Example_multipleReasonsForCancellation.go

package main

import (
	"fmt"
	"time"
)
func Example_multipleReasonsForCancellation() {
	ctx1, cancel1 := context.WithCancel(context.Background())
	ctx2, cancel2 := context.WithTimeout(ctx1, 100*time.Millisecond)
	ctx, cancel3 := context.WithDeadline(ctx2, time.Now().Add(70*time.Millisecond))
	defer cancel3()
	defer cancel2()
	defer cancel1()

	select {
	case <-ctx.Done():
		fmt.Println("ctx.Done()")
	default:
		fmt.Println("ctx is not done")
	}

	time.Sleep(80 * time.Millisecond)

	select {
	case <-ctx.Done():
		fmt.Println("ctx.Done()")
	default:
		fmt.Println("ctx is not done")
	}
	// Output:
	// ctx is not done
	// ctx.Done()
}