summaryrefslogtreecommitdiff
path: root/src/thread/sem_timedwait.c
diff options
context:
space:
mode:
authorRich Felker <dalias@aerifal.cx>2011-03-04 00:45:59 -0500
committerRich Felker <dalias@aerifal.cx>2011-03-04 00:45:59 -0500
commit6fc5fdbdc70dd17ea8e681a361fb4dae541ee953 (patch)
treeeee28ceddc2de85e528e50340e045a875e6a8e60 /src/thread/sem_timedwait.c
parent03dcc3417ce4388a652bdd053cb2b6af860daf00 (diff)
downloadmusl-6fc5fdbdc70dd17ea8e681a361fb4dae541ee953.tar.gz
implement POSIX semaphores
Diffstat (limited to 'src/thread/sem_timedwait.c')
-rw-r--r--src/thread/sem_timedwait.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/src/thread/sem_timedwait.c b/src/thread/sem_timedwait.c
new file mode 100644
index 00000000..e6604364
--- /dev/null
+++ b/src/thread/sem_timedwait.c
@@ -0,0 +1,18 @@
+#include <semaphore.h>
+#include "pthread_impl.h"
+
+int sem_timedwait(sem_t *sem, const struct timespec *at)
+{
+ int val;
+
+ for (;;) {
+ if (a_fetch_add(sem->__val, -1) > 0) return 0;
+ val = a_fetch_add(sem->__val, 1);
+ CANCELPT_BEGIN;
+ if (val <= 0 && __timedwait(sem->__val, val, CLOCK_REALTIME, at, 0) == ETIMEDOUT) {
+ errno = ETIMEDOUT;
+ return -1;
+ }
+ CANCELPT_END;
+ }
+}