golang-groutine有序调度

本质上还是通过channel的队列性质(FIFO)来实现的，以这个思路为主。

func test1() {        
    var wg sync.WaitGroup

    var ch1 = make(chan int, 1)
    var ch2 = make(chan int, 1)
    var ch3 = make(chan int, 1)
    var printSelf func(pCont int, inChan chan int, outChan chan int)
    printSelf = func(pCont int, inChan chan int, outChan chan int) {
        defer wg.Done()

        select {
        case _ = <- inChan:
            fmt.Println("printVal: ", pCont)
        }
        outChan <- 0 //可以写入了
    }

    maxRun := 100
    maxGo := 3
    incr := 0

    ch1 <- 0
    for i := 0; i < ((maxRun/maxGo) + 1); i++ {
        wg.Add(3)
        go printSelf(incr, ch1, ch2)
        incr++
        go printSelf(incr, ch2, ch3)
        incr++
        go printSelf(incr, ch3, ch1)
        incr++
        wg.Wait()
    }        
}