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Fix chopstx_poll for condition variables, check after woken up.

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Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka
2019-12-27 09:18:11 +09:00
parent 63f47cede3
commit 9253777f5f
1 changed files with 19 additions and 1 deletions
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20
chopstx.c
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@@ -1393,7 +1393,11 @@ chx_proxy_init (struct chx_px *px, uint32_t *cp)
* should be one of:
* chopstx_poll_cond_t, chopstx_poll_join_t, or chopstx_intr_t.
*
* Returns number of active descriptors.
* Returns number of active descriptors. Don't assume no active
* descriptors means timeout. It is possible for chopstx_poll to
* return zero (but not because of timeout), when it's woken up but
* found no condition matches. Application should call chopstx_poll
* again in this situation.
*/
int
chopstx_poll (uint32_t *usec_p, int n, struct chx_poll_head *const pd_array[])
@@ -1473,6 +1477,20 @@ chopstx_poll (uint32_t *usec_p, int n, struct chx_poll_head *const pd_array[])
ll_dequeue ((struct chx_pq *)&px[i]);
chx_spin_unlock (&pc->cond->lock);
}
else
{ /* Check the condition again after woken up. */
if (pc->mutex)
chopstx_mutex_lock (pc->mutex);
if ((*pc->check) (pc->arg) == 0)
{ /* Condition doesn't met. */
pc->ready = 0;
counter--;
}
if (pc->mutex)
chopstx_mutex_unlock (pc->mutex);
}
}
else if (pd->type == CHOPSTX_POLL_INTR)
{