Created
February 6, 2013 15:25
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package main | |
import ( | |
"fmt" | |
"runtime" | |
"sync" | |
"time" | |
) | |
func main() { | |
runtime.GOMAXPROCS(runtime.NumCPU()) | |
in := input_gen(10) | |
out1 := stage1_gen(in, 2) | |
out2 := stage2_gen(out1, 3) | |
for o := range out2 { | |
p("output: ", o) | |
} | |
} | |
func input_gen(count int) chan int { | |
in := make(chan int) | |
go func() { | |
defer close(in) | |
for i := 0; i < count; i++ { | |
in <- i | |
} | |
}() | |
return in | |
} | |
func stage1_gen(in <-chan int, limit int) chan int { | |
out := make(chan int) | |
wg := CloseTrigger(limit, func() { close(out) }) | |
for j := 0; j < limit; j++ { | |
go func() { | |
defer wg.Done() | |
for i := range in { | |
p("start stage 1 worker with input", i) | |
time.Sleep(time.Second / 2) | |
p("exit stage 1 worker with input", i) | |
out <- i | |
} | |
}() | |
} | |
return out | |
} | |
func stage2_gen(in <-chan int, limit int) chan int { | |
out := make(chan int) | |
wg := CloseTrigger(limit, func() { close(out) }) | |
for j := 0; j < limit; j++ { | |
go func() { | |
defer wg.Done() | |
for i := range in { | |
p("start stage 2 worker with input", i) | |
time.Sleep(time.Second / 2) | |
p("exit stage 2 worker with input", i) | |
out <- i | |
} | |
}() | |
} | |
return out | |
} | |
func CloseTrigger(limit int, f func()) *sync.WaitGroup { | |
wg := new(sync.WaitGroup) | |
wg.Add(limit) | |
go func() { | |
wg.Wait() | |
f() | |
}() | |
return wg | |
} | |
func p(v ...interface{}) { | |
fmt.Println(v...) | |
} |
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