golang-net

//交替打印
func main() {
    letterC := make(chan bool)
    numberC := make(chan bool)

    wg.Add(2)

    go func() {
        defer wg.Done()

        letters := []rune{'a', 'b', 'c'}
        for _, letter := range letters {
            <-letterC
            fmt.Printf("%c ", letter)
            numberC <- true
            if letter == 'c' {
                break
            }
        }
        close(letterC)
    }()

    go func() {
        defer wg.Done()

        numbers := []int{1, 2, 3}
        for _, number := range numbers {
            <-numberC
            fmt.Printf("%d ", number)
            if number == 3 {
                break
            }
            letterC <- true
        }

        close(numberC)
    }()

    letterC <- true

    wg.Wait()
}

//我的方案
func main() {
    one := make(chan int)
    two := make(chan int)

    wg.Add(2)

    go func() {
        defer wg.Done()

        for i := 1; i <= 5; i += 2 {
            //把1从one中取出来
            <-one
            println(i)
            //把2放入two中
            two <- (i + 1)

            if i == 5 {
                break
            }
        }

        close(one)
    }()

    go func() {
        defer wg.Done()

        for i := 2; i <= 6; i += 2 {
            //把2从two中取出来
            <-two
            println(i)
            if i == 6 {
                break
            }
            //把1放入one中
            one <- (i + 1)
        }

        close(two)
    }()

    //把1放入one中
    one <- 1
    wg.Wait()
}
//https://dbwu.tech/posts/goroutine_alternate_print/

这里一定把关闭有阻塞的channel，不然会死锁

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