How do I use the sync package in Go?

How do I use the sync package in Go?

The sync package in Go provides basic synchronization primitives such as mutual exclusion locks and wait groups. What specific functionality are you interested in?

Can you explain how to use a WaitGroup?

Sure! A WaitGroup is used to wait for a collection of goroutines to finish executing. You can add to the WaitGroup with Add(n), where n is the number of goroutines you are waiting for. After starting each goroutine, you call Done() when it finishes, and finally, you call Wait() to block until all goroutines have completed.

Can you show me a code example?

Absolutely! Here's a simple example:

package main

import (
    "fmt"
    "sync"
)

func main() {
    var wg sync.WaitGroup

    for i := 1; i <= 3; i++ {
        wg.Add(1)
        go func(i int) {
            defer wg.Done()
            fmt.Printf("Goroutine %d is running\n", i)
        }(i)
    }

    wg.Wait()
    fmt.Println("All goroutines finished.")
}

What about using Mutex for locking?

A Mutex is used to provide mutual exclusion, ensuring that only one goroutine can access a resource at a time. You can lock it with Lock() and unlock it with Unlock(). Would you like a code example for that as well?