closing channel _ golang

Closing a channel indicates that no more values will be sent on it. This can be useful  to communicate completion to the channel's receivers.

package main

import (
    "fmt"
)

func main() {

    jobs := make(chan int, 5)
    done := make(chan bool)

    go func() {
        for {
            j, more := <-jobs
            if more {
                fmt.Println("received job", j)
            } else {
                fmt.Println("received all jobs")
                done <- true
                return
            }
        }
    }()

    for j := 1; j <= 3; j++ {
        jobs <- j
        fmt.Println("sent job", j)
    }
    close(jobs)
    fmt.Println("sent all jobs")
    fmt.Println("<-done", <-done)
}

sent job 1
sent job 2
sent job 3
sent all jobs
received job 1
received job 2
received job 3
received all jobs
<-done true

总结 :

　　1 :....