package main

import (
    "fmt"
    "time"
)

func main() {
    var (
        foo_completed bool = false
        bar_completed bool = false
        completed bool = false
    )
    for completed == false {
        sharedChan := make(chan string, 1)
        go foo(sharedChan)
        go bar(sharedChan)
        select {
        case sharedChan <- "starting foo":
            fmt.Println("starting up foo goroutine")
        case sharedChan <- "starting bar":
            fmt.Println("starting up bar goroutine")
        case sharedChan <- "done foo":
            fmt.Println("foo goroutine done")
            foo_completed = true
        case sharedChan <- "done bar":
            fmt.Println("bar goroutine done")
            bar_completed = true
        }
        if foo_completed && bar_completed {
            completed = true;
        }
    }
    fmt.Println("All goroutines have completed.")
}

func foo(c chan string) {
    c <- "starting foo"
    time.Sleep(1*time.Minute)
    c <- "done foo"
}

func bar(c chan string) {
    c <- "starting bar"
    time.Sleep(2*time.Minute)
    c <- "done bar"
}