// Even though ctx will be expired, it is good practice to call its
	// cancellation function in any case. Failure to do so may keep the
	// context and its parent alive longer than necessary.
	defer cancel()

	select {
	case <-time.After(1 * time.Second):
		fmt.Println("overslept")
	case <-ctx.Done():
		fmt.Println(ctx.Err())
	}
}