Go Worker Pool

package main

import (
	"fmt"
	"sync"
)

func worker(id int, jobs <-chan int, results chan<- int, wg *sync.WaitGroup) {
	defer wg.Done()
	for job := range jobs {
		result := job * job // simulate work
		results <- result
		fmt.Printf("worker %d processed job %d -> %d\n", id, job, result)
	}
}

func main() {
	const numWorkers = 3
	const numJobs = 10

	jobs := make(chan int, numJobs)
	results := make(chan int, numJobs)
	var wg sync.WaitGroup

	for w := 1; w <= numWorkers; w++ {
		wg.Add(1)
		go worker(w, jobs, results, &wg)
	}

	for j := 1; j <= numJobs; j++ {
		jobs <- j
	}
	close(jobs)

	wg.Wait()
	close(results)

	for r := range results {
		fmt.Println("result:", r)
	}
}