생산자와 소비자가 메시지를 읽지 못하도록 제한하는 방법은 무엇입니까?

package main

import (
    "context"
    "fmt"
    "math/rand"
    "os"
    "os/signal"
    "sync"
    "syscall"
    "time"
)

func main() {
    const nConsumers = 2

    in := make(chan int, 10)
    p := Producer{&in}
    c := Consumer{&in, make(chan int, nConsumers)}
    go p.Produce()
    ctx, cancelFunc := context.WithCancel(context.Background())
    go c.Consume(ctx)
    wg := &sync.WaitGroup{}
    wg.Add(nConsumers)
    for i := 1; i <= nConsumers; i++ {
        go c.Work(wg, i)
    }
    termChan := make(chan os.Signal, 1)
    signal.Notify(termChan, syscall.SIGINT, syscall.SIGTERM)

    <-termChan

    cancelFunc()
    wg.Wait()
}

type Consumer struct {
    in   *chan int
    jobs chan int
}

func (c Consumer) Work(wg *sync.WaitGroup, i int) {
    defer wg.Done()
    for job := range c.jobs {
        fmt.Printf("Worker #%d start job %d\n", i, job)
        time.Sleep(time.Millisecond * time.Duration(3000+rand.Intn(3000)))
        fmt.Printf("Worker #%d finish job %d\n", i, job)
    }
    fmt.Printf("Worker #%d interrupted\n", i)
}

func (c Consumer) Consume(ctx context.Context) {
    for {
        select {
        case job := <-*c.in:
            c.jobs <- job
        case <-ctx.Done():
            close(c.jobs)
            fmt.Println("Consumer close channel")
            return
        }
    }
}

type Producer struct {
    in *chan int
}

func (p Producer) Produce() {
    task := 1
    for {
        *p.in <- task
        fmt.Printf("Send value %d\n", task)
        task++
        time.Sleep(time.Millisecond * 500)
    }
}