/* glpdmp.h (dynamic memory pool) */

/***********************************************************************

*  This code is part of GLPK (GNU Linear Programming Kit).

*

*  Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,

*  2009, 2010 Andrew Makhorin, Department for Applied Informatics,

*  Moscow Aviation Institute, Moscow, Russia. All rights reserved.

*  E-mail: <mao@gnu.org>.

*

*  GLPK 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, either version 3 of the License, or

*  (at your option) any later version.

*

*  GLPK 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 GLPK. If not, see <http://www.gnu.org/licenses/>.

***********************************************************************/

#ifndef GLPDMP_H

#define GLPDMP_H

#include "glpenv.h"

typedef struct DMP DMP;

#define DMP_BLK_SIZE 8000

/* size of memory blocks, in bytes, allocated for memory pools */

struct DMP

{     /* dynamic memory pool */

#if 0

      int size;

      /* size of atoms, in bytes, 1 <= size <= 256; if size = 0, atoms

         may have different sizes */

#endif

      void *avail[32];

      /* avail[k], 0 <= k <= 31, is a pointer to the first available

         (free) cell of (k+1)*8 bytes long; in the beginning of each

         free cell there is a pointer to another free cell of the same

         length */

      void *block;

      /* pointer to the most recently allocated memory block; in the

         beginning of each allocated memory block there is a pointer to

         the previously allocated memory block */

      int used;

      /* number of bytes used in the most recently allocated memory

         block */

      glp_long count;

      /* number of atoms which are currently in use */

};

#define dmp_create_pool _glp_dmp_create_pool

DMP *dmp_create_pool(void);

/* create dynamic memory pool */

#define dmp_get_atom _glp_dmp_get_atom

void *dmp_get_atom(DMP *pool, int size);

/* get free atom from dynamic memory pool */

#define dmp_free_atom _glp_dmp_free_atom

void dmp_free_atom(DMP *pool, void *atom, int size);

/* return atom to dynamic memory pool */

#define dmp_in_use _glp_dmp_in_use

glp_long dmp_in_use(DMP *pool);

/* determine how many atoms are still in use */

#define dmp_delete_pool _glp_dmp_delete_pool

void dmp_delete_pool(DMP *pool);

/* delete dynamic memory pool */

#endif

/* eof */