1 files changed, 45 insertions, 0 deletions
diff --git a/libcult/cult/mm/arch/generic/counter.hxx b/libcult/cult/mm/arch/generic/counter.hxx
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+++ b/libcult/cult/mm/arch/generic/counter.hxx
@@ -0,0 +1,45 @@
+// file      : cult/mm/arch/generic/counter.hxx
+// author    : Boris Kolpackov <boris@kolpackov.net>
+// copyright : Copyright (c) 2005-2010 Boris Kolpackov
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+#ifndef CULT_MM_ARCH_GENERIC_COUNTER_HXX
+#define CULT_MM_ARCH_GENERIC_COUNTER_HXX
+
+#include <cult/types/fundamental.hxx>
+#include <cult/sched/spin.hxx>
+
+namespace Cult
+{
+  namespace MM
+  {
+    class Counter: public NonCopyable
+    {
+    public:
+      Counter ();
+
+      // After failure assume the counter has its old value.
+      //
+      Void
+      inc_ref ();
+
+
+      // After failure assume the counter has its new value.
+      //
+      Boolean
+      dec_ref ();
+
+
+      Size
+      count () const;
+
+    private:
+      Size value_;
+      mutable Sched::Spin spin_;
+    };
+  }
+}
+
+#include <cult/mm/arch/generic/counter.ixx>
+
+#endif  // CULT_MM_ARCH_GENERIC_COUNTER_HXX