Comment #4 on issue 9869 by [email protected]: _XGetXCBBuffer: Assertion  
`((int) ((xcb_req) - (dpy->request)) >= 0)' failed
http://code.google.com/p/chromium/issues/detail?id=9869

proxying to the UI thread is not an option.  keep in mind that the UI  
thread could be
blocked waiting for a child plugin window which could be blocked trying to  
script the
renderer.

this GetRootWindowRect call is handled on the IO thread to avoid that  
dead-lock
scenario, but it depends on being able to talk to the windowing system from  
more than
one thread.

i believe the solution for X is to use a mutex to protect all X access.   
doesn't GTK
(or GDK) have such a lock that we can acquire?

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