1 files changed, 46 insertions, 0 deletions
diff --git a/libcult/cult/mm/arch/i386/counter.ixx b/libcult/cult/mm/arch/i386/counter.ixx
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+++ b/libcult/cult/mm/arch/i386/counter.ixx
@@ -0,0 +1,46 @@
+// file      : cult/mm/arch/i386/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; incl %0"
+                    :"=m" (value_)
+                    :"m" (value_));
+    }
+
+    inline
+    Boolean Counter::
+    dec_ref ()
+    {
+      register unsigned char r;
+
+      asm volatile("lock; decl %0; setz %1"
+                   :"=m" (value_), "=rm" (r)
+                   :"m" (value_));
+
+      return r != 0;
+    }
+
+    inline
+    Size Counter::
+    count () const
+    {
+      return value_;
+    }
+  }
+}