package main

import (
    "fmt"
    "time"
)

func task1(exitChan chan int) {
    <-exitChan
    fmt.Println("task1 exiting")
}

func task2(exitChan chan int) {
    <-exitChan
    fmt.Println("task2 exiting")
}

func main() {
    exitChan := make(chan int)
    go task1(exitChan)
    go task2(exitChan)
    time.Sleep(2 * time.Second)
    close(exitChan)
}