| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: mparena.h,v 1.4 2004/04/08 01:36:15 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 | #ifndef CATACOMB_MPARENA_H |
| 31 | #define CATACOMB_MPARENA_H |
| 32 | |
| 33 | #ifdef __cplusplus |
| 34 | extern "C" { |
| 35 | #endif |
| 36 | |
| 37 | /*----- Header files ------------------------------------------------------*/ |
| 38 | |
| 39 | #include <mLib/arena.h> |
| 40 | |
| 41 | #ifndef CATACOMB_MPW_H |
| 42 | # include "mpw.h" |
| 43 | #endif |
| 44 | |
| 45 | /*----- Data structures ---------------------------------------------------*/ |
| 46 | |
| 47 | /* --- @mparena_node@ --- * |
| 48 | * |
| 49 | * For internal use by the MP arena manager. The free blocks are held in a |
| 50 | * binary tree by size, held in the first digit of each vector. |
| 51 | */ |
| 52 | |
| 53 | typedef struct mparena_node { |
| 54 | struct mparena_node *left, *right; |
| 55 | mpw *v; |
| 56 | } mparena_node; |
| 57 | |
| 58 | /* --- @mparena@ --- * |
| 59 | * |
| 60 | * The actual arena. |
| 61 | */ |
| 62 | |
| 63 | typedef struct mparena { |
| 64 | mparena_node *root; |
| 65 | unsigned n; |
| 66 | arena *a; |
| 67 | } mparena; |
| 68 | |
| 69 | /*----- Standard arenas ---------------------------------------------------*/ |
| 70 | |
| 71 | extern mparena mparena_global; |
| 72 | #define MPARENA_GLOBAL (&mparena_global) |
| 73 | |
| 74 | extern mparena mparena_secure; |
| 75 | #define MPARENA_SECURE (&mparena_secure) |
| 76 | |
| 77 | /*----- Functions provided ------------------------------------------------*/ |
| 78 | |
| 79 | /* --- @mparena_create@ --- * |
| 80 | * |
| 81 | * Arguments: @mparena *a@ = pointer to arena block |
| 82 | * |
| 83 | * Returns: --- |
| 84 | * |
| 85 | * Use: Initializes an MP arena so that blocks can be allocated from |
| 86 | * it. |
| 87 | */ |
| 88 | |
| 89 | extern void mparena_create(mparena */*a*/); |
| 90 | |
| 91 | #define MPARENA_INIT { 0, 0, &arena_stdlib } |
| 92 | |
| 93 | /* --- @mparena_setarena@ --- * |
| 94 | * |
| 95 | * Arguments: @mparena *a@ = pointer to MP arena block |
| 96 | * @arena *aa@ = pointer to arena |
| 97 | * |
| 98 | * Returns: --- |
| 99 | * |
| 100 | * Use: Sets the underlying arena for an MP arena. |
| 101 | */ |
| 102 | |
| 103 | extern void mparena_setarena(mparena */*a*/, arena */*aa*/); |
| 104 | |
| 105 | /* --- @mparena_destroy@ --- * |
| 106 | * |
| 107 | * Arguments: @mparena *a@ = pointer to arena block |
| 108 | * |
| 109 | * Returns: --- |
| 110 | * |
| 111 | * Use: Frees an MP arena, and all the vectors held within it. The |
| 112 | * blocks which are currently allocated can be freed into some |
| 113 | * other MP arena, as long as the underlying arenas are the |
| 114 | * same. |
| 115 | */ |
| 116 | |
| 117 | extern void mparena_destroy(mparena */*a*/); |
| 118 | |
| 119 | /* --- @mparena_count@ --- * |
| 120 | * |
| 121 | * Arguments: @mparena *a@ = pointer to arena block |
| 122 | * |
| 123 | * Returns: Number of allocated blocks from this arena. |
| 124 | * |
| 125 | * Use: Reports the number of blocks allocated from the arena and not |
| 126 | * yet freed. |
| 127 | */ |
| 128 | |
| 129 | extern unsigned mparena_count(mparena */*a*/); |
| 130 | |
| 131 | /* --- @mpalloc@ --- * |
| 132 | * |
| 133 | * Arguments: @mparena *a@ = pointer to arena block |
| 134 | * @size_t sz@ = number of digits required |
| 135 | * |
| 136 | * Returns: Pointer to a suitably sized block. |
| 137 | * |
| 138 | * Use: Allocates a lump of data suitable for use as an array of MP |
| 139 | * digits. |
| 140 | */ |
| 141 | |
| 142 | extern mpw *mpalloc(mparena */*a*/, size_t /*sz*/); |
| 143 | |
| 144 | /* --- @mpfree@ --- * |
| 145 | * |
| 146 | * Arguments: @mparena *a@ = pointer to arena block |
| 147 | * @mpw *v@ = pointer to allocated vector |
| 148 | * |
| 149 | * Returns: --- |
| 150 | * |
| 151 | * Use: Returns an MP vector to an arena. |
| 152 | */ |
| 153 | |
| 154 | extern void mpfree(mparena */*a*/, mpw */*v*/); |
| 155 | |
| 156 | /*----- That's all, folks -------------------------------------------------*/ |
| 157 | |
| 158 | #ifdef __cplusplus |
| 159 | } |
| 160 | #endif |
| 161 | |
| 162 | #endif |