Added mutex functions to MorphOS interface

svn-id: r4407

morphos/morphos.cpp

@@ -277,6 +277,31 @@ void *OSystem_MorphOS::create_thread(ThreadProc *proc, void *param)
 	return ScummMusicThread;
 }
 
+void *OSystem_MorphOS::create_mutex(void)
+{
+	struct SignalSemaphore *sem = (struct SignalSemaphore *)AllocVec( sizeof( struct SignalSemaphore ), MEMF_PUBLIC );
+
+	if( sem )
+		InitSemaphore( sem );
+
+	return sem;
+}
+
+void OSystem_MorphOS::lock_mutex(void *mutex)
+{
+	ObtainSemaphore( (struct SignalSemaphore *)mutex );
+}
+
+void OSystem_MorphOS::unlock_mutex(void *mutex)
+{
+	ReleaseSemaphore( (struct SignalSemaphore *)mutex );
+}
+
+void OSystem_MorphOS::delete_mutex(void *mutex)
+{
+	FreeVec( mutex );
+}
+
 uint32 OSystem_MorphOS::property(int param, Property *value)
 {
 	switch( param )

morphos/morphos.h

@@ -67,6 +67,12 @@ class OSystem_MorphOS : public OSystem
 		// Add a new callback timer
 		virtual void set_timer(int timer, int (*callback)(int));
 
+		// Mutex handling
+		virtual void *create_mutex(void);
+		virtual void lock_mutex(void *mutex);
+		virtual void unlock_mutex(void *mutex);
+		virtual void delete_mutex(void *mutex);
+
 		// Create a thread
 		virtual void *create_thread(ThreadProc *proc, void *param);