Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdepim@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 160 insertions, 0 deletions

diff --git a/indexlib/mempool.h b/indexlib/mempool.h
new file mode 100644
index 000000000..e0cfc9a3a
--- /dev/null
+++ b/indexlib/mempool.h
@@ -0,0 +1,160 @@
+#ifndef LPC_MEMPOOL_H1103129409_INCLUDE_GUARD_
+#define LPC_MEMPOOL_H1103129409_INCLUDE_GUARD_
+
+/* This file is part of indexlib.
+ * Copyright (C) 2005 Luís Pedro Coelho <luis@luispedro.org>
+ *
+ * Indexlib is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation and available as file
+ * GPL_V2 which is distributed along with indexlib.
+ * 
+ * Indexlib is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA
+ * 
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of this program with any edition of
+ * the Qt library by Trolltech AS, Norway (or with modified versions
+ * of Qt that use the same license as Qt), and distribute linked
+ * combinations including the two.  You must obey the GNU General
+ * Public License in all respects for all of the code used other than
+ * Qt.  If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.  If
+ * you do not wish to do so, delete this exception statement from
+ * your version.
+ */
+
+
+#include "memreference.h"
+#include "manager.h"
+#include "memreference.h"
+#include "thing.h"
+#include <cassert>
+#include <vector>
+#include <memory>
+#include <algorithm>
+#include <iostream>
+
+/**
+ * @short implement memory management for things
+ *
+ * This class implements memory management for pools of things.
+ * It uses a simple linked list memory management algorithm and
+ * it depends on being supplied the right trait for the type held.
+ */
+template <typename Traits>
+struct mempool /* : boost::noncopyable */ {
+	public:
+		typedef Traits traits_type;
+		typedef typename traits_type::value_type data_type;
+		typedef typename traits_type::pointer data_typeptr;
+		explicit mempool( std::auto_ptr<memory_manager> source );
+
+		/**
+		 * Returns a memory block of size \param s.
+		 * Analogous to malloc()
+		 */
+		data_typeptr allocate( unsigned s );
+		/**
+		 * Makes the memory pointed to by \param p of size \s or allocates a new block of size \s
+		 * and moves the held data.
+		 *
+		 * Analogous to realloc()
+		 * Unlike realloc(), does not support either reallocate( 0, s ) nor reallocate( p, 0 )
+		 */
+		data_typeptr reallocate( data_typeptr, unsigned );
+		/** Releases the memory pointed to by \param p
+		  * Analogous to free()
+		  */
+		void deallocate( data_typeptr p );
+
+		/** Prints a half-readable description to \param out
+		 * Mainly for debugging 
+		 */
+		void print( std::ostream& out ) const;
+
+		/**
+		 * How big (in bytes) is the memory managed?
+		 */
+		unsigned size() const { return manager_->size(); }
+	private:
+		/**
+		 * Basically int( log_2( min( x + 1, min_size() ) ) )
+		 */
+		static unsigned order_of( unsigned x ) {
+			assert( x > 0 );
+			if ( x < traits_type::min_size() ) x = traits_type::min_size();
+			--x;
+			unsigned res = 0;
+			while ( x ) {
+				++res;
+				x >>= 1;
+			}
+			return res;
+		}
+		/**
+		 * @returns order^2
+		 */
+		static unsigned order_to_size( unsigned order ) {
+			return 1 << order;
+		}
+		static unsigned size_of( data_typeptr data ) {
+			return traits_type::size_of( data );
+		}
+
+		enum { min_order_for_free_node = 4 };
+		
+		friend struct list_node_manager;
+		struct list_node_manager {
+			protected:
+				const mempool* parent_;
+			public:
+				explicit list_node_manager( const mempool* p = 0 ):parent_( p ) {}
+
+				void* rw_base( unsigned idx ) const {
+					return parent_->manager_->rw_base( idx );
+				}
+				const void* ronly_base( unsigned idx ) const {
+					return parent_->manager_->ronly_base( idx );
+				}
+		};
+
+		START_THING( list_node, thing<list_node_manager> )
+			void set_parent( const mempool* p ) { this->parent_ = p; }
+			MEMBER( uint16_t, order, 0 )
+			MEMBER( uint32_t, next, 2 )
+			MEMBER( uint32_t, prev, 6 )
+		END_THING( list_node )
+
+		list_nodeptr get_node( uint32_t p ) const;
+		/**
+		 * Get the free list header for a given order
+		 */
+		memory_reference<uint32_t> free_list( unsigned order );
+		uint32_t free_list( unsigned order ) const {
+			return const_cast<mempool*>( this )->free_list( order );
+		}
+		void insert_into_list( uint32_t where, unsigned order );
+		void remove_from_list( uint32_t where, unsigned order );
+		void break_up( uint32_t where );
+		void init_memory();
+		void fill_into_list( unsigned old_size );
+		void fill_into_list( unsigned old_size, unsigned order );
+
+		bool join( data_typeptr&, unsigned order );
+		void deallocate( data_typeptr, unsigned order );
+
+		std::auto_ptr<memory_manager> manager_;
+		memory_reference<uint32_t> max_order_;
+};
+
+#include "mempool.tcc"
+
+#endif /* LPC_MEMPOOL_H1103129409_INCLUDE_GUARD_ */