signal-1.go

package main

import "os";
import "syscall";
import "fmt";
import "os/signal";

var GLOBAL_SIGNAL := make(chan bool, 1);

func is_alive () bool {
    state := <- GLOBAL_SIGNAL;
    GLOBAL_SIGNAL <- state
    return state;
}

func job (num int){
    fmt.Printfln("Job %v: start ...", num);
    for {
        if !is_alive() {
            break;
        }
        // do something 
    }
    fmt.Printfln("Job %v: stop ...", num);
}

func main (){
    var c := make(chan os.Signal, 1);
    signal.Notify(c, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT);
    go func(){
        GLOBAL_SIGNAL <- true
        _ := <- c
        GLOBAL_SIGNAL <- false
    }();

    go job(1);
    go job(2);
    go job(3);
}

signal-2.go

package main

import "os";
import "syscall";
import "fmt";
import "os/signal";

var GLOBAL_SIGNAL := 0;

func is_alive () bool {
    return GLOBAL_SIGNAL == 0;
}

func job (num int) {
    fmt.Printfln("Job %v: start ...", num);
    for {
        if !is_alive() {
            break;
        }
        // do something 
    }
    fmt.Printfln("Job %v: stop ...", num);
}

func main (){
    var c := make(chan os.Signal, 1);
    signal.Notify(c, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT);
    go func(){
        _ := <- c
        GLOBAL_SIGNAL = 1;
    }();
    go job(1);
    go job(2);
    go job(3);
}