package main
import (
"context"
"fmt"
"net/http"
_ "net/http/pprof"
"time"
)
func main() {
go http.ListenAndServe(":8080", nil)
ctx, _ := context.WithTimeout(context.Background(), (10 * time.Second))
go testA(ctx)
select {}
}
func testA(ctx context.Context) {
ctxA, _ := context.WithTimeout(ctx, (1 * time.Second))
ch := make(chan int)
go testB(ctxA, ch)
select {
case <-ctx.Done():
fmt.Println("testA Done")
return
case i := <-ch:
fmt.Println(i)
}
}
func testB(ctx context.Context, ch chan int) {
//模拟读取数据
sumCh := make(chan int)
go func(sumCh chan int) {
sum := 10
time.Sleep(10 * time.Second)
sumCh <- sum
}(sumCh)
select {
case <-ctx.Done():
fmt.Println("testB Done")
<-sumCh
return
//case ch <- <-sumCh: 注意这样会导致资源泄露
case i := <-sumCh:
fmt.Println("send", i)
ch <- i
}
}