How can you forcibly stop multiple goroutines that are running at once in Go?

In Go, to forcibly stop multiple goroutines, the common mechanism is cancellation via context.Context.

Main idea:

• Create a context with cancellation (context.WithCancel or context.WithTimeout).
• Each goroutine accepts this context and periodically checks if it has been canceled.
• When the cancel function (cancel()) is called, all goroutines receive the signal and can terminate gracefully.

Example:

ctx, cancel := context.WithCancel(context.Background())

for i := 0; i < 5; i++ {
    go func(id int) {
        for {
            select {
            case <-ctx.Done():
                fmt.Printf("Goroutine %d stopped\n", id)
                return
            default:
                // goroutine work
                time.Sleep(100 * time.Millisecond)
            }
        }
    }(i)
}

// After some time, stop all goroutines
time.Sleep(1 * time.Second)
cancel()

// Wait for completion (e.g., via sync.WaitGroup)

This approach allows centralized control over stopping multiple goroutines and avoids issues with uncontrolled termination.