What causes GLib I/O Channels operations to use up 100% CPU in GTK+ app.?

[Daniel Yek <dyek real com>]

Hi,

I am attaching the source code of a small test program here.

Could somebody enlighten me why after an I/O Channel operation 
(g_io_channel_shutdown() here), the GTK+ program started to use up 100% CPU?

Is it monitoring something? Do I need to undo g_io_add_watch() somehow? 
What operation is needed to not get into such situation?

Thanks.


--
Daniel Yek