Create an abstract interface to be used to implement a SolarMutex

sal/inc/osl/mutex.hxx

@@ -247,6 +247,29 @@ namespace osl
     typedef Guard<Mutex> MutexGuard;
     typedef ClearableGuard<Mutex> ClearableMutexGuard;
     typedef ResettableGuard< Mutex > ResettableMutexGuard;
+
+    /** SolarMutex interface, needed for SolarMutex.
+        Deprecated, used just for Application::GetSolarMutex().
+    */
+    class SolarMutex
+    {
+        public:
+            /** Blocks if mutex is already in use
+            */
+            virtual void SAL_CALL acquire() = 0;
+
+            /** Tries to get the mutex without blocking.
+            */
+            virtual sal_Bool SAL_CALL tryToAcquire() = 0;
+
+            /** Releases the mutex.
+            */
+            virtual void SAL_CALL release() = 0;
+
+        protected:
+            SolarMutex() {}
+            virtual ~SolarMutex() {}
+    };
 }
 
 #endif  /* __cplusplus */