From: pdimov_at_[hidden]
Date: 2008-04-09 15:58:55
Author: pdimov
Date: 2008-04-09 15:58:54 EDT (Wed, 09 Apr 2008)
New Revision: 44137
URL: http://svn.boost.org/trac/boost/changeset/44137
Log:
sp_counted_base_spin.hpp added, enabled by BOOST_SP_USE_SPINLOCK.
Added:
trunk/boost/detail/sp_counted_base_spin.hpp (contents, props changed)
Text files modified:
trunk/boost/detail/sp_counted_base.hpp | 4 ++++
trunk/boost/detail/spinlock_pool.hpp | 4 ++--
2 files changed, 6 insertions(+), 2 deletions(-)
Modified: trunk/boost/detail/sp_counted_base.hpp
==============================================================================
--- trunk/boost/detail/sp_counted_base.hpp (original)
+++ trunk/boost/detail/sp_counted_base.hpp 2008-04-09 15:58:54 EDT (Wed, 09 Apr 2008)
@@ -23,6 +23,10 @@
# include <boost/detail/sp_counted_base_nt.hpp>
+#elif defined( BOOST_SP_USE_SPINLOCK )
+
+# include <boost/detail/sp_counted_base_spin.hpp>
+
#elif defined( BOOST_SP_USE_PTHREADS )
# include <boost/detail/sp_counted_base_pt.hpp>
Added: trunk/boost/detail/sp_counted_base_spin.hpp
==============================================================================
--- (empty file)
+++ trunk/boost/detail/sp_counted_base_spin.hpp 2008-04-09 15:58:54 EDT (Wed, 09 Apr 2008)
@@ -0,0 +1,131 @@
+#ifndef BOOST_DETAIL_SP_COUNTED_BASE_SPIN_HPP_INCLUDED
+#define BOOST_DETAIL_SP_COUNTED_BASE_SPIN_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+// detail/sp_counted_base_spin.hpp - spinlock pool atomic emulation
+//
+// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
+// Copyright 2004-2008 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 <boost/detail/spinlock_pool.hpp>
+
+namespace boost
+{
+
+namespace detail
+{
+
+inline int atomic_exchange_and_add( int * pw, int dv )
+{
+ spinlock_pool<1>::scoped_lock lock( pw );
+
+ int r = *pw;
+ *pw += dv;
+ return r;
+}
+
+inline void atomic_increment( int * pw )
+{
+ spinlock_pool<1>::scoped_lock lock( pw );
+ ++*pw;
+}
+
+inline int atomic_conditional_increment( int * pw )
+{
+ spinlock_pool<1>::scoped_lock lock( pw );
+
+ int rv = *pw;
+ if( rv != 0 ) ++*pw;
+ return rv;
+}
+
+class sp_counted_base
+{
+private:
+
+ sp_counted_base( sp_counted_base const & );
+ sp_counted_base & operator= ( sp_counted_base const & );
+
+ int use_count_; // #shared
+ int 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()
+ {
+ atomic_increment( &use_count_ );
+ }
+
+ bool add_ref_lock() // true on success
+ {
+ return atomic_conditional_increment( &use_count_ ) != 0;
+ }
+
+ void release() // nothrow
+ {
+ if( atomic_exchange_and_add( &use_count_, -1 ) == 1 )
+ {
+ dispose();
+ weak_release();
+ }
+ }
+
+ void weak_add_ref() // nothrow
+ {
+ atomic_increment( &weak_count_ );
+ }
+
+ void weak_release() // nothrow
+ {
+ if( atomic_exchange_and_add( &weak_count_, -1 ) == 1 )
+ {
+ destroy();
+ }
+ }
+
+ long use_count() const // nothrow
+ {
+ spinlock_pool<1>::scoped_lock lock( &use_count_ );
+ return use_count_;
+ }
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif // #ifndef BOOST_DETAIL_SP_COUNTED_BASE_SPIN_HPP_INCLUDED
Modified: trunk/boost/detail/spinlock_pool.hpp
==============================================================================
--- trunk/boost/detail/spinlock_pool.hpp (original)
+++ trunk/boost/detail/spinlock_pool.hpp 2008-04-09 15:58:54 EDT (Wed, 09 Apr 2008)
@@ -37,7 +37,7 @@
public:
- static spinlock & spinlock_for( void * pv )
+ static spinlock & spinlock_for( void const * pv )
{
size_t i = reinterpret_cast< size_t >( pv ) % 41;
return pool_[ i ];
@@ -54,7 +54,7 @@
public:
- explicit scoped_lock( void * pv ): sp_( spinlock_for( pv ) )
+ explicit scoped_lock( void const * pv ): sp_( spinlock_for( pv ) )
{
sp_.lock();
}