``` go
package main
import (
"fmt"
"math/rand"
"sync"
)
func main() {
c := sync.NewCond(&sync.Mutex{})
queueList := make(chan int, 10)
//producer
go func() {
for {
c.L.Lock()
if len(queueList) == 5 {
c.Wait()
}
num := rand.Intn(100)
fmt.Println("Producer:", num)
queueList <- num
if len(queueList) == 5 {
c.Signal()
}
c.L.Unlock()
}
}()
//consumer
go func() {
for {
c.L.Lock()
if len(queueList) == 0 {
c.Wait()
}
num := <- queueList
fmt.Println("consumer:", num)
if len(queueList) == 0 {
c.Signal()
}
c.L.Unlock()
}
}()
for {
;
}
}
```
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