Concurrent programming examples

This is a creation in Article, where the information may have evolved or changed.

Using the Golang Timer

Scheduled Tasks

func demo(input chan interface{}) {    t1 := time.NewTimer(time.Second * 5)    t2 := time.NewTimer(time.Second * 10)    for {        select {        case msg <- input:            println(msg)        case <-t1.C:            println("5s timer")            t1.Reset(time.Second * 5)        case <-t2.C:            println("10s timer")            t2.Reset(time.Second * 10)        }    }}

Staccato device

func main(){    ticker := time.NewTicker(time.Second)    for t := range ticker.C {        fmt.Println("ticker", t)    }}

Timeout

func main(){    ch1 := make(chan int, 1)    ch2 := make(chan int, 1)    select {        case e1 := <-ch1:        //如果ch1通道成功读取数据，则执行该case处理语句            fmt.Printf("1th case is selected. e1=%v",e1)        case e2 := <-ch2:        //如果ch2通道成功读取数据，则执行该case处理语句            fmt.Printf("2th case is selected. e2=%v",e2)        case <- time.After(2 * time.Second):            fmt.Println("Timed out")    }}

Custom Timers

func main(){    var t *time.Timer    f := func(){        fmt.Printf("Expiration time : %v.\n", time.Now())        fmt.Printf("C`s len: %d\n", len(t.C))    }    t = time.AfterFunc(1*time.Second, f)    //让当前Goroutine 睡眠2s，确保大于内容的完整    //这样做原因是，time.AfterFunc的调用不会被阻塞。它会以一部的方式在到期事件来临执行我们自定义函数f。    time.Sleep(2 * time.Second)}

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