go wait group

tags: learning go programming

content

• we can use channel to block the main thread to achieve the goal of waiting
• or we can use WaitGroup to wait for threads to finish
• main thread needs to add each child thread into the WaitGroup
• each child thread needs to update its done status when it’s done
• WaitGroup needs to be passed by reference (pointer) to child threads

func worker(..., wg *sync.WaitGroup) {
	defer wg.Done()  // need to tell wg im done
	... do something
}
func main() {
	var wg sync.WaitGroup
	...
	go worker(..., &wg)
	wg.Wait()
}

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