From fa89b4cd58f4b71fdcda3736e10ded1bad263aaf Mon Sep 17 00:00:00 2001
From: 554325746@qq.com <554325746@qq.com>
Date: 星期三, 21 八月 2019 10:31:17 +0800
Subject: [PATCH] add shm timeout

---
 shm.go |   55 +++++++++++++++++++++++++++++++++++++++++++++----------
 1 files changed, 45 insertions(+), 10 deletions(-)

diff --git a/shm.go b/shm.go
index 8d40445..5a87130 100644
--- a/shm.go
+++ b/shm.go
@@ -5,6 +5,8 @@
 	"fmt"
 	"io"
 
+	"time"
+
 	"github.com/tmthrgd/shm-go"
 )
 
@@ -20,12 +22,26 @@
 		return errors.New("please init shm producer first")
 	}
 
-	n, err := s.rw.Write(data)
-	if n < 1 {
-		fmt.Println("recv data less than 1 length")
+	ch := make(chan int)
+	go func(){
+		n, _ := s.rw.Write(data)
+		ch <- n
+	}()
+	select{
+	case <-ch:
+		return nil
+	case <- time.After(3 * time.Second):
+		return errors.New("send time out")
 	}
 
-	return err
+	return errors.New("send should't here")
+
+	// n, err := s.rw.Write(data)
+	// if n < 1 {
+	// 	fmt.Println("recv data less than 1 length")
+	// }
+
+	// return err
 }
 
 // Recv impl interface Diliver
@@ -35,14 +51,33 @@
 		return nil, errors.New("please open shm consumer first")
 	}
 
-	data := make([]byte, maxRecvSize)
-	n, err := s.rw.Read(data)
-	if err == nil || err == io.EOF {
-		data = data[:n:n]
-		return data, nil
+	ch := make(chan []byte)
+	go func(){
+		data := make([]byte, maxRecvSize)
+		n, err := s.rw.Read(data)
+		if err == nil || err == io.EOF {
+			data = data[:n:n]
+		}
+		ch <- data
+	}()
+	select{
+	case d := <-ch:
+		return d, nil
+	case <- time.After(3 * time.Second):
+		return nil, errors.New("recv time out")
 	}
 
-	return nil, err
+	return nil, errors.New("recv should't here")
+
+
+	// data := make([]byte, maxRecvSize)
+	// n, err := s.rw.Read(data)
+	// if err == nil || err == io.EOF {
+	// 	data = data[:n:n]
+	// 	return data, nil
+	// }
+
+	// return nil, err
 }
 
 // Close impl interface Deliver

--
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