How to implement synchronous waiting for the completion of multiple parallel tasks in a program written in Go?

In Go, sync.WaitGroup is commonly used to wait for the completion of multiple parallel tasks. It allows you to start several goroutines and wait for their completion.

Example:

package main

import (
    "fmt"
    "sync"
)

func worker(id int, wg *sync.WaitGroup) {
    defer wg.Done() // Notify WaitGroup that the task is done
    fmt.Printf("Worker %d started\n", id)
    // simulate work
    // time.Sleep(time.Second)
    fmt.Printf("Worker %d finished\n", id)
}

func main() {
    var wg sync.WaitGroup
    numWorkers := 3

    wg.Add(numWorkers) // Set the number of tasks

    for i := 1; i <= numWorkers; i++ {
        go worker(i, &wg)
    }

    wg.Wait() // Wait for all goroutines to finish
    fmt.Println("All workers finished")
}

Thus, WaitGroup allows for efficient synchronization of parallel tasks.