diff --git a/include/private/ui/SharedState.h b/include/private/ui/SharedState.h
index 3bc7979..c9f6b5e 100644
--- a/include/private/ui/SharedState.h
+++ b/include/private/ui/SharedState.h
@@ -98,6 +98,8 @@
 
 struct per_client_cblk_t   // 4KB max
 {
+    per_client_cblk_t() : lock(Mutex::SHARED) { }
+
                 Mutex           lock;
                 Condition       cv;
                 layer_cblk_t    layers[NUM_LAYERS_MAX] __attribute__((aligned(32)));
diff --git a/include/utils/threads.h b/include/utils/threads.h
index 5c03965..e9b0788 100644
--- a/include/utils/threads.h
+++ b/include/utils/threads.h
@@ -190,8 +190,14 @@
  */
 class Mutex {
 public:
+    enum {
+        NORMAL = 0,
+        SHARED = 1
+    };
+    
                 Mutex();
                 Mutex(const char* name);
+                Mutex(int type, const char* name = NULL);
                 ~Mutex();
 
     // lock or unlock the mutex
@@ -235,6 +241,17 @@
 inline Mutex::Mutex(const char* name) {
     pthread_mutex_init(&mMutex, NULL);
 }
+inline Mutex::Mutex(int type, const char* name) {
+    if (type == SHARED) {
+        pthread_mutexattr_t attr;
+        pthread_mutexattr_init(&attr);
+        pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
+        pthread_mutex_init(&mMutex, &attr);
+        pthread_mutexattr_destroy(&attr);
+    } else {
+        pthread_mutex_init(&mMutex, NULL);
+    }
+}
 inline Mutex::~Mutex() {
     pthread_mutex_destroy(&mMutex);
 }