diff --git a/src/lynq/lib/liblynq-shm/lynq_shm.cpp b/src/lynq/lib/liblynq-shm/lynq_shm.cpp
index 3d27575..e06ca96 100755
--- a/src/lynq/lib/liblynq-shm/lynq_shm.cpp
+++ b/src/lynq/lib/liblynq-shm/lynq_shm.cpp
@@ -18,6 +18,8 @@
 
 int shmid=-1; 
 
+static int s_use_count=0;
+
 typedef struct{
     int num_of_buffer;
     int size_of_buffer;
@@ -142,10 +144,10 @@
 {
     if(shmid!=-1)
     {
-        if (shmctl(shmid, IPC_RMID, NULL) == -1) 
+        if (shmdt(s_ril_shm_buf) != 0) 
         {
-            RLOGE("shmctl error.\n");       
-        }
+            RLOGE("shmdt error.\n");      
+        }        
         shmid = -1;
     }
     s_ril_shm_buf = (void*) -1L;
@@ -154,16 +156,39 @@
 
 int ril_init_mem()
 {   
-    if(create_shm()!=0)
-    {
-        return -1;
+    pthread_mutex_lock(&s_shm_mtx);
+    RLOGE("init begin, use count is %d.\n",s_use_count);      
+    if(s_use_count==0)
+    {
+        if(create_shm()!=0)
+        {
+            RLOGE("init end, use count is %d.\n",s_use_count);       
+            pthread_mutex_unlock(&s_shm_mtx);
+            return -1;
+        }    
     }
+    s_use_count++;
+    RLOGE("init end, use count is %d.\n",s_use_count);       
+    pthread_mutex_unlock(&s_shm_mtx);
     return 0;
 }
 
 void ril_deinit_mem()
 {
-    remove_shm();   
+    pthread_mutex_lock(&s_shm_mtx);
+
+    RLOGE("de-init begin, use count is %d.\n",s_use_count);      
+    if(s_use_count==1)
+    {
+        remove_shm();        
+    }
+
+    if(s_use_count>0)
+    {
+        s_use_count--;    
+    }
+    RLOGE("de-init end, use count is %d.\n",s_use_count);      
+    pthread_mutex_unlock(&s_shm_mtx);
     return ;
 }