1 files changed, 53 insertions, 0 deletions
diff --git a/lldb/source/Utility/SharingPtr.cpp b/lldb/source/Utility/SharingPtr.cpp
new file mode 100644
index 00000000000..431fdc1b900
--- /dev/null
+++ b/lldb/source/Utility/SharingPtr.cpp
@@ -0,0 +1,53 @@
+//===---------------------SharingPtr.cpp ------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "SharingPtr.h"
+
+namespace lldb {
+
+namespace imp
+{
+
+template <class T>
+inline T
+increment(T& t)
+{
+    return __sync_add_and_fetch(&t, 1);
+}
+
+template <class T>
+inline T
+decrement(T& t)
+{
+    return __sync_add_and_fetch(&t, -1);
+}
+
+shared_count::~shared_count()
+{
+}
+
+void
+shared_count::add_shared()
+{
+    increment(shared_owners_);
+}
+
+void
+shared_count::release_shared()
+{
+    if (decrement(shared_owners_) == -1)
+    {
+        on_zero_shared();
+        delete this;
+    }
+}
+
+} // imp
+
+} // namespace lldb