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/*
Copyright (c) 2008-2009 Z RESEARCH, Inc. <http://www.zresearch.com>
This file is part of GlusterFS.
GlusterFS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
GlusterFS is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>.
*/
#include "mem-pool.h"
#include "logging.h"
#include <stdlib.h>
#define GF_MEM_POOL_PAD_BOUNDRY 16
struct mem_pool *
mem_pool_new_fn (unsigned long sizeof_type,
unsigned long count)
{
struct mem_pool *mem_pool = NULL;
int pad = 0;
unsigned long padded_sizeof_type = 0;
void *pool = NULL;
int i = 0;
struct list_head *list = NULL;
if (!sizeof_type || !count) {
gf_log ("mem-pool", GF_LOG_ERROR, "invalid argument");
return NULL;
}
pad = GF_MEM_POOL_PAD_BOUNDRY -
(sizeof_type % GF_MEM_POOL_PAD_BOUNDRY);
padded_sizeof_type = sizeof_type + pad;
mem_pool = CALLOC (sizeof (*mem_pool), 1);
if (!mem_pool)
return NULL;
LOCK_INIT (&mem_pool->lock);
INIT_LIST_HEAD (&mem_pool->list);
mem_pool->padded_sizeof_type = padded_sizeof_type;
mem_pool->cold_count = count;
pool = CALLOC (count, sizeof_type + pad);
if (!pool) {
FREE (mem_pool);
return NULL;
}
for (i = 0; i < count; i++) {
list = pool + (i * (sizeof_type + pad));
INIT_LIST_HEAD (list);
list_add_tail (list, &mem_pool->list);
}
mem_pool->pool = pool;
mem_pool->pool_end = pool + (count * (sizeof_type + pad));
return mem_pool;
}
void *
mem_get (struct mem_pool *mem_pool)
{
struct list_head *list = NULL;
void *ptr = NULL;
if (!mem_pool) {
gf_log ("mem-pool", GF_LOG_ERROR, "invalid argument");
return NULL;
}
LOCK (&mem_pool->lock);
{
if (mem_pool->cold_count) {
list = mem_pool->list.next;
list_del (list);
mem_pool->hot_count++;
mem_pool->cold_count--;
ptr = list;
}
}
UNLOCK (&mem_pool->lock);
if (ptr == NULL) {
ptr = MALLOC (mem_pool->padded_sizeof_type);
if (!ptr) {
return NULL;
}
LOCK (&mem_pool->lock);
{
mem_pool->hot_count ++;
}
UNLOCK (&mem_pool->lock);
}
return ptr;
}
static int
__is_member (struct mem_pool *pool, void *ptr)
{
if (!pool || !ptr) {
gf_log ("mem-pool", GF_LOG_ERROR, "invalid argument");
return -1;
}
if (ptr < pool->pool || ptr >= pool->pool_end)
return 0;
if ((ptr - pool->pool) % pool->padded_sizeof_type)
return -1;
return 1;
}
void
mem_put (struct mem_pool *pool, void *ptr)
{
struct list_head *list = NULL;
if (!pool || !ptr) {
gf_log ("mem-pool", GF_LOG_ERROR, "invalid argument");
return;
}
list = ptr;
LOCK (&pool->lock);
{
pool->hot_count--;
switch (__is_member (pool, ptr))
{
case 1:
pool->cold_count++;
list_add (list, &pool->list);
break;
case -1:
/* log error */
abort ();
break;
case 0:
free (ptr);
break;
default:
/* log error */
break;
}
}
UNLOCK (&pool->lock);
if (ptr)
free (ptr);
}
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