<9> go worker线程池

Worker Pools

package main
import "fmt"
import "time"
// 使用goroutine  开启大小为3的线程池
// 其中1个channel为执行做通信，1个对结果进行保存

// 创建的worker
func worker(id int, jobs <-chan int, results chan<- int) {
    for j := range jobs {
        fmt.Println("worker", id, "processing job", j)
        time.Sleep(time.Second)
        results <- j * 2
    }
}
func main() {
    // 创建channel
    jobs := make(chan int, 100)
    results := make(chan int, 100)
    // 3个worker作为一个pool
    for w := 1; w <= 3; w++ {
        go worker(w, jobs, results)
    }

    // 发送9个jobs，然后关闭
    for j := 1; j <= 9; j++ {
        jobs <- j
    }
    close(jobs)

    // 最后收集结果
    for a := 1; a <= 9; a++ {
        <-results
    }
}

输出：
worker 1 processing job 1
worker 2 processing job 2
worker 3 processing job 3
worker 1 processing job 4
worker 2 processing job 5
worker 3 processing job 6
worker 1 processing job 7
worker 2 processing job 8
worker 3 processing job 9
real 0m3.149s