From 8286ac511144e4f17d34eac9affb97e50646344a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= <debian@jff-webhosting.net>
Date: Wed, 23 Jul 2014 15:25:44 +0200
Subject: Imported Upstream version 4.0.0

---
 .../smart_ptr/detail/sp_counted_base_cw_ppc.hpp    | 171 +++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 libcutl/cutl/details/boost/smart_ptr/detail/sp_counted_base_cw_ppc.hpp

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

diff --git a/libcutl/cutl/details/boost/smart_ptr/detail/sp_counted_base_cw_ppc.hpp b/libcutl/cutl/details/boost/smart_ptr/detail/sp_counted_base_cw_ppc.hpp
new file mode 100644
index 0000000..4500914
--- /dev/null
+++ b/libcutl/cutl/details/boost/smart_ptr/detail/sp_counted_base_cw_ppc.hpp
@@ -0,0 +1,171 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_CW_PPC_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_CW_PPC_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  detail/sp_counted_base_cw_ppc.hpp - CodeWarrior on PowerPC
+//
+//  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/sp_typeinfo.hpp>
+
+namespace cutl_details_boost
+{
+
+namespace detail
+{
+
+inline void atomic_increment( register long * pw )
+{
+    register int a;
+
+    asm
+    {
+loop:
+
+    lwarx   a, 0, pw
+    addi    a, a, 1
+    stwcx.  a, 0, pw
+    bne-    loop
+    }
+}
+
+inline long atomic_decrement( register long * pw )
+{
+    register int a;
+
+    asm
+    {
+    sync
+
+loop:
+
+    lwarx   a, 0, pw
+    addi    a, a, -1
+    stwcx.  a, 0, pw
+    bne-    loop
+
+    isync
+    }
+
+    return a;
+}
+
+inline long atomic_conditional_increment( register long * pw )
+{
+    register int a;
+
+    asm
+    {
+loop:
+
+    lwarx   a, 0, pw
+    cmpwi   a, 0
+    beq     store
+
+    addi    a, a, 1
+
+store:
+
+    stwcx.  a, 0, pw
+    bne-    loop
+    }
+
+    return a;
+}
+
+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;
+    virtual void * get_untyped_deleter() = 0;
+
+    void add_ref_copy()
+    {
+        atomic_increment( &use_count_ );
+    }
+
+    bool add_ref_lock() // true on success
+    {
+        return atomic_conditional_increment( &use_count_ ) != 0;
+    }
+
+    void release() // nothrow
+    {
+        if( atomic_decrement( &use_count_ ) == 0 )
+        {
+            dispose();
+            weak_release();
+        }
+    }
+
+    void weak_add_ref() // nothrow
+    {
+        atomic_increment( &weak_count_ );
+    }
+
+    void weak_release() // nothrow
+    {
+        if( atomic_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_CW_PPC_HPP_INCLUDED
-- 
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