1 files changed, 28 insertions, 0 deletions
diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
new file mode 100644
index 00000000..9d70e6e2
--- /dev/null
+++ b/include/linux/rwsem.h
@@ -0,0 +1,28 @@
+#ifndef __TOOLS_LINUX_RWSEM_H
+#define __TOOLS_LINUX_RWSEM_H
+
+#include <pthread.h>
+
+struct rw_semaphore {
+	pthread_rwlock_t	lock;
+};
+
+#define __RWSEM_INITIALIZER(name)				\
+	{ .lock = PTHREAD_RWLOCK_INITIALIZER }
+
+#define DECLARE_RWSEM(name) \
+	struct rw_semaphore name = __RWSEM_INITIALIZER(name)
+
+static inline void init_rwsem(struct rw_semaphore *lock)
+{
+	pthread_rwlock_init(&lock->lock, NULL);
+}
+
+#define down_read(l)		pthread_rwlock_rdlock(&(l)->lock)
+#define down_read_trylock(l)	(!pthread_rwlock_tryrdlock(&(l)->lock))
+#define up_read(l)		pthread_rwlock_unlock(&(l)->lock)
+
+#define down_write(l)		pthread_rwlock_wrlock(&(l)->lock)
+#define up_write(l)		pthread_rwlock_unlock(&(l)->lock)
+
+#endif /* __TOOLS_LINUX_RWSEM_H */