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[Minios-devel] [UNIKRAFT PATCH 1/2] lib/uklock: Use timeout equal to 0 for trying down a semaphore
- To: minios-devel@xxxxxxxxxxxxx
- From: Costin Lupu <costin.lupu@xxxxxxxxx>
- Date: Mon, 11 Mar 2019 18:28:41 +0200
- Cc: Florian.Schmidt@xxxxxxxxx, simon.kuenzer@xxxxxxxxx, yuri.volchkov@xxxxxxxxx, sharan.santhanam@xxxxxxxxx
- Delivery-date: Mon, 11 Mar 2019 16:28:56 +0000
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- List-id: Mini-os development list <minios-devel.lists.xenproject.org>
Until now, timeout equal to 0 meant waiting until the semaphore counter
would have got greater than zero, potentially forever. We allow now timeout
equal to 0 to be used when the user wants just to try down the semaphore
and return immediately, in order to be compliant with the behavior of the
sem_timedwait() POSIX function.
Signed-off-by: Costin Lupu <costin.lupu@xxxxxxxxx>
---
lib/uklock/include/uk/semaphore.h | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/lib/uklock/include/uk/semaphore.h
b/lib/uklock/include/uk/semaphore.h
index dea9a720..2513d441 100644
--- a/lib/uklock/include/uk/semaphore.h
+++ b/lib/uklock/include/uk/semaphore.h
@@ -97,10 +97,7 @@ static inline __nsec uk_semaphore_down_to(struct
uk_semaphore *s,
UK_ASSERT(s);
- if (timeout == 0)
- deadline = 0;
- else
- deadline = then + timeout;
+ deadline = then + timeout;
for (;;) {
uk_waitq_wait_event_deadline(&s->wait, s->count > 0, deadline);
--
2.11.0
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