1 files changed, 2 insertions, 0 deletions
diff --git a/include/llvm/PassRegistry.h b/include/llvm/PassRegistry.h
index 31d48a4..8b7f036 100644
--- a/include/llvm/PassRegistry.h
+++ b/include/llvm/PassRegistry.h
@@ -18,6 +18,7 @@
 #define LLVM_PASSREGISTRY_H
 
 #include "llvm/ADT/StringRef.h"
+#include "llvm/System/Mutex.h"
 
 namespace llvm {
 
@@ -32,6 +33,7 @@ struct PassRegistrationListener;
 /// each thread.
 class PassRegistry {
   mutable void *pImpl;
+  mutable sys::SmartMutex<true> Lock;
   void *getImpl() const;
    
 public: