3 * $Id: arena.h,v 1.1 2000/06/17 10:37:53 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 1.1 2000/06/17 10:37:53 mdw
34 * Basic arena management.
45 /*----- Header files ------------------------------------------------------*/
49 /*----- Data structures ---------------------------------------------------*/
51 /* --- An arena structure --- */
53 typedef struct arena {
54 struct arena_ops *ops;
57 typedef struct arena_ops {
58 void *(*alloc)(arena */*a*/, size_t /*sz*/);
59 void *(*realloc)(arena */*a*/, void */*p*/, size_t /*sz*/);
60 void (*free)(arena */*a*/, void */*p*/);
61 void (*purge)(arena */*a*/);
64 /*----- Global variables --------------------------------------------------*/
66 extern arena *arena_global; /* Standard global arena */
67 extern arena arena_stdlib; /* Arena based on @malloc@/@free@ */
69 /*----- Functions provided ------------------------------------------------*/
71 /* --- @arena_fakerealloc@ --- *
73 * Arguments: @arena *a@ = pointer to arena block
74 * @void *p@ = pointer to memory block to resize
75 * @size_t sz@ = size desired for the block
79 * Use: Standard fake @realloc@ function, for use if you don't
80 * support @realloc@ properly.
83 extern void *arena_fakerealloc(arena */*a*/, void */*p*/, size_t /*sz*/);
85 /* --- Useful macros --- */
87 #define A_ALLOC(a, sz) (((a)->ops->alloc)((a), (sz)))
88 #define A_REALLOC(a, p, sz) (((a)->ops->realloc)((a), (p), (sz)))
89 #define A_FREE(a, p) (((a)->ops->free)((a), (p)))
91 /* --- Simple function equivalents --- */
93 extern void *a_alloc(arena */*a*/, size_t /*sz*/);
94 extern void *a_realloc(arena */*a*/, void */*p*/, size_t /*sz*/);
95 extern void a_free(arena */*a*/, void */*p*/);
97 /*----- That's all, folks -------------------------------------------------*/