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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "mempool.h"
#ifdef __amigaos4__
#include <proto/exec.h>
#include <proto/onchipmem.h>
struct Library *ocmb;
struct OCMIFace *IOCM = NULL;
#endif
#define MEMORY_POOL_ALLOCED_CONST ((void *) 0xFFFFFFFFu)
memory_pool_t * memory_pool_create(size_t bs, size_t c)
{
memory_pool_t *mp = malloc(sizeof(memory_pool_t));
if (!mp)
return NULL;
mp->block_size = bs;
mp->count = c;
mp->pool = NULL;
if((ocmb = IExec->OpenResource("onchipmem.resource"))) {
if((IOCM = (struct OCMIFace *)IExec->GetInterface((struct Library *)ocmb, "main", 1, NULL))) {
mp->pool = IOCM->ObtainOnChipMem();
}
}
if(mp->pool == NULL) {
mp->pool = malloc((mp->block_size + sizeof(void *)) * mp->count);
}
memory_pool_clear(mp);
mp->empty_blocks = mp->pool;
return mp;
}
void memory_pool_destroy(memory_pool_t *mp)
{
if (!mp)
return;
memory_pool_clear(mp);
/**TODO: Track if this is an OCM or standard memory pool.
* At the moment we have no way of freeing on exit so it doesn't matter.
IOCM->ReleaseOnChipMem();
IExec->DropInterface((struct Interface *)IOCM);
free(mp->pool);
*/
free(mp);
}
void memory_pool_clear(memory_pool_t *mp)
{
if (!mp)
return;
size_t i;
void **p;
for (i = 0; i < mp->count - 1; i++)
{
p = (void **) ((uint8_t *) mp->pool + (mp->block_size * (i + 1) +
sizeof(void *) * i));
*p = (uint8_t *) mp->pool + (mp->block_size + sizeof(void *)) * (i + 1);
}
p = (void **) ((uint8_t *) mp->pool + (mp->block_size * mp->count +
sizeof(void *) * (mp->count - 1)));
*p = NULL;
mp->empty_blocks = mp->pool;
}
void memory_pool_dump(memory_pool_t *mp, void (* print_func) (void *value))
{
printf("start: %p, size: %d, count: %d\n", mp->pool,
(mp->block_size + sizeof(void *)) * mp->count, mp->count);
void *block;
void **next;
size_t i;
for (i = 0; i < mp->count; i++)
{
block = (void *) ((uint8_t *) mp->pool + (mp->block_size * i) +
sizeof(void *) * i);
next = (void **) ((uint8_t *) block + sizeof(void *));
printf("block #%i(%p):", i, block);
if (*next == MEMORY_POOL_ALLOCED_CONST)
{
printf(" allocated");
if (print_func)
{
printf(", value: ");
print_func(block);
}
printf("\n");
} else
{
printf(" free, next address %p\n", *next);
}
}
}
void * memory_pool_alloc(memory_pool_t *mp)
{
void *p;
if (mp->empty_blocks)
{
p = mp->empty_blocks;
mp->empty_blocks = * (void **) ((uint8_t *) mp->empty_blocks +
mp->block_size);
*(void **) ((uint8_t *) p + mp->block_size) = MEMORY_POOL_ALLOCED_CONST;
return p;
} else
{
return NULL;
}
}
bool memory_pool_free(memory_pool_t *mp, void *p)
{
if (p && (p >= mp->pool) && (p <= (void *) ((uint8_t *) mp->pool +
(mp->block_size + sizeof(void *)) * mp->count)))
{
*(void **) ((uint8_t *) p + mp->block_size) = mp->empty_blocks;
mp->empty_blocks = p;
return true;
} else {
return false;
}
}
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