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_sync.hpp      | 156 +++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 libcutl/cutl/details/boost/smart_ptr/detail/sp_counted_base_sync.hpp

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

diff --git a/libcutl/cutl/details/boost/smart_ptr/detail/sp_counted_base_sync.hpp b/libcutl/cutl/details/boost/smart_ptr/detail/sp_counted_base_sync.hpp
new file mode 100644
index 0000000..b1a0b35
--- /dev/null
+++ b/libcutl/cutl/details/boost/smart_ptr/detail/sp_counted_base_sync.hpp
@@ -0,0 +1,156 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SYNC_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SYNC_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//  detail/sp_counted_base_sync.hpp - g++ 4.1+ __sync intrinsics
+//
+//  Copyright (c) 2007 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
+
+#include <cutl/details/boost/detail/sp_typeinfo.hpp>
+#include <limits.h>
+
+#if defined( __ia64__ ) && defined( __INTEL_COMPILER )
+# include <ia64intrin.h>
+#endif
+
+namespace cutl_details_boost
+{
+
+namespace detail
+{
+
+#if INT_MAX >= 2147483647
+
+typedef int sp_int32_t;
+
+#else
+
+typedef long sp_int32_t;
+
+#endif
+
+inline void atomic_increment( sp_int32_t * pw )
+{
+    __sync_fetch_and_add( pw, 1 );
+}
+
+inline sp_int32_t atomic_decrement( sp_int32_t * pw )
+{
+    return __sync_fetch_and_add( pw, -1 );
+}
+
+inline sp_int32_t atomic_conditional_increment( sp_int32_t * pw )
+{
+    // long r = *pw;
+    // if( r != 0 ) ++*pw;
+    // return r;
+
+    sp_int32_t r = *pw;
+
+    for( ;; )
+    {
+        if( r == 0 )
+        {
+            return r;
+        }
+
+        sp_int32_t r2 = __sync_val_compare_and_swap( pw, r, r + 1 );
+
+        if( r2 == r )
+        {
+            return r;
+        }
+        else
+        {
+            r = r2;
+        }
+    }    
+}
+
+class sp_counted_base
+{
+private:
+
+    sp_counted_base( sp_counted_base const & );
+    sp_counted_base & operator= ( sp_counted_base const & );
+
+    sp_int32_t use_count_;        // #shared
+    sp_int32_t 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_ ) == 1 )
+        {
+            dispose();
+            weak_release();
+        }
+    }
+
+    void weak_add_ref() // nothrow
+    {
+        atomic_increment( &weak_count_ );
+    }
+
+    void weak_release() // nothrow
+    {
+        if( atomic_decrement( &weak_count_ ) == 1 )
+        {
+            destroy();
+        }
+    }
+
+    long use_count() const // nothrow
+    {
+        return const_cast< sp_int32_t const volatile & >( use_count_ );
+    }
+};
+
+} // namespace detail
+
+} // namespace cutl_details_boost
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SYNC_HPP_INCLUDED
-- 
cgit v1.2.3