[Go] p1 producer-consumer

package main
//2020  Aion Algos#9218 http://discord.futuregadgetlab.net
import (
  "fmt"
  "time"
  "sync"
)

func main() {
  fmt.Println("Producer-Consumer example starting.")
  quantity := 30
  consumers := 3
  buffer := 3

  queue := make(chan int, buffer)

  var wg sync.WaitGroup
  wg.Add(consumers + 1)
  go producer(&wg, queue, quantity)
  for i := 0; i < consumers; i++ {
    go consumer(i, &wg, queue)
  }
  wg.Wait()
  fmt.Println("Producer-Consumer example complete.")
}

func consumer(id int, wg *sync.WaitGroup, queue <-chan int) {
  defer wg.Done()
  fmt.Println("Consumer", id, "started.")
  for q := range queue {
    fmt.Println("Consumer", id, "recieved:", q)
    time.Sleep(time.Millisecond * 200)
  }
  fmt.Println("Consumer", id, "done.")
}

func producer(wg *sync.WaitGroup, queue chan<- int, quantity int) {
  defer close(queue)
  defer wg.Done()
  fmt.Println("Producer started.")
  for i := 0; i < quantity; i++ {
    queue<- i
    fmt.Println("Producer - produced:", i)
  }
  fmt.Println("Producer done.")
}