~drizzle-trunk/drizzle/development

/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2010 Brian Aker

 *

 *  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; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  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

 */

#include <boost/thread/mutex.hpp>

#include <boost/thread/condition_variable.hpp>

#include <boost/unordered_map.hpp>

#include <boost/logic/tribool.hpp>

#include <boost/unordered/unordered_set.hpp>

#include <string>

#include "drizzled/session.h"

#include "drizzled/util/string.h"

#ifndef PLUGIN_USER_LOCKS_LOCKS_H

#define PLUGIN_USER_LOCKS_LOCKS_H

namespace user_locks {

const size_t LARGEST_LOCK_NAME= 64;

class Locks

{

public:

  struct lock_st {

    drizzled::session_id_t id;

    lock_st(drizzled::session_id_t id_arg) :

      id(id_arg)

    {

    }

  };

  typedef boost::shared_ptr<lock_st> lock_st_ptr;

  typedef boost::unordered_map<user_locks::Key, lock_st_ptr> LockMap;

  static Locks &getInstance(void)

  {

    static Locks instance;

    return instance;

  }

  bool lock(drizzled::session_id_t id_arg, const user_locks::Key &arg);

  bool lock(drizzled::session_id_t id_arg, const user_locks::Key &arg, int64_t wait_for= 0);

  bool lock(drizzled::session_id_t id_arg, const user_locks::Keys &arg);

  boost::tribool release(const user_locks::Key &arg, drizzled::session_id_t &id_arg);

  bool isFree(const user_locks::Key &arg);

  bool isUsed(const user_locks::Key &arg, drizzled::session_id_t &id_arg);

  void Copy(LockMap &lock_map);

private:

  boost::mutex mutex;

  boost::condition_variable cond;

  LockMap lock_map; 

};

} /* namespace user_locks */

#endif /* PLUGIN_USER_LOCKS_LOCKS_H */