fix bug and improve implementation

.gitignore

@@ -13,3 +13,4 @@ _cgo*
 *.prof
 bench
 gonetbench
+main

main.go

@@ -4,29 +4,28 @@ import (
 	"flag"
 	"fmt"
 	"net"
-	"time"
-	"sync"
 	"os"
 	"os/signal"
+	"sync"
+	"syscall"
+	"time"
 )
 
 var (
 	Addr string
-	Cmd  string
 	Num  uint
 	Size uint
-	wg   sync.WaitGroup
-	quit chan bool
-	sc   chan bool // sent packets
-	lc   chan bool // lost packets
-	ac   chan bool // acctive connections
-	pc   chan bool // pending connections
-	ec   chan bool // error connections
+	quit chan struct{}
+	sc   chan struct{} // sent packets
+	lc   chan struct{} // lost packets
+	ac   chan struct{} // acctive connections
+	pc   chan struct{} // pending connections
+	ec   chan struct{} // error connections
 	pack []byte
 )
 
 func init() {
-	flag.UintVar(&Num, "n", 10, "number of concurrent clients")
+	flag.UintVar(&Num, "n", 10, "number of concurrent connections")
 	flag.UintVar(&Size, "s", 1, "packet size (in bytes)")
 	flag.Parse()
 
@@ -38,13 +37,13 @@ func init() {
 }
 
 func usage() {
-	fmt.Fprintf(os.Stderr, "Usage: time %s [options] addr cmd\n", os.Args[0])
+	fmt.Fprintf(os.Stderr, "Usage: %s [options] addr cmd\n", os.Args[0])
 	flag.PrintDefaults()
 }
 
-func status() {
-	wg.Add(1)
+func status(wg *sync.WaitGroup) {
 	defer wg.Done()
+
 	acs, ecs, pcs, scs, lcs := 0, 0, 0, 0, 0
 	fmt.Printf("Benchmarking %s with %d concurrent connections:\n\n", Addr, Num)
 	for {
@@ -71,54 +70,76 @@ func status() {
 
 func read(conn net.Conn) {
 	for {
-		buf := make([]byte, 1024)
-		conn.Read(buf)
+		select {
+		case <-quit:
+			return
+		default:
+			buf := make([]byte, 1024)
+			_, _ = conn.Read(buf)
+		}
 	}
 }
 
 func client() {
 	conn, err := net.Dial("tcp", Addr)
 	if err != nil {
-		ec <- true
+		ec <- struct{}{}
 		return
 	}
-	ac <- true
 	defer conn.Close()
+
+	ac <- struct{}{}
 	go read(conn)
 	for {
-		n, err := conn.Write(pack)
-		if err != nil || n != len(pack) {
-			lc <- true
+		select {
+		case <-quit:
+			return
+		default:
+			n, err := conn.Write(pack)
+			if err != nil || n != len(pack) {
+				lc <- struct{}{}
+			}
+			sc <- struct{}{}
+			<-time.After(1 * time.Second)
 		}
-		sc <- true
-		<-time.After(1 * time.Second)
 	}
 }
 
 func startAll() {
 	for i := 0; i < int(Num); i += 1 {
-		pc <- true
+		pc <- struct{}{}
 		go client()
 	}
 }
 
 func main() {
-	quit = make(chan bool)
-	ac = make(chan bool)
-	sc = make(chan bool)
-	pc = make(chan bool)
-	ec = make(chan bool)
-	lc = make(chan bool)
+	quit = make(chan struct{}, 2*Num+1)
+	ac = make(chan struct{}, 128)
+	sc = make(chan struct{}, 128)
+	pc = make(chan struct{}, 128)
+	ec = make(chan struct{}, 128)
+	lc = make(chan struct{}, 128)
 
 	pack = make([]byte, Size)
-	for i, _ := range pack {
+	for i := range pack {
 		pack[i] = 'x'
 	}
-
-	go status()
-	go startAll()
 
-	<-signal.Incoming
-	quit <- true
-	wg.Wait()
+	wg := &sync.WaitGroup{}
+	defer func() {
+		wg.Wait()
+	}()
+
+	wg.Add(1)
+	go status(wg)
+	startAll()
+
+	sig := make(chan os.Signal, 1)
+	signal.Notify(sig, os.Interrupt, syscall.SIGTERM, syscall.SIGINT)
+	<-sig
+
+	var i uint
+	for i = 0; i < 2*Num+1; i++ {
+		quit <- struct{}{}
+	}
 }