~drizzle-trunk/drizzle/development

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

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., 59 Temple

Place, Suite 330, Boston, MA 02111-1307 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"

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

Closes a session, freeing the memory occupied by it. */

static

void

sess_close(

/*=======*/

	sess_t*		sess);	/*!< in, own: session object */

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

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. */

static

void

sess_close(

/*=======*/

	sess_t*	sess)	/*!< in, own: session object */

{

	ut_ad(mutex_own(&kernel_mutex));

	ut_ad(sess->trx == NULL);

	mem_free(sess);

}

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

Closes a session, freeing the memory occupied by it, if it is in a state

where it should be closed.

@return	TRUE if closed */

UNIV_INTERN

ibool

sess_try_close(

/*===========*/

	sess_t*	sess)	/*!< in, own: session object */

{

	ut_ad(mutex_own(&kernel_mutex));

	if (UT_LIST_GET_LEN(sess->graphs) == 0) {

		sess_close(sess);

		return(TRUE);

	}

	return(FALSE);

}