1 files changed, 11 insertions, 0 deletions
diff --git a/src/include/fst/lock.h b/src/include/fst/lock.h
index 3adf7df..329015d 100644
--- a/src/include/fst/lock.h
+++ b/src/include/fst/lock.h
@@ -16,6 +16,9 @@
 //
 // \file
 // Google-compatibility locking declarations and inline definitions
+//
+// Classes and functions here are no-ops (by design); proper locking requires
+// actual implementation.
 
 #ifndef FST_LIB_LOCK_H__
 #define FST_LIB_LOCK_H__
@@ -61,6 +64,14 @@ class MutexLock {
   DISALLOW_COPY_AND_ASSIGN(MutexLock);
 };
 
+class ReaderMutexLock {
+ public:
+  ReaderMutexLock(Mutex *) {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ReaderMutexLock);
+};
+
 // Reference counting - single-thread implementation
 class RefCounter {
  public: