Milliseid funktsioone pakub WaitGroup struktuur Go keeles goroutine'ide sünkroniseerimiseks?

In the Go language, the sync.WaitGroup structure is used to synchronize multiple goroutines, allowing the main goroutine to wait for others to complete.

Main methods of WaitGroup:

• Add(delta int) — increases or decreases the counter of expected goroutines. Usually called before starting goroutines.

• Done() — decreases the counter by 1, called at the end of a goroutine's work.

• Wait() — blocks execution until the counter reaches zero.

Example of usage:

var wg sync.WaitGroup

wg.Add(3) // waiting for 3 goroutines

for i := 0; i < 3; i++ {
    go func(id int) {
        defer wg.Done() // signal completion
        fmt.Println("Goroutine", id)
    }(i)
}

wg.Wait() // wait for all goroutines to finish
fmt.Println("All goroutines completed")

Thus, WaitGroup helps coordinate parallel execution and ensures that the program does not terminate prematurely.