add write nil func

circle.go

@@ -20,6 +20,7 @@ type StarBuffer struct {
 	pEnd    uint64
 	cap     uint64
 	isClose atomic.Value
+	isEnd   atomic.Value
 	rmu     sync.Mutex
 	wmu     sync.Mutex
 }
@@ -29,6 +30,7 @@ func NewStarBuffer(cap uint64) *StarBuffer {
 	rtnBuffer.cap = cap
 	rtnBuffer.datas = make([]byte, cap)
 	rtnBuffer.isClose.Store(false)
+	rtnBuffer.isEnd.Store(false)
 	return rtnBuffer
 }
 
@@ -48,7 +50,7 @@ func (star *StarBuffer) Len() uint64 {
 }
 
 func (star *StarBuffer) getByte() (byte, error) {
-	if star.isClose.Load().(bool) {
+	if star.isClose.Load().(bool) || (star.Len() == 0 && star.isEnd.Load().(bool)) {
 		return 0, io.EOF
 	}
 	if star.Len() == 0 {
@@ -97,7 +99,7 @@ func (star *StarBuffer) Close() error {
 	return nil
 }
 func (star *StarBuffer) Read(buf []byte) (int, error) {
-	if star.isClose.Load().(bool) {
+	if star.isClose.Load().(bool) || (star.Len() == 0 && star.isEnd.Load().(bool)) {
 		return 0, io.EOF
 	}
 	if buf == nil {
@@ -125,6 +127,10 @@ func (star *StarBuffer) Read(buf []byte) (int, error) {
 }
 
 func (star *StarBuffer) Write(bts []byte) (int, error) {
+	if bts == nil && !star.isEnd.Load().(bool) {
+		star.isEnd.Store(true)
+		return 0, nil
+	}
 	if bts == nil || star.isClose.Load().(bool) {
 		return 0, io.EOF
 	}

circle_test.go

@@ -59,3 +59,28 @@ func Test_Circle_Speed(t *testing.T) {
 	time.Sleep(time.Second * 10)
 	fmt.Println(count)
 }
+
+func Test_Circle_Speed2(t *testing.T) {
+	buf := NewStarBuffer(8192)
+	count := uint64(0)
+	for i := 1; i <= 10; i++ {
+		go func() {
+			for {
+				buf.Write([]byte("hello world b612 hello world b612 b612 b612 b612 b612 b612"))
+			}
+		}()
+	}
+	for i := 1; i <= 10; i++ {
+		go func() {
+			for {
+				mybuf := make([]byte, 1024)
+				j, err := buf.Read(mybuf)
+				if err == nil {
+					atomic.AddUint64(&count, uint64(j))
+				}
+			}
+		}()
+	}
+	time.Sleep(time.Second * 10)
+	fmt.Println(float64(count) / 10 / 1024 / 1024)
+}