2006/12/20, Martin Blapp <[EMAIL PROTECTED]>:
Hi,
> Since proctree_lock is a sx lock which uses 2 condition variables,
> they alredy drop Giant (DROP_GIANT()) before sleeping. Are you secure
> it is the right thing to do here?
Yes I am.
sx_slock() can call cv_wait() which later can call cv_wait_unlock ...
if there is already a lock we need to share ... After a possible
sleep cv_wait_unlock looks like:
cv_wait_unlock(struct cv *cvp, struct mtx *mp)
[...]
sleepq_lock(cvp);
cvp->cv_waiters++;
DROP_GIANT();
mtx_unlock(mp);
[...]
It can call DROP_GIANT for a short amount of time. This was the race.
No, it drops Giant for all the time it sleeps.
Maybe the race is somewhere else.
Attilio
--
Peace can only be achieved by understanding - A. Einstein
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