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/* -*- mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2009 Sun Microsystems
*
* 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
*/
#ifndef PLUGIN_POOL_OF_THREADS_POOL_OF_THREADS_H
#define PLUGIN_POOL_OF_THREADS_POOL_OF_THREADS_H
#include <drizzled/gettext.h>
#include <drizzled/error.h>
#include <drizzled/plugin/scheduler.h>
#include <drizzled/sql_parse.h>
#include <drizzled/session.h>
#include <drizzled/plugin/client.h>
#include "session_scheduler.h"
#include <string>
#include <queue>
#include <set>
#include <event.h>
/**
* @brief
* Derived class for pool of threads scheduler.
*/
class PoolOfThreadsScheduler: public drizzled::plugin::Scheduler
{
private:
pthread_attr_t attr;
pthread_mutex_t LOCK_session_add; /* protects sessions_need_adding */
pthread_mutex_t LOCK_session_kill; /* protects sessions_to_be_killed */
/**
* LOCK_event_loop protects the non-thread safe libevent calls (event_add
* and event_del) and sessions_need_processing and sessions_waiting_for_io.
*/
pthread_mutex_t LOCK_event_loop;
std::queue<Session *> sessions_need_adding; /* queue of sessions to add to libevent queue */
std::queue<Session *> sessions_to_be_killed; /* queue of sessions to be killed */
std::queue<Session *> sessions_need_processing; /* queue of sessions that needs some processing */
/**
* Collection of sessions with added events
*
* This should really be a collection of unordered Sessions. No one is more
* promising to encounter an io event earlier than another; so no order
* indeed! We will change this to unordered_set/hash_set when c++0x comes.
*/
std::set<Session *> sessions_waiting_for_io;
public:
PoolOfThreadsScheduler(const char *name_arg);
~PoolOfThreadsScheduler();
/**
* @brief
* Notify the thread pool about a new connection
*
* @param[in] the newly connected session
*
* @return
* True if there is an error.
*/
bool addSession(Session *session);
/**
* @brief
* Signal a waiting connection it's time to die.
*
* @details
* This function will signal libevent the Session should be killed.
*
* @param[in] session The connection to kill
*/
void killSession(Session *session);
/**
* @brief
* Create all threads for the thread pool
*
* @details
* After threads are created we wait until all threads has signaled that
* they have started before we return
*
* @retval 0 Ok
* @retval 1 We got an error creating the thread pool. In this case we will abort all created threads.
*/
bool libevent_init(void);
void doIO(session_scheduler *sched);
void killSession(int Fd);
void addSession(int Fd);
pthread_handler_t mainLoop();
void sessionAddToQueue(session_scheduler *sched);
};
#endif /* PLUGIN_POOL_OF_THREADS_POOL_OF_THREADS_H */
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