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/*
Copyright (C) 2012 - 2015 Andreas Baumann <mail@andreasbaumann.cc>
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef POOL_H
#define POOL_H
#include <sys/types.h> /* size_t */
#include <libpq-fe.h> /* for Postgresql database access */
#include <pthread.h> /* for mutex and conditionals */
typedef struct PgConnPool {
PGconn **conns; /* array of connections */
size_t size; /* max number of connections */
unsigned int *avail; /* status of slots */
pthread_t *thread; /* slots of allocated/available connections per thread */
pthread_mutex_t lock; /* monitor lock */
pthread_cond_t cond; /* condition signalling a free connection */
} PgConnPool;
int psql_pool_init( PgConnPool *pool, const char *conninfo, const size_t max_connections );
int psql_pool_destroy( PgConnPool *pool );
PGconn *psql_pool_acquire( PgConnPool *pool );
int psql_pool_release( PgConnPool *pool, PGconn *conn );
#endif
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