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authorRich Felker <dalias@aerifal.cx>2011-03-07 18:09:24 -0500
committerRich Felker <dalias@aerifal.cx>2011-03-07 18:09:24 -0500
commit9fe28f703d44ff1ddecdca945bfb5fc87de5e8ad (patch)
tree43f46e8b5f847b6cad08efc308255559a4a2bc22 /src
parent5fd4a9816573a3b6a244b73b84ce0cec871321da (diff)
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fix off-by-one error in sem_(timed)wait (using old sem value instead of new)
Diffstat (limited to 'src')
-rw-r--r--src/thread/sem_timedwait.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/thread/sem_timedwait.c b/src/thread/sem_timedwait.c
index e6604364..e6c2495a 100644
--- a/src/thread/sem_timedwait.c
+++ b/src/thread/sem_timedwait.c
@@ -7,7 +7,7 @@ int sem_timedwait(sem_t *sem, const struct timespec *at)
 
 	for (;;) {
 		if (a_fetch_add(sem->__val, -1) > 0) return 0;
-		val = a_fetch_add(sem->__val, 1);
+		val = a_fetch_add(sem->__val, 1)+1;
 		CANCELPT_BEGIN;
 		if (val <= 0 && __timedwait(sem->__val, val, CLOCK_REALTIME, at, 0) == ETIMEDOUT) {
 			errno = ETIMEDOUT;