/*****************************************************************************

Copyright (c) 1996, 2009, Innobase Oy. All Rights Reserved.

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; version 2 of the License.

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 St, Fifth Floor, Boston, MA 02110-1301 USA

*****************************************************************************/

/**************************************************//**
@file usr/usr0sess.c
Sessions

Created 6/25/1996 Heikki Tuuri
*******************************************************/

#include "usr0sess.h"

#ifdef UNIV_NONINL
#include "usr0sess.ic"
#endif

#include "trx0trx.h"

/*********************************************************************//**
Opens a session.
@return	own: session object */
UNIV_INTERN
sess_t*
sess_open(void)
/*===========*/
{
	sess_t*	sess;

	ut_ad(mutex_own(&kernel_mutex));

	sess = mem_alloc(sizeof(sess_t));

	sess->state = SESS_ACTIVE;

	sess->trx = trx_create(sess);

	UT_LIST_INIT(sess->graphs);

	return(sess);
}

/*********************************************************************//**
Closes a session, freeing the memory occupied by it. */
UNIV_INTERN
void
sess_close(
/*=======*/
	sess_t*	sess)	/*!< in, own: session object */
{
	ut_ad(!mutex_own(&kernel_mutex));

	ut_a(UT_LIST_GET_LEN(sess->graphs) == 0);

	trx_free_for_background(sess->trx);
	mem_free(sess);
}