Multhithreading internals in GTK+

[Vishwanath Venkatesan <venkates cs columbia edu>]

Hi,

I am trying to understand the  internals of threading in GTK+-2.0.  
From my understanding there are threads generated with GTK+ functions  
(ex. Opening a file-dialog) even without explicit  threading.

I was trying to instrument a GTK+ based applications like Gedit using  
instrumentation tools like PIN. I found that as the instrumentation  
overhead increased there were more threads generated. This was weird, as
one would expect, with the notion of threads as workers the number of  
threads needs to stay constant for the same input, whatever be the  
slowdown.

This probably could be because Gedit does something smart based on the  
overhead, which I would highly suspect and moreover I see this with  
other GTK based applications too. (or) There are threads generated for
additional events like additional mouse movements etc.

What do you think could be a reason?

Can someone explain?

Thanks
Vish