[LTP] Test library API changes

[Cyril Hrubis <chrubis@suse.cz>]

Hi!
> That it will only cause signal to be delivered to that thread,
> but handler will still kill entire process.

Ah, right. I tend to forget that part.

> We could use different signal and define a signal handler,
> that would just loop, but that still doesn't guarantee
> when pending signal is delivered. Also threads could mask
> the signal.

We can call a pause() in a loop from the signal handler and check that
the thread is sleeping in the kernel from the main thread. But this is
getting too complicated.

> Then I was thinking about blocking threads using affinity,
> but if test changed priority we could lock ourselves out.
> 
> We do say in style guide, that cleanup can be called at any
> time. Should we leave it up to test author? We had the same
> problem with oldlib, right?

Yes, and technically we have the same problem with the forked processes
as well. When the main process calls tst_brk() the child processes may
still be running. But killing/waiting children in tst_brk() could be
done quite easily.

-- 
Cyril Hrubis
chrubis@suse.cz