package main

import (
	"fmt"
	"time"
)

func worker(id int, jobs <-chan int, results chan<- int) {
	for j := range jobs {
		fmt.Println("worker", id, "started job", j)
		time.Sleep(time.Second)
		fmt.Println("worker", id, "finished job", j)
		results <- j * 2
	}
}

// work_pool练习
func main() {
	jobs := make(chan int, 100)
	results := make(chan int, 100)
	//开启三个goroutine
	for w := 1; w <= 3; w++ {
		go worker(w, jobs, results)
	}
	//五个任务，0-5的数字放到jobs这个通道中
	for j := 1; j <= 5; j++ {
		jobs <- j
	}
	//关闭job
	close(jobs)
	//把results这个通道中的数字，即jobs中的结果*2取出
	for a := 1; a <= 5; a++ {
		<-results
	}
}