1 files changed, 25 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/thread/pthread_rwlock_timedrdlock.c b/libc-top-half/musl/src/thread/pthread_rwlock_timedrdlock.c
new file mode 100644
index 0000000..8cdd8ec
--- /dev/null
+++ b/libc-top-half/musl/src/thread/pthread_rwlock_timedrdlock.c
@@ -0,0 +1,25 @@
+#include "pthread_impl.h"
+
+int __pthread_rwlock_timedrdlock(pthread_rwlock_t *restrict rw, const struct timespec *restrict at)
+{
+	int r, t;
+
+	r = pthread_rwlock_tryrdlock(rw);
+	if (r != EBUSY) return r;
+	
+	int spins = 100;
+	while (spins-- && rw->_rw_lock && !rw->_rw_waiters) a_spin();
+
+	while ((r=__pthread_rwlock_tryrdlock(rw))==EBUSY) {
+		if (!(r=rw->_rw_lock) || (r&0x7fffffff)!=0x7fffffff) continue;
+		t = r | 0x80000000;
+		a_inc(&rw->_rw_waiters);
+		a_cas(&rw->_rw_lock, r, t);
+		r = __timedwait(&rw->_rw_lock, t, CLOCK_REALTIME, at, rw->_rw_shared^128);
+		a_dec(&rw->_rw_waiters);
+		if (r && r != EINTR) return r;
+	}
+	return r;
+}
+
+weak_alias(__pthread_rwlock_timedrdlock, pthread_rwlock_timedrdlock);