Creating a worker pool in Go using channel and go routines

workerPool.go

package main

import (
	"fmt"
  "time"
)

func main() {
  numJobs := 20
  limit := numJobs * 2
  
  jobs := make(chan int , numJobs)
  results := make(chan int , numJobs)

  // routines to handle the calculations
  for w:= 1 ; w <= 3; w++ {
    go worker(w, jobs, results)
  }

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

  fmt.Print("Result after processing jobs: ")

  for res:= range results {
    fmt.Println("result is",res) 
    if res == limit {
      fmt.Println("Reached the end", res)
      close (results)
    }
  }

}

// result is send-only chan, jobs read-only 
func worker(id int , jobs <- chan int, results chan <- int ){
  for j:= range jobs {
    fmt.Println("Worker: ", id, " started job" )
    time.Sleep(time.Second)
    fmt.Println("Worker: ", id, " has finished job", j)
    results <- j * 2
  }
}