Added wxYieldIfNeeded

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9410 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/utils.h

@@ -302,6 +302,9 @@ WXDLLEXPORT wxWindow* wxFindWindowAtPoint(const wxPoint& pt);
 // Yield to other apps/messages
 WXDLLEXPORT bool wxYield();
 
+// Like wxYield, but fails silently if the yield is recursive.
+WXDLLEXPORT bool wxYieldIfNeeded();
+
 // Yield to other apps/messages and disable user input
 WXDLLEXPORT bool wxSafeYield(wxWindow *win = NULL);