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

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To: gtk-list <gtk-list@xxxxxxxxx>
Subject: How to add a callback that can be called whenever the event loop calls an event handler?
From: Gang Chen <gang.chen.cn@xxxxxxxxx>
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

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