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/*
** Zabbix
** Copyright (C) 2001-2014 Zabbix SIA
**
** This program 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 2 of the License, or
** (at your option) any later version.
**
** This program 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, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
#include "common.h"
#include "ipc.h"
#include "log.h"
#include "zbxalgo.h"
#include "memalloc.h"
#include "strpool.h"
extern char *CONFIG_FILE;
static zbx_strpool_t strpool;
static zbx_hash_t __strpool_hash_func(const void *data);
static int __strpool_compare_func(const void *d1, const void *d2);
ZBX_MEM_FUNC_DECL(__strpool);
#define INIT_HASHSET_SIZE 1000
#define REFCOUNT_FIELD_SIZE sizeof(uint32_t)
/* private strpool functions */
static zbx_hash_t __strpool_hash_func(const void *data)
{
return ZBX_DEFAULT_STRING_HASH_FUNC((char *)data + REFCOUNT_FIELD_SIZE);
}
static int __strpool_compare_func(const void *d1, const void *d2)
{
return strcmp((char *)d1 + REFCOUNT_FIELD_SIZE, (char *)d2 + REFCOUNT_FIELD_SIZE);
}
ZBX_MEM_FUNC_IMPL(__strpool, strpool.mem_info);
/* public strpool interface */
void zbx_strpool_create(size_t size)
{
const char *__function_name = "zbx_strpool_create";
key_t shm_key;
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __function_name);
if (-1 == (shm_key = zbx_ftok(CONFIG_FILE, ZBX_IPC_STRPOOL_ID)))
{
zabbix_log(LOG_LEVEL_CRIT, "cannot create IPC key for string pool");
exit(FAIL);
}
zbx_mem_create(&strpool.mem_info, shm_key, ZBX_NO_MUTEX, size, "string pool", "CacheSize", 0);
strpool.hashset = __strpool_mem_malloc_func(NULL, sizeof(zbx_hashset_t));
zbx_hashset_create_ext(strpool.hashset, INIT_HASHSET_SIZE,
__strpool_hash_func, __strpool_compare_func,
__strpool_mem_malloc_func, __strpool_mem_realloc_func, __strpool_mem_free_func);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __function_name);
}
void zbx_strpool_destroy()
{
const char *__function_name = "zbx_strpool_destroy";
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __function_name);
zbx_mem_destroy(strpool.mem_info);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __function_name);
}
const char *zbx_strpool_intern(const char *str)
{
void *record;
uint32_t *refcount;
record = zbx_hashset_search(strpool.hashset, str - REFCOUNT_FIELD_SIZE);
if (NULL == record)
{
record = zbx_hashset_insert_ext(strpool.hashset, str - REFCOUNT_FIELD_SIZE,
REFCOUNT_FIELD_SIZE + strlen(str) + 1, REFCOUNT_FIELD_SIZE);
*(uint32_t *)record = 0;
}
refcount = (uint32_t *)record;
(*refcount)++;
return (char *)record + REFCOUNT_FIELD_SIZE;
}
const char *zbx_strpool_acquire(const char *str)
{
uint32_t *refcount;
refcount = (uint32_t *)(str - REFCOUNT_FIELD_SIZE);
(*refcount)++;
return str;
}
void zbx_strpool_release(const char *str)
{
uint32_t *refcount;
refcount = (uint32_t *)(str - REFCOUNT_FIELD_SIZE);
if (0 == --(*refcount))
zbx_hashset_remove(strpool.hashset, str - REFCOUNT_FIELD_SIZE);
}
void zbx_strpool_clear()
{
const char *__function_name = "zbx_strpool_clear";
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __function_name);
zbx_mem_clear(strpool.mem_info);
strpool.hashset = __strpool_mem_malloc_func(NULL, sizeof(zbx_hashset_t));
zbx_hashset_create_ext(strpool.hashset, INIT_HASHSET_SIZE,
__strpool_hash_func, __strpool_compare_func,
__strpool_mem_malloc_func, __strpool_mem_realloc_func, __strpool_mem_free_func);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __function_name);
}
const zbx_strpool_t *zbx_strpool_info()
{
return &strpool;
}
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