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package main | |
import ( | |
"fmt" | |
"sync" | |
"time" | |
) | |
func main() { | |
wg := sync.WaitGroup{} | |
wg.Add(1) | |
input := run(&wg) | |
for i:=0; i < 10; i++ { | |
input <- i+1 | |
time.Sleep(time.Millisecond * 20) | |
} | |
close(input) | |
fmt.Println("close") | |
wg.Wait() | |
} | |
func run(wg *sync.WaitGroup) (input chan int) { | |
input = make(chan int) | |
work := make(chan int) | |
var items []int | |
go func() { | |
defer wg.Done() | |
for w := range work { | |
fmt.Println("work", w) | |
time.Sleep(time.Second * 2) | |
} | |
}() | |
go func() { | |
mainLoop: for { | |
var item int | |
var sendWork chan int | |
inner: for len(items) > 0 { | |
sendWork = work | |
item = items[0] | |
select { | |
case sendWork <- item: | |
fmt.Println("send to worker", item) | |
items = items[1:] | |
case default: | |
break inner | |
} | |
} | |
select { | |
case i, ok :=<-input: | |
if ok { | |
fmt.Println("receive", i) | |
items = append(items, i) | |
} else if len(items) == 0 { | |
fmt.Println("Close queue") | |
close(work) | |
break mainLoop | |
} | |
case sendWork <- item: | |
fmt.Println("send to worker", item) | |
items = items[1:] | |
} | |
} | |
}() | |
return | |
} |
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