RefConvert.hpp

/*
   Copyright (C) 2003, 2005, 2006, 2008 MySQL AB, 2008, 2009 Sun Microsystems, Inc.
    All rights reserved. Use is subject to license terms.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program 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 St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#ifndef REFCONVERT_H
#define REFCONVERT_H

#include <assert.h>
#include "kernel_types.h"
#include "ndb_limits.h"

/*
 * In multithreaded kernel, BlockNumber includes the main block
 * number in lower 9 bits and the instance in upper 7 bits.
 */

inline
BlockNumber blockToMain(Uint32 block){
  assert(block < (1 << 16));
  return (BlockNumber)(block & ((1 << NDBMT_BLOCK_BITS) - 1));
}

inline
BlockInstance blockToInstance(Uint32 block){
  assert(block < (1 << 16));
  return (BlockNumber)(block >> NDBMT_BLOCK_BITS);
}

inline
BlockNumber numberToBlock(Uint32 main, Uint32 instance)
{
  assert(main < (1 << NDBMT_BLOCK_BITS) && 
         instance < (1 << NDBMT_BLOCK_INSTANCE_BITS));
  return (BlockNumber)(main | (instance << NDBMT_BLOCK_BITS));
}

inline
NodeId refToNode(Uint32 ref){
  return (NodeId)(ref & ((1 << 16) - 1));
}

inline
BlockNumber refToBlock(Uint32 ref){
  return (BlockNumber)(ref >> 16);
}

inline
BlockNumber refToMain(Uint32 ref){
  return (BlockNumber)((ref >> 16) & ((1 << NDBMT_BLOCK_BITS) - 1));
}

inline
BlockInstance refToInstance(Uint32 ref){
  return (BlockInstance)(ref >> (16 + NDBMT_BLOCK_BITS));
}

inline 
BlockReference numberToRef(Uint32 block, Uint32 node){
  assert(node < (1 << 16) && block < (1 << 16));
  return (BlockReference)(node | (block << 16));
}

inline 
BlockReference numberToRef(Uint32 main, Uint32 instance, Uint32 node){
  assert(node < (1 << 16) && 
         main < (1 << NDBMT_BLOCK_BITS) && 
         instance < (1 << NDBMT_BLOCK_INSTANCE_BITS));
  return (BlockReference)(node | 
                          (main << 16) | 
                          (instance << (16 + NDBMT_BLOCK_BITS)));
}

#endif