| 1 | /* |
| 2 | * MessagePack for C memory pool implementation |
| 3 | * |
| 4 | * Copyright (C) 2008-2010 FURUHASHI Sadayuki |
| 5 | * |
| 6 | * Distributed under the Boost Software License, Version 1.0. |
| 7 | * (See accompanying file LICENSE_1_0.txt or copy at |
| 8 | * http://www.boost.org/LICENSE_1_0.txt) |
| 9 | */ |
| 10 | #ifndef MSGPACK_ZONE_H |
| 11 | #define MSGPACK_ZONE_H |
| 12 | |
| 13 | #include "sysdep.h" |
| 14 | |
| 15 | #ifdef __cplusplus |
| 16 | extern "C" { |
| 17 | #endif |
| 18 | |
| 19 | |
| 20 | /** |
| 21 | * @defgroup msgpack_zone Memory zone |
| 22 | * @ingroup msgpack |
| 23 | * @{ |
| 24 | */ |
| 25 | |
| 26 | typedef struct msgpack_zone_finalizer { |
| 27 | void (*func)(void* data); |
| 28 | void* data; |
| 29 | } msgpack_zone_finalizer; |
| 30 | |
| 31 | typedef struct msgpack_zone_finalizer_array { |
| 32 | msgpack_zone_finalizer* tail; |
| 33 | msgpack_zone_finalizer* end; |
| 34 | msgpack_zone_finalizer* array; |
| 35 | } msgpack_zone_finalizer_array; |
| 36 | |
| 37 | struct msgpack_zone_chunk; |
| 38 | typedef struct msgpack_zone_chunk msgpack_zone_chunk; |
| 39 | |
| 40 | typedef struct msgpack_zone_chunk_list { |
| 41 | size_t free; |
| 42 | char* ptr; |
| 43 | msgpack_zone_chunk* head; |
| 44 | } msgpack_zone_chunk_list; |
| 45 | |
| 46 | typedef struct msgpack_zone { |
| 47 | msgpack_zone_chunk_list chunk_list; |
| 48 | msgpack_zone_finalizer_array finalizer_array; |
| 49 | size_t chunk_size; |
| 50 | } msgpack_zone; |
| 51 | |
| 52 | #ifndef MSGPACK_ZONE_CHUNK_SIZE |
| 53 | #define MSGPACK_ZONE_CHUNK_SIZE 8192 |
| 54 | #endif |
| 55 | |
| 56 | MSGPACK_DLLEXPORT |
| 57 | bool msgpack_zone_init(msgpack_zone* zone, size_t chunk_size); |
| 58 | MSGPACK_DLLEXPORT |
| 59 | void msgpack_zone_destroy(msgpack_zone* zone); |
| 60 | |
| 61 | MSGPACK_DLLEXPORT |
| 62 | msgpack_zone* msgpack_zone_new(size_t chunk_size); |
| 63 | MSGPACK_DLLEXPORT |
| 64 | void msgpack_zone_free(msgpack_zone* zone); |
| 65 | |
| 66 | static inline void* msgpack_zone_malloc(msgpack_zone* zone, size_t size); |
| 67 | static inline void* msgpack_zone_malloc_no_align(msgpack_zone* zone, size_t size); |
| 68 | |
| 69 | static inline bool msgpack_zone_push_finalizer(msgpack_zone* zone, |
| 70 | void (*func)(void* data), void* data); |
| 71 | |
| 72 | static inline void msgpack_zone_swap(msgpack_zone* a, msgpack_zone* b); |
| 73 | |
| 74 | MSGPACK_DLLEXPORT |
| 75 | bool msgpack_zone_is_empty(msgpack_zone* zone); |
| 76 | |
| 77 | MSGPACK_DLLEXPORT |
| 78 | void msgpack_zone_clear(msgpack_zone* zone); |
| 79 | |
| 80 | /** @} */ |
| 81 | |
| 82 | |
| 83 | #ifndef MSGPACK_ZONE_ALIGN |
| 84 | #define MSGPACK_ZONE_ALIGN sizeof(void*) |
| 85 | #endif |
| 86 | |
| 87 | MSGPACK_DLLEXPORT |
| 88 | void* msgpack_zone_malloc_expand(msgpack_zone* zone, size_t size); |
| 89 | |
| 90 | static inline void* msgpack_zone_malloc_no_align(msgpack_zone* zone, size_t size) |
| 91 | { |
| 92 | char* ptr; |
| 93 | msgpack_zone_chunk_list* cl = &zone->chunk_list; |
| 94 | |
| 95 | if(zone->chunk_list.free < size) { |
| 96 | return msgpack_zone_malloc_expand(zone, size); |
| 97 | } |
| 98 | |
| 99 | ptr = cl->ptr; |
| 100 | cl->free -= size; |
| 101 | cl->ptr += size; |
| 102 | |
| 103 | return ptr; |
| 104 | } |
| 105 | |
| 106 | static inline void* msgpack_zone_malloc(msgpack_zone* zone, size_t size) |
| 107 | { |
| 108 | char* aligned = |
| 109 | (char*)( |
| 110 | (uintptr_t)( |
| 111 | zone->chunk_list.ptr + (MSGPACK_ZONE_ALIGN - 1) |
| 112 | ) & ~(uintptr_t)(MSGPACK_ZONE_ALIGN - 1) |
| 113 | ); |
| 114 | size_t adjusted_size = size + (size_t)(aligned - zone->chunk_list.ptr); |
| 115 | if(zone->chunk_list.free >= adjusted_size) { |
| 116 | zone->chunk_list.free -= adjusted_size; |
| 117 | zone->chunk_list.ptr += adjusted_size; |
| 118 | return aligned; |
| 119 | } |
| 120 | { |
| 121 | void* ptr = msgpack_zone_malloc_expand(zone, size + (MSGPACK_ZONE_ALIGN - 1)); |
| 122 | if (ptr) { |
| 123 | return (char*)((uintptr_t)(ptr) & ~(uintptr_t)(MSGPACK_ZONE_ALIGN - 1)); |
| 124 | } |
| 125 | } |
| 126 | return NULL; |
| 127 | } |
| 128 | |
| 129 | |
| 130 | bool msgpack_zone_push_finalizer_expand(msgpack_zone* zone, |
| 131 | void (*func)(void* data), void* data); |
| 132 | |
| 133 | static inline bool msgpack_zone_push_finalizer(msgpack_zone* zone, |
| 134 | void (*func)(void* data), void* data) |
| 135 | { |
| 136 | msgpack_zone_finalizer_array* const fa = &zone->finalizer_array; |
| 137 | msgpack_zone_finalizer* fin = fa->tail; |
| 138 | |
| 139 | if(fin == fa->end) { |
| 140 | return msgpack_zone_push_finalizer_expand(zone, func, data); |
| 141 | } |
| 142 | |
| 143 | fin->func = func; |
| 144 | fin->data = data; |
| 145 | |
| 146 | ++fa->tail; |
| 147 | |
| 148 | return true; |
| 149 | } |
| 150 | |
| 151 | static inline void msgpack_zone_swap(msgpack_zone* a, msgpack_zone* b) |
| 152 | { |
| 153 | msgpack_zone tmp = *a; |
| 154 | *a = *b; |
| 155 | *b = tmp; |
| 156 | } |
| 157 | |
| 158 | |
| 159 | #ifdef __cplusplus |
| 160 | } |
| 161 | #endif |
| 162 | |
| 163 | #endif /* msgpack/zone.h */ |