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121 lines
2.6 KiB
121 lines
2.6 KiB
/*
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* Copyright (C) 2001-2005 iptel.org
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* Copyright (C) 2007-2008 1&1 Internet AG
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*
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* This file is part of Kamailio, a free SIP server.
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*
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* Kamailio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version
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*
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* Kamailio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* \file lib/srdb1/db_pool.c
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* \brief Functions for managing a pool of database connections.
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* \ingroup db1
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*/
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#include "../../dprint.h"
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#include "db_pool.h"
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/* The head of the pool */
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static struct pool_con* db_pool = 0;
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/*
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* Search the pool for a connection with
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* the identifier equal to id, NULL is returned
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* when no connection is found
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*/
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struct pool_con* pool_get(const struct db_id* id)
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{
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struct pool_con* ptr;
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if (!id) {
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LM_ERR("invalid parameter value\n");
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return 0;
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}
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ptr = db_pool;
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while (ptr) {
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if (cmp_db_id(id, ptr->id)) {
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ptr->ref++;
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return ptr;
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}
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ptr = ptr->next;
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}
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return 0;
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}
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/*
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* Insert a new connection into the pool
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*/
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void pool_insert(struct pool_con* con)
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{
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if (!con) return;
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con->next = db_pool;
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db_pool = con;
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}
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/*
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* Release connection from the pool, the function
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* would return 1 when if the connection is not
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* referenced anymore and thus can be closed and
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* deleted by the backend. The function returns
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* 0 if the connection should still be kept open
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* because some other module is still using it.
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* The function returns -1 if the connection is
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* not in the pool.
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*/
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int pool_remove(struct pool_con* con)
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{
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struct pool_con* ptr;
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if (!con) return -2;
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if (con->ref > 1) {
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/* There are still other users, just
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* decrease the reference count and return
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*/
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LM_DBG("connection still kept in the pool\n");
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con->ref--;
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return 0;
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}
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LM_DBG("removing connection from the pool\n");
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if (db_pool == con) {
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db_pool = db_pool->next;
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} else {
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ptr = db_pool;
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while(ptr) {
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if (ptr->next == con) break;
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ptr = ptr->next;
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}
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if (!ptr) {
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LM_ERR("weird, connection not found in the pool\n");
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return -1;
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} else {
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/* Remove the connection from the pool */
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ptr->next = con->next;
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}
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}
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return 1;
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}
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