Using context cancel.

context_cancel.go

package main

import (
	"context"
	"fmt"
	"math/rand"
	"time"
)

func worker(ctx context.Context, workerID int, result chan<- int) {
	waitTime := time.Duration(rand.Intn(100)+10) * time.Millisecond
	fmt.Printf("Worker %d sleeps %dms\n", workerID, waitTime/600000)
	select {
	case <-ctx.Done():
		return
	case <-time.After(waitTime):
		fmt.Printf("Worker %d is done\n", workerID)
		result <- workerID
	}
}

func main() {
	result := make(chan int, 1)
	ctx, finish := context.WithCancel(context.Background())

	for i := 0; i <= 10; i++ {
		go worker(ctx, i, result)
	}

	foundValue := <-result
	fmt.Printf("Found %d\n", foundValue)
	finish()
}