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   1 /* -*-c-*-
   2  *
   3  * $Id: mparena.h,v 1.3 2000/06/17 11:35:48 mdw Exp $
   4  *
   5  * Allocation and freeing of MP buffers
   6  *
   7  * (c) 1999 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Catacomb.
  13  *
  14  * Catacomb is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * Catacomb is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with Catacomb; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: mparena.h,v $
  33  * Revision 1.3  2000/06/17 11:35:48  mdw
  34  * Overhaul to use mLib's arena system underneath.
  35  *
  36  * Revision 1.2  1999/12/10 23:28:59  mdw
  37  * Memory allocation counting.
  38  *
  39  * Revision 1.1  1999/11/17 18:02:16  mdw
  40  * New multiprecision integer arithmetic suite.
  41  *
  42  */
  43
  44 #ifndef CATACOMB_MPARENA_H
  45 #define CATACOMB_MPARENA_H
  46
  47 #ifdef __cplusplus
  48   extern "C" {
  49 #endif
  50
  51 /*----- Header files ------------------------------------------------------*/
  52
  53 #include <mLib/arena.h>
  54
  55 #ifndef CATACOMB_MPW_H
  56 #  include "mpw.h"
  57 #endif
  58
  59 /*----- Data structures ---------------------------------------------------*/
  60
  61 /* --- @mparena_node@ --- *
  62  *
  63  * For internal use by the MP arena manager.  The free blocks are held in a
  64  * binary tree by size, held in the first digit of each vector.
  65  */
  66
  67 typedef struct mparena_node {
  68   struct mparena_node *left, *right;
  69   mpw *v;
  70 } mparena_node;
  71
  72 /* --- @mparena@ --- *
  73  *
  74  * The actual arena.
  75  */
  76
  77 typedef struct mparena {
  78   mparena_node *root;
  79   unsigned n;
  80   arena *a;
  81 } mparena;
  82
  83 /*----- Standard arenas ---------------------------------------------------*/
  84
  85 extern mparena mparena_global;
  86 #define MPARENA_GLOBAL (&mparena_global)
  87
  88 extern mparena mparena_secure;
  89 #define MPARENA_SECURE (&mparena_secure)
  90
  91 /*----- Functions provided ------------------------------------------------*/
  92
  93 /* --- @mparena_create@ --- *
  94  *
  95  * Arguments:   @mparena *a@ = pointer to arena block
  96  *
  97  * Returns:     ---
  98  *
  99  * Use:         Initializes an MP arena so that blocks can be allocated from
 100  *              it.
 101  */
 102
 103 extern void mparena_create(mparena */*a*/);
 104
 105 #define MPARENA_INIT { 0, 0, &arena_stdlib }
 106
 107 /* --- @mparena_setarena@ --- *
 108  *
 109  * Arguments:   @mparena *a@ = pointer to MP arena block
 110  *              @arena *aa@ = pointer to arena
 111  *
 112  * Returns:     ---
 113  *
 114  * Use:         Sets the underlying arena for an MP arena.
 115  */
 116
 117 extern void mparena_setarena(mparena */*a*/, arena */*aa*/);
 118
 119 /* --- @mparena_destroy@ --- *
 120  *
 121  * Arguments:   @mparena *a@ = pointer to arena block
 122  *
 123  * Returns:     ---
 124  *
 125  * Use:         Frees an MP arena, and all the vectors held within it.  The
 126  *              blocks which are currently allocated can be freed into some
 127  *              other MP arena, as long as the underlying arenas are the
 128  *              same.
 129  */
 130
 131 extern void mparena_destroy(mparena */*a*/);
 132
 133 /* --- @mparena_count@ --- *
 134  *
 135  * Arguments:   @mparena *a@ = pointer to arena block
 136  *
 137  * Returns:     Number of allocated blocks from this arena.
 138  *
 139  * Use:         Reports the number of blocks allocated from the arena and not
 140  *              yet freed.
 141  */
 142
 143 extern unsigned mparena_count(mparena */*a*/);
 144
 145 /* --- @mpalloc@ --- *
 146  *
 147  * Arguments:   @mparena *a@ = pointer to arena block
 148  *              @size_t sz@ = number of digits required
 149  *
 150  * Returns:     Pointer to a suitably sized block.
 151  *
 152  * Use:         Allocates a lump of data suitable for use as an array of MP
 153  *              digits.
 154  */
 155
 156 extern mpw *mpalloc(mparena */*a*/, size_t /*sz*/);
 157
 158 /* --- @mpfree@ --- *
 159  *
 160  * Arguments:   @mparena *a@ = pointer to arena block
 161  *              @mpw *v@ = pointer to allocated vector
 162  *
 163  * Returns:     ---
 164  *
 165  * Use:         Returns an MP vector to an arena.
 166  */
 167
 168 extern void mpfree(mparena */*a*/, mpw */*v*/);
 169
 170 /*----- That's all, folks -------------------------------------------------*/
 171
 172 #ifdef __cplusplus
 173   }
 174 #endif
 175
 176 #endif