fix the bug in unit tests about sync.Pool

Signed-off-by: SataQiu <1527062125@qq.com>

pkg/pool/buffer_pool_test.go

@@ -1,3 +1,6 @@
+// BufferPool is no-op under race detector, so all these tests do not work.
+// +build !race
+
 /*
  * Copyright The Dragonfly Authors.
  *
@@ -18,6 +21,7 @@ package pool
 
 import (
 	"fmt"
+	"runtime"
 	"testing"
 
 	"github.com/stretchr/testify/suite"
@@ -51,6 +55,11 @@ func (s *BufferPoolTestSuite) TestAcquireBuffer() {
 }
 
 func (s *BufferPoolTestSuite) TestReleaseBuffer() {
+	// Limit to 1 processor to make sure that the goroutine doesn't migrate
+	// to another P between AcquireBuffer and ReleaseBuffer calls.
+	prev := runtime.GOMAXPROCS(1)
+	defer runtime.GOMAXPROCS(prev)
+
 	buf1 := AcquireBuffer()
 	ReleaseBuffer(buf1)
 	ReleaseBuffer(nil)

pkg/pool/writer_pool_test.go

@@ -1,3 +1,6 @@
+// WriterPool is no-op under race detector, so all these tests do not work.
+// +build !race
+
 /*
  * Copyright The Dragonfly Authors.
  *
@@ -19,13 +22,19 @@ package pool
 import (
 	"bytes"
 	"io/ioutil"
+	"runtime"
 	"sync"
 	"testing"
 
 	"github.com/stretchr/testify/require"
 )
 
 func TestWriter(t *testing.T) {
+	// Limit to 1 processor to make sure that the goroutine doesn't migrate
+	// to another P between AcquireWriter and ReleaseWriter calls.
+	prev := runtime.GOMAXPROCS(1)
+	defer runtime.GOMAXPROCS(prev)
+
 	tmp := writerPool
 	writerPool = &sync.Pool{}