Added the parts of boost which we need to access shared_ptr and weak_ptr. This will allow for improved memory management of large volumes.

library/include/boost/detail/sp_counted_base_pt.hpp

@@ -0,0 +1,135 @@
+#ifndef BOOST_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED
+#define BOOST_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  detail/sp_counted_base_pt.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)
+//
+
+#include <boost/detail/sp_typeinfo.hpp>
+#include <pthread.h>
+
+namespace 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)
+
+    mutable pthread_mutex_t m_;
+
+public:
+
+    sp_counted_base(): use_count_( 1 ), weak_count_( 1 )
+    {
+// HPUX 10.20 / DCE has a nonstandard pthread_mutex_init
+
+#if defined(__hpux) && defined(_DECTHREADS_)
+        pthread_mutex_init( &m_, pthread_mutexattr_default );
+#else
+        pthread_mutex_init( &m_, 0 );
+#endif
+    }
+
+    virtual ~sp_counted_base() // nothrow
+    {
+        pthread_mutex_destroy( &m_ );
+    }
+
+    // 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()
+    {
+        pthread_mutex_lock( &m_ );
+        ++use_count_;
+        pthread_mutex_unlock( &m_ );
+    }
+
+    bool add_ref_lock() // true on success
+    {
+        pthread_mutex_lock( &m_ );
+        bool r = use_count_ == 0? false: ( ++use_count_, true );
+        pthread_mutex_unlock( &m_ );
+        return r;
+    }
+
+    void release() // nothrow
+    {
+        pthread_mutex_lock( &m_ );
+        long new_use_count = --use_count_;
+        pthread_mutex_unlock( &m_ );
+
+        if( new_use_count == 0 )
+        {
+            dispose();
+            weak_release();
+        }
+    }
+
+    void weak_add_ref() // nothrow
+    {
+        pthread_mutex_lock( &m_ );
+        ++weak_count_;
+        pthread_mutex_unlock( &m_ );
+    }
+
+    void weak_release() // nothrow
+    {
+        pthread_mutex_lock( &m_ );
+        long new_weak_count = --weak_count_;
+        pthread_mutex_unlock( &m_ );
+
+        if( new_weak_count == 0 )
+        {
+            destroy();
+        }
+    }
+
+    long use_count() const // nothrow
+    {
+        pthread_mutex_lock( &m_ );
+        long r = use_count_;
+        pthread_mutex_unlock( &m_ );
+
+        return r;
+    }
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED