How to add a callback that can be called whenever the event loop calls an event handler?

From: Gang Chen <gang chen cn gmail com>
To: gtk-list <gtk-list gnome org>
Subject: How to add a callback that can be called whenever the event loop calls an event handler?
Date: Tue, 22 Jul 2014 18:06:47 +0800

Hi,

The callback does something common to every event handler. The callback should be called after any event handler is called. How to accomplish this?

Thanks,

Gang

Follow-Ups:
- Re: How to add a callback that can be called whenever the event loop calls an event handler?
  - From: Jasper St. Pierre