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88 lines (75 loc) · 2.66 KB
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/*
* Copyright (C) 2001-2005 iptel.org
* Copyright (C) 2007-2008 1&1 Internet AG
*
* This file is part of opensips, a free SIP server.
*
* opensips 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
*
* opensips 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
*/
/**
* \file db/db_pool.h
* \brief Functions for managing a pool of database connections.
*/
#ifndef _DB_POOL_H
#define _DB_POOL_H
#include "../globals.h"
#include "db_id.h"
#include "db_con.h"
struct db_transfer {
int fd;
struct pool_con *con;
};
/**
* This is a stub that contains all attributes
* that pool members must have, it is not really
* used, real connection structures are created
* by database backends. All such structures (
* created by the backends) must have these
* attributes.
*/
struct pool_con {
struct db_id* id; /**< Connection identifier */
unsigned int ref; /**< Reference count */
struct pool_con *async_pool; /**< Subpool of identical database handles */
int no_transfers; /**< Number of async queries to this backend */
struct db_transfer *transfers; /**< Array of ongoing async operations */
struct pool_con *next; /**< Next element in the pool (different db_id) */
};
/**
* Search the pool for a connection with the identifier equal to
* the id.
* \param id searched id
* \return the connection if it could be found, NULL otherwise
*/
struct pool_con* pool_get(const struct db_id* id);
/**
* Insert a new connection into the pool.
* \param con the inserted connection
*/
void pool_insert(struct pool_con* con);
/**
* Release a connection from the pool, the function
* would return 1 when if the connection is not
* referenced anymore and thus can be closed and
* deleted by the backend. The function returns
* 0 if the connection should still be kept open
* because some other module is still using it.
* The function returns -1 if the connection is
* not in the pool.
* \param con connection that should be removed
* \return 1 if the connection can be freed, 0 if it can't be freed, -1 if not found
*/
int pool_remove(struct pool_con* con);
#endif /* _POOL_H */