How can you guaranteedly complete the execution of all running goroutines in a program?

In Go, there is no built-in way to forcibly terminate a goroutine from outside. To reliably wait for all launched goroutines to finish, synchronization is usually done using sync.WaitGroup.

How it works:

• Before starting each goroutine, call wg.Add(1).
• Inside the goroutine, call wg.Done() at the end.
• In the main function, call wg.Wait(), which blocks execution until the counter reaches zero.

Example:

var wg sync.WaitGroup

wg.Add(1)
go func() {
    defer wg.Done()
    // goroutine work
}()

wg.Wait() // wait for all goroutines to finish

This way, the program will reliably wait for all goroutines to finish before continuing or exiting.