mariadb-columnstore-engine/primitives/primproc/activestatementcounter.h

/* Copyright (C) 2014 InfiniDB, Inc.

   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 Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

// $Id: activestatementcounter.h 940 2013-01-21 14:11:31Z rdempsey $
//
/** @file */

#pragma once

#include <stdint.h>

#include <boost/thread/mutex.hpp>
#include <boost/thread/condition.hpp>

#include "vss.h"

class ActiveStatementCounter
{
 public:
  ActiveStatementCounter(uint32_t limit) : fStatementCount(0), upperLimit(limit), fStatementsWaiting(0)
  {
  }

  virtual ~ActiveStatementCounter()
  {
  }

  void incr(bool& counted);
  void decr(bool& counted);
  uint32_t cur() const
  {
    return fStatementCount;
  }
  uint32_t waiting() const
  {
    return fStatementsWaiting;
  }

 private:
  ActiveStatementCounter(const ActiveStatementCounter& rhs);
  ActiveStatementCounter& operator=(const ActiveStatementCounter& rhs);

  uint32_t fStatementCount;
  uint32_t upperLimit;
  uint32_t fStatementsWaiting;
  boost::mutex fMutex;
  boost::condition condvar;
  BRM::VSS fVss;
};