<9> go worker线程池

Worker Pools

package mainimport "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workerfunc 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