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/*
* Memory Pool implementation logic.
*/
#include "cache.h"
#include "mem-pool.h"
static struct mp_block *mem_pool_alloc_block(struct mem_pool *mem_pool, size_t block_alloc)
{
struct mp_block *p;
mem_pool->pool_alloc += sizeof(struct mp_block) + block_alloc;
p = xmalloc(st_add(sizeof(struct mp_block), block_alloc));
p->next_block = mem_pool->mp_block;
p->next_free = (char *)p->space;
p->end = p->next_free + block_alloc;
mem_pool->mp_block = p;
return p;
}
void *mem_pool_alloc(struct mem_pool *mem_pool, size_t len)
{
struct mp_block *p;
void *r;
/* round up to a 'uintmax_t' alignment */
if (len & (sizeof(uintmax_t) - 1))
len += sizeof(uintmax_t) - (len & (sizeof(uintmax_t) - 1));
for (p = mem_pool->mp_block; p; p = p->next_block)
if (p->end - p->next_free >= len)
break;
if (!p) {
if (len >= (mem_pool->block_alloc / 2)) {
mem_pool->pool_alloc += len;
return xmalloc(len);
}
p = mem_pool_alloc_block(mem_pool, mem_pool->block_alloc);
}
r = p->next_free;
p->next_free += len;
return r;
}
void *mem_pool_calloc(struct mem_pool *mem_pool, size_t count, size_t size)
{
size_t len = st_mult(count, size);
void *r = mem_pool_alloc(mem_pool, len);
memset(r, 0, len);
return r;
}
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