package main
 
import (
 "fmt"
 "sync"
 "time"
)
 
func main() {
 jobs := make(chan int)
 var wg sync.WaitGroup
 go func() {
 time.Sleep(time.Second * 3)
 close(jobs)
 }()
 go func() {
 for i := 0; ; i++ {
 jobs <- i
 fmt.Println("produce:", i)
 }
 }()
 wg.Add(1)
 go func() {
 defer wg.Done()
 for i := range jobs {
 fmt.Println("consume:", i)
 }
 }()
 wg.Wait()
}

produce: 33334
consume: 33334
consume: 33335
produce: 33335
produce: 33336
consume: 33336
consume: 33337
produce: 33337
produce: 33338
consume: 33338
consume: 33339
produce: 33339
produce: 33340
consume: 33340
panic: send on closed channel
 
goroutine 19 [running]:
panic(0x49b660, 0xc042410bb0)
  C:/Go/src/runtime/panic.go:500 +0x1af
main.main.func2(0xc04203a180)
  C:/Users/tanteng/Go/src/examples/channel_close.go:18 +0x6b
created by main.main
  C:/Users/tanteng/Go/src/examples/channel_close.go:21 +0xb8
exit status 2

package main
 
import (
 "fmt"
 "sync"
 "time"
)
 
func main() {
 jobs := make(chan int)
 timeout := make(chan bool)
 var wg sync.WaitGroup
 go func() {
 time.Sleep(time.Second * 3)
 timeout <- true
 }()
 go func() {
 for i := 0; ; i++ {
 select {
 case <-timeout:
 close(jobs)
 return
 
 default:
 jobs <- i
 fmt.Println("produce:", i)
 }
 }
 }()
 wg.Add(1)
 go func() {
 defer wg.Done()
 for i := range jobs {
 fmt.Println("consume:", i)
 }
 }()
 wg.Wait()
}