Threading, real or simulated?

[Sam]

I'm using Python 2.3.5 with pygtk 2.4.1, and I'm using the second threading approach from pygtk's FAQ 20.6 - invoking "gtk.gdk.threads_init()", and wrapping all gtk/gdk function calls with gtk.threads_enter()/gtk.threads_leave()

I start a thread, via thread.Threading.start(). The thread then calls a particularly time consuming C function, from an extension module. I find that when the thread is running the C code, the GUI hangs even though I'm not inside the threads_enter/threads_leave territory. It looks like thread.Threading() only simulates threading, by having the python interpreter multiplex between running threads. Is real threading possible, so that I do something time-consuming in the thread, without hanging the GUI?

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