How can you forcibly terminate all running goroutines in a program?

Go does not have a built-in way to forcibly terminate all goroutines, as they lack an external force stop mechanism. To manage the lifecycle of goroutines, contexts (context.Context) or channels are typically used for signaling completion.

General approach:

1. Create a context.WithCancel or a channel.
2. Pass it to goroutines.
3. When needed, call cancel() or close the channel to signal goroutines to finish.

Example:

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

go func(ctx context.Context) {
    for {
        select {
        case <-ctx.Done():
            return // End the goroutine
        default:
            // Goroutine work
        }
    }
}(ctx)

// When you need to stop all goroutines
cancel()

Thus, the termination of goroutines is controlled by the goroutine code itself, not externally.