Added mutex timeout and mutex ownership

src/mutex.cpp

@@ -9,12 +9,16 @@ namespace sta
     class DummyMutex : public Mutex
     {
     public:
-        void acquire() override {}
+        bool isCurrentThreadOwner() 
+        {
+            return true; // Your mutex? It's OUR mutex, comrade!
+        };
+
+        void acquire(uint32_t timeout /* = STA_MUTEX_MAX_TIMEOUT */) override {}
         void release() override {}
     };
 
     static DummyMutex dummyMutex;
 
-
     Mutex * Mutex::ALWAYS_FREE = &dummyMutex;
 } // namespace sta