Destroying an object that uses GCancellable

[Nader Morshed <morshed nader gmail com>]

Hi, I'm having some difficulties with figuring out how to properly structure an object of mine; the object 
takes in a GSocketConnection and generates in/output streams and starts a read_line loop. However, when I go 
to destroy the object, calling g_cancellable_cancel within either the finalize or dispose functions causes 
the read cycle to incorrectly fail. This is because of an initial g_return_if_fail assertion at the beginning 
of the read cycle's asynchronous callback as the object has been freed and the user_data pointer is no longer 
valid.

Here's the relavent section of code for this issue, sorry if it's not too clean right now:
http://pastebin.com/Yt6RX5qQ

I saw that gfilenamecompleter.c in the gio source folder uses a separate structure containing the 
GCancellable as well as the object, and I suppose one could always do manual cycle through the main loop 
through checking for and dispatching events within the finalize function in order to have the read's _async 
part complete, but both seem like sub-optimal solutions, so I was wondering if anyone on the list could lend 
their input on this matter.

-- 
Nader Morshed <morshed nader gmail com>