Multi-threading

[Bob Caryl <bob fis-cal com>]

Greetings everyone:

Here I am with another of my stupid questions:  I am currently working 
on an application whose purpose is to demonstrate an ability to 
communicate with the credit card processing servers operated by British 
Petroluem (BP) in this country.  One of the things I must do is "listen" 
for "device requests" issued by their EPS device.  All these 
communications are done via TCP/IP over a local lan.

Since these device requests can arrive on a particular port at any time, 
I have set up a pthread type thread to establish a listening socket on 
that port.  When this thread's call to accept() returns a good socket I 
spawn another thread that is a one shot affair to receive the actual 
request and deal with it.  It is in this second thread that I am running 
into trouble.

What I want to do (for now) is take the actual message arriving from the 
BP EPS and display it in a Gtk::TextView by inserting it into the 
Gtk::TextBuffer associated with the view.  So, I have made the function 
used to spawn the second thread a friend of my window class and I make 
the call to Gtk::TextBuffer::insert in that second thread.  Here is 
where the problems arise.  If I do a standard "wait for the main loop" 
device e.g.

while(Gtk::Main::events_pending())
   Gtk::Main::iteration();

I get the following stderr output:

GLib-ERROR **: file gmain.c: line 1898 (g_main_dispatch): assertion 
failed: (source) aborting...
Terminated with signal 6 (Aborted)

Can anyone give me a hint as to my error(s) here?  I am calling the 
Gtk::Main methods from a thread twice removed from the one that actually 
started that instance of Gtk::Main...  Perhaps should I use 
Glib::ThreadPool rather than pthreads?

All comments will be greatly appreciated,

Bob Caryl

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