Add a portable strerror*() wrapper, llvm::sys::StrError(). This includes the

[oota-llvm.git] / include / llvm / Type.h

diff --git a/include/llvm/Type.h b/include/llvm/Type.h
index 256944f600498327567799eb58e7d703ae59e6f4..d439233d8c05d1d643c50de1a26259b5db8c9a09 100644 (file)
--- a/include/llvm/Type.h
+++ b/include/llvm/Type.h
@@ -14,6 +14,7 @@
 #include "llvm/AbstractTypeUser.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/DataTypes.h"
+#include "llvm/System/Atomic.h"
 #include "llvm/ADT/GraphTraits.h"
 #include "llvm/ADT/iterator.h"
 #include <string>
@@ -102,7 +103,7 @@ private:
   /// has no AbstractTypeUsers, the type is deleted.  This is only sensical for
   /// derived types.
   ///
-  mutable unsigned RefCount;
+  mutable sys::cas_flag RefCount;
 
   const Type *getForwardedTypeInternal() const;
 
@@ -337,7 +338,7 @@ public:
 
   void addRef() const {
     assert(isAbstract() && "Cannot add a reference to a non-abstract type!");
-    ++RefCount;
+    sys::AtomicIncrement(&RefCount);
   }
 
   void dropRef() const {
@@ -346,7 +347,8 @@ public:
 
     // If this is the last PATypeHolder using this object, and there are no
     // PATypeHandles using it, the type is dead, delete it now.
-    if (--RefCount == 0 && AbstractTypeUsers.empty())
+    sys::cas_flag OldCount = sys::AtomicDecrement(&RefCount);
+    if (OldCount == 0 && AbstractTypeUsers.empty())
       this->destroy();
   }