diff --git a/samgr/adapter/posix/queue_adapter.c b/samgr/adapter/posix/queue_adapter.c
index da7f0319479d0f14a33acb55adcde10e8b8018d9..376296e8120b9010c41130fef410152e29849b6c 100644
--- a/samgr/adapter/posix/queue_adapter.c
+++ b/samgr/adapter/posix/queue_adapter.c
@@ -67,9 +67,11 @@ int QUEUE_Pop(MQueueId queueId, void *element, uint8 *pri, int timeout)
     LockFreeBlockQueue *queue = (LockFreeBlockQueue *)queueId;
     pthread_mutex_lock(&queue->rMutex);
     if (LFQUE_Pop(queue->queue, element, pri) == EC_SUCCESS) {
+        pthread_mutex_unlock(&queue->rMutex);
         return EC_SUCCESS;
     }
 
+    pthread_mutex_lock(&queue->rMutex);
     while (LFQUE_Pop(queue->queue, element, pri) != EC_SUCCESS) {
         pthread_cond_wait(&queue->cond, &queue->rMutex);
     }