2 * Copyright 2009 Nicolai Hähnle <nhaehnle@gmail.com>
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * on the rights to use, copy, modify, merge, publish, distribute, sub
8 * license, and/or sell copies of the Software, and to permit persons to whom
9 * the Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
21 * USE OR OTHER DEALINGS IN THE SOFTWARE. */
23 #include "memory_pool.h"
30 #define POOL_LARGE_ALLOC 4096
35 struct memory_block
* next
;
38 void memory_pool_init(struct memory_pool
* pool
)
40 memset(pool
, 0, sizeof(struct memory_pool
));
44 void memory_pool_destroy(struct memory_pool
* pool
)
47 struct memory_block
* block
= pool
->blocks
;
48 pool
->blocks
= block
->next
;
53 static void refill_pool(struct memory_pool
* pool
)
55 unsigned int blocksize
= pool
->total_allocated
;
56 struct memory_block
* newblock
;
59 blocksize
= 2*POOL_LARGE_ALLOC
;
61 newblock
= malloc(blocksize
);
62 newblock
->next
= pool
->blocks
;
63 pool
->blocks
= newblock
;
65 pool
->head
= (unsigned char*)(newblock
+ 1);
66 pool
->end
= ((unsigned char*)newblock
) + blocksize
;
67 pool
->total_allocated
+= blocksize
;
71 void * memory_pool_malloc(struct memory_pool
* pool
, unsigned int bytes
)
73 if (bytes
< POOL_LARGE_ALLOC
) {
76 if (pool
->head
+ bytes
> pool
->end
)
79 assert(pool
->head
+ bytes
<= pool
->end
);
84 pool
->head
= (unsigned char*)(((unsigned long)pool
->head
+ POOL_ALIGN
- 1) & ~(POOL_ALIGN
- 1));
88 struct memory_block
* block
= malloc(bytes
+ sizeof(struct memory_block
));
90 block
->next
= pool
->blocks
;