1 files changed, 30 insertions, 0 deletions
diff --git a/tools/perf/util/rwsem.h b/tools/perf/util/rwsem.h
new file mode 100644
index 000000000000..b102d8143181
--- /dev/null
+++ b/tools/perf/util/rwsem.h
@@ -0,0 +1,30 @@
+#ifndef _PERF_RWSEM_H
+#define _PERF_RWSEM_H
+
+#include <pthread.h>
+#include "mutex.h"
+
+/*
+ * Mutexes have additional error checking. Enable to use a mutex rather than a
+ * rwlock for debugging.
+ */
+#define RWS_ERRORCHECK 0
+
+struct LOCKABLE rw_semaphore {
+#if RWS_ERRORCHECK
+	struct mutex mtx;
+#else
+	pthread_rwlock_t lock;
+#endif
+};
+
+int init_rwsem(struct rw_semaphore *sem);
+int exit_rwsem(struct rw_semaphore *sem);
+
+int down_read(struct rw_semaphore *sem) SHARED_LOCK_FUNCTION(sem);
+int up_read(struct rw_semaphore *sem) UNLOCK_FUNCTION(sem);
+
+int down_write(struct rw_semaphore *sem) EXCLUSIVE_LOCK_FUNCTION(sem);
+int up_write(struct rw_semaphore *sem) UNLOCK_FUNCTION(sem);
+
+#endif /* _PERF_RWSEM_H */