3 * $Id: arena.h,v 1.2 2000/07/16 12:29:16 mdw Exp $
5 * Abstraction for memory allocation arenas
7 * (c) 2000 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the mLib utilities library.
14 * mLib 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.
19 * mLib 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.
24 * You should have received a copy of the GNU Library General Public
25 * License along with mLib; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.2 2000/07/16 12:29:16 mdw
34 * Change to arena `realloc' interface, to fix a design bug.
36 * Revision 1.1 2000/06/17 10:37:53 mdw
37 * Basic arena management.
48 /*----- Header files ------------------------------------------------------*/
52 /*----- Data structures ---------------------------------------------------*/
54 /* --- An arena structure --- */
56 typedef struct arena
{
57 struct arena_ops
*ops
;
60 typedef struct arena_ops
{
61 void *(*alloc
)(arena */
*a*/
, size_t /*sz*/);
62 void *(*realloc
)(arena */
*a*/
, void */
*p*/
, size_t /*sz*/, size_t /*osz*/);
63 void (*free
)(arena */
*a*/
, void */
*p*/
);
64 void (*purge
)(arena */
*a*/
);
67 /*----- Global variables --------------------------------------------------*/
69 extern arena
*arena_global
; /* Standard global arena */
70 extern arena arena_stdlib
; /* Arena based on @malloc@/@free@ */
72 /*----- Functions provided ------------------------------------------------*/
74 /* --- @arena_fakerealloc@ --- *
76 * Arguments: @arena *a@ = pointer to arena block
77 * @void *p@ = pointer to memory block to resize
78 * @size_t sz@ = size desired for the block
79 * @size_t osz@ = size of the old block
83 * Use: Standard fake @realloc@ function, for use if you don't
84 * support @realloc@ properly.
87 extern void *arena_fakerealloc(arena */
*a*/
, void */
*p*/
,
88 size_t /*sz*/, size_t /*osz*/);
90 /* --- Useful macros --- */
92 #define A_ALLOC(a, sz) (((a)->ops->alloc)((a), (sz)))
93 #define A_REALLOC(a, p, sz, osz) (((a)->ops->realloc)((a), (p), (sz), (osz)))
94 #define A_FREE(a, p) (((a)->ops->free)((a), (p)))
96 /* --- Simple function equivalents --- */
98 extern void *a_alloc(arena */
*a*/
, size_t /*sz*/);
99 extern void *a_realloc(arena */
*a*/
, void */
*p*/
,
100 size_t /*sz*/, size_t /*osz*/);
101 extern void a_free(arena */
*a*/
, void */
*p*/
);
103 /*----- That's all, folks -------------------------------------------------*/