diff --git a/inc/MESA_shm_ring_queue.h b/inc/MESA_shm_ring_queue.h
index 27b1e3e..ed9d712 100644
--- a/inc/MESA_shm_ring_queue.h
+++ b/inc/MESA_shm_ring_queue.h
@@ -16,7 +16,6 @@
 #define MESA_SHM_RING_QUEUE_HALF_IDLE    2
 #define MESA_SHM_RING_QUEUE_USED         3
 
-#define MESA_SEM_KEY                     35719
 
 #define MESA_CONSUMER_RUNNING        1
 #define MESA_CONSUMER_NOT_RUNNING    0
diff --git a/src/MESA_shm_ring_queue.c b/src/MESA_shm_ring_queue.c
index ce02b17..44c9ee6 100644
--- a/src/MESA_shm_ring_queue.c
+++ b/src/MESA_shm_ring_queue.c
@@ -14,6 +14,8 @@
 
 struct MESA_shm_overview *MESA_shm_ovw = NULL;
 int *MESA_consumer_status = NULL;
+struct MESA_shm_queue_head *MESA_ring_queue_head[MESA_SHM_RING_QUEUE_NUM] = {NULL};
+
 
 void MESA_shm_init_ring_queue_mutex(struct MESA_shm_overview *ovw)
 {
@@ -131,15 +133,21 @@ struct MESA_shm_queue_head *MESA_shm_alloc_new_ring_queue(struct MESA_shm_overvi
 	}
 	MESA_shm_init_new_ring_queue(head, ovw);
 	ovw->shmid = shmid;
+	MESA_ring_queue_head[ovw->idx] = head;
 	return head;	
 }
 
 struct MESA_shm_queue_head *MESA_shm_try_reuse_ring_queue(struct MESA_shm_overview *ovw)
 {
 	struct MESA_shm_queue_head *head = NULL;
-	head = (struct MESA_shm_queue_head *)shmat(ovw->shmid, NULL, 0);
-	if(head == (struct MESA_shm_queue_head *)-1){
-		return NULL;
+	if(MESA_ring_queue_head[ovw->idx] != NULL){
+		head = MESA_ring_queue_head[ovw->idx];
+	}else{
+		head = (struct MESA_shm_queue_head *)shmat(ovw->shmid, NULL, 0);
+		if(head == (struct MESA_shm_queue_head *)-1){
+			return NULL;
+		}
+		MESA_ring_queue_head[ovw->idx] = head;
 	}
 	return head;	
 }