refactoring to use atomic bool

fix compilation

weed/util/log_buffer/log_buffer.go

@@ -3,6 +3,7 @@ package log_buffer
 import (
 	"bytes"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"google.golang.org/protobuf/proto"
@@ -34,7 +35,7 @@ type LogBuffer struct {
 	flushInterval time.Duration
 	flushFn       func(startTime, stopTime time.Time, buf []byte)
 	notifyFn      func()
-	isStopping    bool
+	isStopping    *atomic.Bool
 	flushChan     chan *dataToFlush
 	lastTsNs      int64
 	sync.RWMutex
@@ -50,6 +51,7 @@ func NewLogBuffer(name string, flushInterval time.Duration, flushFn func(startTi
 		flushFn:       flushFn,
 		notifyFn:      notifyFn,
 		flushChan:     make(chan *dataToFlush, 256),
+		isStopping:    new(atomic.Bool),
 	}
 	go lb.loopFlush()
 	go lb.loopInterval()
@@ -119,20 +121,14 @@ func (m *LogBuffer) AddToBuffer(partitionKey, data []byte, processingTsNs int64)
 }
 
 func (m *LogBuffer) IsStopping() bool {
-	m.RLock()
-	defer m.RUnlock()
-
-	return m.isStopping
+	return m.isStopping.Load()
 }
 
 func (m *LogBuffer) Shutdown() {
-	m.Lock()
-	defer m.Unlock()
-
-	if m.isStopping {
+	isAlreadyStopped := m.isStopping.Swap(true)
+	if isAlreadyStopped {
 		return
 	}
-	m.isStopping = true
 	toFlush := m.copyToFlush()
 	m.flushChan <- toFlush
 	close(m.flushChan)