<span style="font-size:18px;color:#3333ff;">package main
import (
"golang.org/x/net/context"
"log"
"math/rand"
"time"
)
func test(is_first *bool, prev_map *map[string]string) {
rand.Seed(int64(time.Now().Nanosecond()))
ch := make(chan bool)
ctx, _ := context.WithTimeout(context.Background(), 50*time.Millisecond)
go func() {
if *is_first {
(*prev_map)["a"] = "1"
} else {
(*prev_map)["a"] = "2"
}
time.Sleep(time.Duration(rand.Intn(100)) * time.Millisecond)
ch <- true
}()
select {
case <-ch:
*is_first = false
(*prev_map)["b"] = "fast"
return
case <-ctx.Done():
*is_first = true
(*prev_map)["b"] = "slow"
return
}
}
func main() {
is_first := true
prev_map := make(map[string]string)
for {
test(&is_first, &prev_map)
time.Sleep(time.Second)
log.Println(prev_map, is_first)
}
}</span>
<span style="font-size:18px;color:#3333ff;">[work@localhost test]$ go run main.go
2016/08/18 23:22:26 map[a:1 b:fast] false
2016/08/18 23:22:27 map[a:2 b:slow] true
2016/08/18 23:22:28 map[a:1 b:slow] true
2016/08/18 23:22:29 map[a:1 b:fast] false
2016/08/18 23:22:30 map[b:fast a:2] false
2016/08/18 23:22:31 map[b:slow a:2] true
2016/08/18 23:22:32 map[a:1 b:fast] false
2016/08/18 23:22:33 map[a:2 b:slow] true
2016/08/18 23:22:34 map[a:1 b:slow] true
2016/08/18 23:22:35 map[a:1 b:slow] true
2016/08/18 23:22:36 map[a:1 b:slow] true
^Csignal: interrupt</span>
不要企图终止goroutine，在select 中用方法包装管道来实现。
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