Implemented Oliver's suggested improvement to ServerCursorReference when

switching cursors. There was a race condition in case the objects was used
by multiple threads, in which Cursor() could return an already destroyed
object. Note: This doesn't fix a real bug or anything, the change is purely
forward looking in case ServerCursorReference is ever used like that.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24862 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/app/ServerCursor.h

@@ -105,11 +105,12 @@ public:
 							{
 								if (fCursor == cursor)
 									return;
-								if (fCursor)
+								if (cursor)
-									fCursor->Release();
+									cursor->Acquire();
+								ServerCursor* oldCursor = fCursor;
 								fCursor = cursor;
-								if (fCursor)
+								if (oldCursor)
-									fCursor->Acquire();
+									oldCursor->Release();
 							}
 	ServerCursor*			Cursor() const
 							{