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Diffstat (limited to 'pool.h')
-rw-r--r-- | pool.h | 43 |
1 files changed, 43 insertions, 0 deletions
@@ -0,0 +1,43 @@ +/* + Copyright (C) 2012 Andreas Baumann <abaumann@yahoo.com> + + 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 */ + pid_t *avail; /* 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, pid_t pid ); + +int psql_pool_release( PgConnPool *pool, pid_t pid ); + +#endif |