From b51965dddbed68f23c5e8c169c23c794313ce5f6 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 28 Jun 2011 17:17:23 +0200
Subject: Add boost subset as an implementation detail

---
 .../boost/smart_ptr/detail/sp_counted_base_w32.hpp | 130 +++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 cutl/details/boost/smart_ptr/detail/sp_counted_base_w32.hpp

(limited to 'cutl/details/boost/smart_ptr/detail/sp_counted_base_w32.hpp')

diff --git a/cutl/details/boost/smart_ptr/detail/sp_counted_base_w32.hpp b/cutl/details/boost/smart_ptr/detail/sp_counted_base_w32.hpp
new file mode 100644
index 0000000..f69c68d
--- /dev/null
+++ b/cutl/details/boost/smart_ptr/detail/sp_counted_base_w32.hpp
@@ -0,0 +1,130 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_W32_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_W32_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  detail/sp_counted_base_w32.hpp
+//
+//  Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
+//  Copyright 2004-2005 Peter Dimov
+//
+//  Distributed under the Boost Software License, Version 1.0. (See
+//  accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+//
+//  Lock-free algorithm by Alexander Terekhov
+//
+//  Thanks to Ben Hitchings for the #weak + (#shared != 0)
+//  formulation
+//
+
+#include <cutl/details/boost/detail/interlocked.hpp>
+#include <cutl/details/boost/detail/workaround.hpp>
+#include <cutl/details/boost/detail/sp_typeinfo.hpp>
+
+namespace cutl_details_boost
+{
+
+namespace detail
+{
+
+class sp_counted_base
+{
+private:
+
+    sp_counted_base( sp_counted_base const & );
+    sp_counted_base & operator= ( sp_counted_base const & );
+
+    long use_count_;        // #shared
+    long weak_count_;       // #weak + (#shared != 0)
+
+public:
+
+    sp_counted_base(): use_count_( 1 ), weak_count_( 1 )
+    {
+    }
+
+    virtual ~sp_counted_base() // nothrow
+    {
+    }
+
+    // dispose() is called when use_count_ drops to zero, to release
+    // the resources managed by *this.
+
+    virtual void dispose() = 0; // nothrow
+
+    // destroy() is called when weak_count_ drops to zero.
+
+    virtual void destroy() // nothrow
+    {
+        delete this;
+    }
+
+    virtual void * get_deleter( sp_typeinfo const & ti ) = 0;
+
+    void add_ref_copy()
+    {
+        BOOST_INTERLOCKED_INCREMENT( &use_count_ );
+    }
+
+    bool add_ref_lock() // true on success
+    {
+        for( ;; )
+        {
+            long tmp = static_cast< long const volatile& >( use_count_ );
+            if( tmp == 0 ) return false;
+
+#if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, == 1200 )
+
+            // work around a code generation bug
+
+            long tmp2 = tmp + 1;
+            if( BOOST_INTERLOCKED_COMPARE_EXCHANGE( &use_count_, tmp2, tmp ) == tmp2 - 1 ) return true;
+
+#else
+
+            if( BOOST_INTERLOCKED_COMPARE_EXCHANGE( &use_count_, tmp + 1, tmp ) == tmp ) return true;
+
+#endif
+        }
+    }
+
+    void release() // nothrow
+    {
+        if( BOOST_INTERLOCKED_DECREMENT( &use_count_ ) == 0 )
+        {
+            dispose();
+            weak_release();
+        }
+    }
+
+    void weak_add_ref() // nothrow
+    {
+        BOOST_INTERLOCKED_INCREMENT( &weak_count_ );
+    }
+
+    void weak_release() // nothrow
+    {
+        if( BOOST_INTERLOCKED_DECREMENT( &weak_count_ ) == 0 )
+        {
+            destroy();
+        }
+    }
+
+    long use_count() const // nothrow
+    {
+        return static_cast<long const volatile &>( use_count_ );
+    }
+};
+
+} // namespace detail
+
+} // namespace cutl_details_boost
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_W32_HPP_INCLUDED
-- 
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