Delayed start

---

examples/delayed-start/delayed_start.go

package main

import (
    "fmt"
    "time"
)

func main() {
    ch := make(chan int)
    go start(ch)
    fmt.Println("now")
    ch <- 23
    time.Sleep(1000)
    ch <- 19
    time.Sleep(1000)
    ch <- 42

    time.Sleep(10000000)
    fmt.Println("end")
}

func start(in <-chan int) {
    fmt.Println("start")

    var port int
    received := time.Now()
LOOP:
    for {
        select {
        case port = <-in:
            received = time.Now()
            fmt.Printf("received port %v at %v\n", port, received)
        default:
            now := time.Now()
            elapsed := now.Sub(received)
            if elapsed > 1000000 {
                if port != 0 {
                    fmt.Printf("delayed start on port %v\n", port)

                } else {
                    fmt.Println("No port received")
                }
                break LOOP
            }
        }
        time.Sleep(1000)
    }
    fmt.Println("start done")
}