~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 include/usr0sess.h

Sessions

Created 6/25/1996 Heikki Tuuri

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

#ifndef usr0sess_h

#define usr0sess_h

#include "univ.i"

#include "ut0byte.h"

#include "trx0types.h"

#include "srv0srv.h"

#include "trx0types.h"

#include "usr0types.h"

#include "que0types.h"

#include "data0data.h"

#include "rem0rec.h"

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

Opens a session.

@return	own: session object */

UNIV_INTERN

sess_t*

sess_open(void);

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

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

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 */

/* The session handle. All fields are protected by the kernel mutex */

struct sess_struct{

	ulint		state;		/*!< state of the session */

	trx_t*		trx;		/*!< transaction object permanently

					assigned for the session: the

					transaction instance designated by the

					trx id changes, but the memory

					structure is preserved */

	UT_LIST_BASE_NODE_T(que_t)

			graphs;		/*!< query graphs belonging to this

					session */

};

/* Session states */

#define SESS_ACTIVE		1

#define SESS_ERROR		2	/* session contains an error message

					which has not yet been communicated

					to the client */

#ifndef UNIV_NONINL

#include "usr0sess.ic"

#endif

#endif