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1 | /* -*-c-*- |
2 | * |
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3 | * Abstraction for memory allocation arenas |
4 | * |
5 | * (c) 2000 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of the mLib utilities library. |
11 | * |
12 | * mLib is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU Library General Public License as |
14 | * published by the Free Software Foundation; either version 2 of the |
15 | * License, or (at your option) any later version. |
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16 | * |
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17 | * mLib is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU Library General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with mLib; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
26 | */ |
27 | |
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28 | #ifndef MLIB_ARENA_H |
29 | #define MLIB_ARENA_H |
30 | |
31 | #ifdef __cplusplus |
32 | extern "C" { |
33 | #endif |
34 | |
35 | /*----- Header files ------------------------------------------------------*/ |
36 | |
37 | #include <stdlib.h> |
38 | |
39 | /*----- Data structures ---------------------------------------------------*/ |
40 | |
41 | /* --- An arena structure --- */ |
42 | |
43 | typedef struct arena { |
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44 | const struct arena_ops *ops; |
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45 | } arena; |
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46 | |
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47 | typedef struct arena_ops { |
48 | void *(*alloc)(arena */*a*/, size_t /*sz*/); |
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49 | void *(*realloc)(arena */*a*/, void */*p*/, size_t /*sz*/, size_t /*osz*/); |
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50 | void (*free)(arena */*a*/, void */*p*/); |
51 | void (*purge)(arena */*a*/); |
52 | } arena_ops; |
53 | |
54 | /*----- Global variables --------------------------------------------------*/ |
55 | |
56 | extern arena *arena_global; /* Standard global arena */ |
57 | extern arena arena_stdlib; /* Arena based on @malloc@/@free@ */ |
58 | |
59 | /*----- Functions provided ------------------------------------------------*/ |
60 | |
61 | /* --- @arena_fakerealloc@ --- * |
62 | * |
63 | * Arguments: @arena *a@ = pointer to arena block |
64 | * @void *p@ = pointer to memory block to resize |
65 | * @size_t sz@ = size desired for the block |
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66 | * @size_t osz@ = size of the old block |
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67 | * |
68 | * Returns: --- |
69 | * |
70 | * Use: Standard fake @realloc@ function, for use if you don't |
71 | * support @realloc@ properly. |
72 | */ |
73 | |
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74 | extern void *arena_fakerealloc(arena */*a*/, void */*p*/, |
75 | size_t /*sz*/, size_t /*osz*/); |
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76 | |
77 | /* --- Useful macros --- */ |
78 | |
79 | #define A_ALLOC(a, sz) (((a)->ops->alloc)((a), (sz))) |
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80 | #define A_REALLOC(a, p, sz, osz) (((a)->ops->realloc)((a), (p), (sz), (osz))) |
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81 | #define A_FREE(a, p) (((a)->ops->free)((a), (p))) |
82 | |
83 | /* --- Simple function equivalents --- */ |
84 | |
85 | extern void *a_alloc(arena */*a*/, size_t /*sz*/); |
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86 | extern void *a_realloc(arena */*a*/, void */*p*/, |
87 | size_t /*sz*/, size_t /*osz*/); |
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88 | extern void a_free(arena */*a*/, void */*p*/); |
89 | |
90 | /*----- That's all, folks -------------------------------------------------*/ |
91 | |
92 | #ifdef __cplusplus |
93 | } |
94 | #endif |
95 | |
96 | #endif |