2 files changed, 89 insertions, 0 deletions
diff --git a/libcult/cult/mm/arch/i386/i486/i586/i686/x86_64/counter.hxx b/libcult/cult/mm/arch/i386/i486/i586/i686/x86_64/counter.hxx
new file mode 100644
index 0000000..5869b09
--- /dev/null
+++ b/libcult/cult/mm/arch/i386/i486/i586/i686/x86_64/counter.hxx
@@ -0,0 +1,43 @@
+// file      : cult/mm/arch/i386/i486/i586/i686/x86_64/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_I386_I486_I586_I686_X86_64_COUNTER_HXX
+#define CULT_MM_ARCH_I386_I486_I586_I686_X86_64_COUNTER_HXX
+
+#include <cult/types/fundamental.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_;
+    };
+  }
+}
+
+#include <cult/mm/arch/i386/i486/i586/i686/x86_64/counter.ixx>
+
+#endif  // CULT_MM_ARCH_I386_I486_I586_I686_X86_64_COUNTER_HXX
diff --git a/libcult/cult/mm/arch/i386/i486/i586/i686/x86_64/counter.ixx b/libcult/cult/mm/arch/i386/i486/i586/i686/x86_64/counter.ixx
new file mode 100644
index 0000000..9e9e7f4
--- /dev/null
+++ b/libcult/cult/mm/arch/i386/i486/i586/i686/x86_64/counter.ixx
@@ -0,0 +1,46 @@
+// file      : cult/mm/arch/i386/i486/i586/i686/x86_64/counter.ixx
+// author    : Boris Kolpackov <boris@kolpackov.net>
+// copyright : Copyright (c) 2005-2010 Boris Kolpackov
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+namespace Cult
+{
+  namespace MM
+  {
+    inline
+    Counter::
+    Counter ()
+        : value_ (1)
+    {
+    }
+
+    inline
+    Void Counter::
+    inc_ref ()
+    {
+      asm volatile ("lock; incq %0"
+                    :"=m" (value_)
+                    :"m" (value_));
+    }
+
+    inline
+    Boolean Counter::
+    dec_ref ()
+    {
+      register unsigned char r;
+
+      asm volatile("lock; decq %0; setz %1"
+                   :"=m" (value_), "=rm" (r)
+                   :"m" (value_));
+
+      return r != 0;
+    }
+
+    inline
+    Size Counter::
+    count () const
+    {
+      return value_;
+    }
+  }
+}