Lockdown Learning – Day #46– Play more with WaitGroup in GoLang (Music Only)

Continuing with our lockdown learning of Go language. Here’s a video where we Play more with WaitGroup in Golang

package main

import (
	"fmt"
	"sync"
)

func main() {
	wg := sync.WaitGroup{} //a structure
	fmt.Println(wg)

	wg.Add(1)
	//go doSomething(wg) //Passing a copy of waitgroup. So no modifications to the original
	go doSomething(&wg)
	
        //wg.Add(1) //Wait for 1 go routine to finish
	//wg.Add(2)//Wait for 2 go routines to finish. But we have only one GoRoutine. hmm
	//This delta: <number> is equal to the number of times Done() gets called from goroutines

	//go func() {
	//	fmt.Println("...Inside goroutine 1")
	//	wg.Done()
	//	wg.Done() //Silly isn't it?
	//	wg.Done()//panic: sync: negative WaitGroup counter
	//
	//}()
	wg.Wait()
	fmt.Println("****END")

}
func doSomething(wg *sync.WaitGroup)  {
	fmt.Println("...DoSomething")
	wg.Done()
}