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path: root/src/thread/pthread_rwlock_tryrdlock.c
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Diffstat (limited to 'src/thread/pthread_rwlock_tryrdlock.c')
-rw-r--r--src/thread/pthread_rwlock_tryrdlock.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/src/thread/pthread_rwlock_tryrdlock.c b/src/thread/pthread_rwlock_tryrdlock.c
new file mode 100644
index 00000000..f59fbbdd
--- /dev/null
+++ b/src/thread/pthread_rwlock_tryrdlock.c
@@ -0,0 +1,13 @@
+#include "pthread_impl.h"
+
+int pthread_rwlock_tryrdlock(pthread_rwlock_t *rw)
+{
+ a_inc(&rw->__readers);
+ if (rw->__wrlock) {
+ a_dec(&rw->__readers);
+ if (rw->__waiters && !rw->__readers)
+ __wake(&rw->__readers, 1, 0);
+ return EAGAIN;
+ }
+ return 0;
+}