Re: PATCH: Race in 2.6.0-test2 timer code

From: Ingo Molnar (mingo@elte.hu)
Date: Wed Jul 30 2003 - 02:34:40 EST


On Wed, 30 Jul 2003, Andrea Arcangeli wrote:

> The thing triggered simply by running setitimer in one function, while
> the it_real_fn was running in the other cpu. I don't see how 2.6 can
> have fixed this, it_real_fun can still trivially call add_timer while
> you run inside do_setitimer in 2.6 too. [...]

This is not a race that can happen. itimer does this:

        del_timer_sync();
        add_timer();

how can the add_timer() still happen while it_real_fn is still running on
another CPU?

        Ingo

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