1 /* EINA - EFL data type library
2 * Copyright (C) 2007-2008 Jorge Luis Zapata Muga
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library;
16 * if not, see <http://www.gnu.org/licenses/>.
19 #ifndef EINA_MEMPOOL_H_
20 #define EINA_MEMPOOL_H_
22 #include "eina_types.h"
23 #include "eina_error.h"
24 #include "eina_module.h"
28 * @addtogroup Eina_Memory_Pool_Group Memory Pool
30 * @brief These functions provide memory pool management.
32 * Several mempool are available:
34 * @li @c buddy: It uses the
35 * <a href="http://en.wikipedia.org/wiki/Buddy_memory_allocation">"buddy
36 * allocator" algorithm</a> but the Eina implementation differs in the
37 * sense that the chunk information is not stored on the chunk itself,
38 * but on another memory area. This is useful for cases where the
39 * memory to manage might be slower to access, or limited (like video
41 * @li @c chained_pool: It is the default one. It allocates a big
42 * chunk of memory with malloc() and split the result in chunks of the
43 * requested size that are pushed inside a stack. When requested, it
44 * takes this pointer from the stack to give them to whoever wants
46 * @li @c ememoa_fixed and @c ememoa_unknown: experimental allocators
47 * which could be useful when a fixed amount of memory is needed.
48 * @li @c fixed_bitmap: It allocates with malloc) 32* the requested
49 * size and push the pool pointer in an rbtree. To find empty space in
50 * a pool, it will just search for the first bit set in an int (32
51 * bits). Then, when a pointer is freed, it will do a search inside
53 * @li @c pass_through: it just call malloc() and free(). It may be
54 * faster on some computers than using our own allocators (like having
55 * a huge L2 cache, over 4MB).
56 * @li @c one_big: It call just one time malloc for the requested number
57 * of items. Useful when you know in advance how many object of some
58 * type will live during the life of the mempool.
62 * @addtogroup Eina_Tools_Group Tools
68 * @defgroup Eina_Memory_Pool_Group Memory Pool
74 * @typedef Eina_Mempool
77 typedef struct _Eina_Mempool Eina_Mempool;
80 * @typedef Eina_Mempool_Backend
81 * Mempool backend type.
83 typedef struct _Eina_Mempool_Backend Eina_Mempool_Backend;
87 * @typedef Eina_Mempool_Repack_Cb
88 * Type for a callback who need to unreference an old object from a mempool
89 * and reference the new one instead. Memcpy is taken care by the mempool.
91 typedef void (*Eina_Mempool_Repack_Cb)(void *dst, void *src, void *data);
93 EAPI extern Eina_Error EINA_ERROR_NOT_MEMPOOL_MODULE;
95 EAPI Eina_Mempool *eina_mempool_add(const char *module, const char *context, const char *options, ...) EINA_MALLOC EINA_WARN_UNUSED_RESULT EINA_ARG_NONNULL(1);
96 EAPI void eina_mempool_del(Eina_Mempool *mp) EINA_ARG_NONNULL(1);
98 static inline void *eina_mempool_realloc(Eina_Mempool *mp, void *element, unsigned int size) EINA_ARG_NONNULL(1) EINA_WARN_UNUSED_RESULT;
99 static inline void *eina_mempool_malloc(Eina_Mempool *mp, unsigned int size) EINA_MALLOC EINA_ARG_NONNULL(1) EINA_WARN_UNUSED_RESULT;
100 static inline void eina_mempool_free(Eina_Mempool *mp, void *element) EINA_ARG_NONNULL(1);
102 EAPI void eina_mempool_repack(Eina_Mempool *mp,
103 Eina_Mempool_Repack_Cb cb,
104 void *data) EINA_ARG_NONNULL(1, 2);
105 EAPI void eina_mempool_gc(Eina_Mempool *mp) EINA_ARG_NONNULL(1);
106 EAPI void eina_mempool_statistics(Eina_Mempool *mp) EINA_ARG_NONNULL(1);
108 EAPI Eina_Bool eina_mempool_register(Eina_Mempool_Backend *be) EINA_ARG_NONNULL(1);
109 EAPI void eina_mempool_unregister(Eina_Mempool_Backend *be) EINA_ARG_NONNULL(1);
111 EAPI unsigned int eina_mempool_alignof(unsigned int size);
113 #include "eina_inline_mempool.x"
123 #endif /* EINA_MEMPOOL_H_ */