Why do you insert data into the channel and take it out immediately? What's the effect？

[艾宾浩斯的美酒]

grpool/grpool.go

Line 55 in 28957a2

 worker.stop <- struct{}{} 

[valiner]

wait worker stop task(Maybe it's a time-consuming stop) like

                            case <-w.stop:
                                // do somethine
				w.stop <- struct{}{}
				return

[科科人神]

The previous sending and receiving operation is to transmit the signal to start the stop, and the following sending and receiving operation is to complete the execution.