channelrace2.go

package main

import (
    "fmt"
    "runtime"
    "time"
)

type State struct {
  counter int
}

func main() {
    fmt.Println("ready? start!")
    runtime.GOMAXPROCS(4)

    var send    = make(chan *State)

    fmt.Println("lauching race")
    go func() {
        var s1 = &State{0}
        fmt.Println("s1: ", s1.counter)
        send <- s1
        s1.counter = 1
        fmt.Println("s1: ", s1.counter)
        time.Sleep(5 * time.Second)
        fmt.Println("s1: ", s1.counter)
    }()
    go func() {
        s2 := <-send
        time.Sleep(100 * time.Millisecond)
        s2.counter = 3
        fmt.Println("s2: ", s2.counter)
    }()
    time.Sleep(10 * time.Second)
}