goroutine usage

gistfile1.go

package main

import (
	"fmt"
	"time"
)

func main() {
	fmt.Println("hello")

	q := make(chan int)
	go producer(q)
	go consumer(q)
	go trigger(q)

	time.Sleep(5 * time.Second)
	fmt.Println("bye")
}

func producer(q chan int) {
	fmt.Println("p:", "started")
	var v int
	for {
		v = <-q
		fmt.Println("p:", v)
	}
	fmt.Println("p:", "finished")
}

func consumer(q chan int) {
	fmt.Println("c:", "started")
	for i := 0; i < 5; i++ {
		q <- i
		time.Sleep(1 * time.Second)
	}
	fmt.Println("c:", "finished")
}

func trigger(q chan int) {
	fmt.Println("t:", "started")
	time.Sleep(3 * time.Second)
	q <- 999
	fmt.Println("t:", "finished")
}