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Oh, nice!
> I was wondering if I should merge PyThread_acquire_lock_timed with my
> new PyThread_acquire_lock_timed_intr, since PyThread_acquire_lock_timed 
> wasn't available in 3.1.
Yes, I think you should.
I haven't tried the patch, but it seems you got the logic right. There's a problem sometimes that you're using 2 spaces for indent rather than 4. Also, you forgot to update the RLock implementation in _threadmodule.c (and perhaps add another test for it).
(there are other modules which use the PyThread_acquire_lock API, but most of the time the locks are held for a short time (and shouldn't deadlock), which makes converting them less of a priority)