NSQ inside waitgroups Two kinds of practical usage

I have seen it several times, I think it is very practical, keep a record.

1. After opening a lot of goroutine, wait for execution to complete.

struct {    *waitgroupwrapper) Wrap (CB func ()) {    W.add (1)    go func () {        CB ()        w.done ()    } ()}//  can be used as follows:WG: = WAITGROUPWRAPPER{}WG. Wrap (func () {n.idpump ()}) ... WG. Wait ()

2. Program to close, notify each goroutine safe exit

func work () {Exitchan:= Make (chanint) Go Task1 (Exitchan) go Task2 (Exitchan) time. Sleep (5*Time . Second) Close (Exitchan)}func Task1 (Exitchan Chanint) {    <-Exitchan Log. Printf ("Task1 exiting")}func Task2 (Exitchan Chanint) {    <-Exitchan Log. Printf ("Task2 exiting")}

Original reference:

Http://nsq.io/overview/internals.html

NSQ inside waitgroups Two kinds of practical usage