f74f67540f
reworked the reference count mechanism on the session. Introduced a FREE state for the session and alter the session destruction flow so that we only remove the session when all the DCB's have singled they have finished processing events for the DCB rather than when the first thread decides to clsoe the DCB.
93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
#ifndef _SESSION_H
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#define _SESSION_H
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/*
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* This file is distributed as part of the SkySQL Gateway. It is free
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* software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation,
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* version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright SkySQL Ab 2013
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*/
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/**
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* @file session.h
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 01-06-2013 Mark Riddoch Initial implementation
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* 14-06-2013 Massimiliano Pinto Added void *data to session
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* for session specific data
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* 01-07-2013 Massimiliano Pinto Removed backends pointer
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* from struct session
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* 02-09-2013 Massimiliano Pinto Added session ref counter
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*
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* @endverbatim
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*/
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#include <time.h>
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#include <atomic.h>
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#include <spinlock.h>
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#include <skygw_utils.h>
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struct dcb;
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struct service;
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/**
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* The session statistics structure
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*/
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typedef struct {
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time_t connect; /**< Time when the session was started */
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} SESSION_STATS;
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typedef enum {
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SESSION_STATE_ALLOC,
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SESSION_STATE_READY,
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SESSION_STATE_LISTENER,
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SESSION_STATE_LISTENER_STOPPED,
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SESSION_STATE_FREE
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} session_state_t;
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/**
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* The session status block
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*
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* A session status block is created for each user (client) connection
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* to the database, it links the descriptors, routing implementation
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* and originating service together for the client session.
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*/
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typedef struct session {
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skygw_chk_t ses_chk_top;
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SPINLOCK ses_lock;
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session_state_t state; /**< Current descriptor state */
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struct dcb *client; /**< The client connection */
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struct dcb *backends; /**< The set of backend servers */
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void *data; /**< The session data */
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void *router_session;/**< The router instance data */
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SESSION_STATS stats; /**< Session statistics */
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struct service *service; /**< The service this session is using */
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struct session *next; /**< Linked list of all sessions */
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int refcount; /**< Reference count on the session */
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skygw_chk_t ses_chk_tail;
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} SESSION;
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#define SESSION_PROTOCOL(x, type) DCB_PROTOCOL((x)->client, type)
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extern SESSION *session_alloc(struct service *, struct dcb *);
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extern void session_free(SESSION *);
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extern void printAllSessions();
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extern void printSession(SESSION *);
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extern void dprintAllSessions(struct dcb *);
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extern void dprintSession(struct dcb *, SESSION *);
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extern char *session_state(int);
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extern bool session_link_dcb(SESSION *, struct dcb *);
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#endif
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