mariadb-columnstore-engine/dmlproc/dmlresultbuffer.cpp

/* 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: dmlresultbuffer.cpp 927 2013-01-21 14:11:25Z rdempsey $
 *
 *
 ***********************************************************************/
/** @file */

#include "dmlresultbuffer.h"

namespace dmlprocessor
{
DMLResultBuffer::DMLResultBuffer() : fBufferSize(1), fFull(0)
{
}

DMLResultBuffer::DMLResultBuffer(int bufferSize) : fBufferSize(bufferSize), fFull(0)
{
}

DMLResultBuffer::~DMLResultBuffer()
{
  fResultBuffer.clear();
}

void DMLResultBuffer::put(dmlpackageprocessor::DMLPackageProcessor::DMLResult result, int sessionID)
{
  scoped_lock lock(fMutex);

  if (fFull == fBufferSize)
  {
    while (fFull == fBufferSize)
      fCond.wait(lock);
  }

  ResultPair rp;
  rp.result = result;
  rp.sessionID = sessionID;

  fResultBuffer.push_back(rp);
  ++fFull;
  fCond.notify_one();
}

DMLResultBuffer::ResultPair DMLResultBuffer::get()
{
  scoped_lock lk(fMutex);

  if (fFull == 0)
  {
    while (fFull == 0)
      fCond.wait(lk);
  }

  ResultPair rp = fResultBuffer[0];
  fResultBuffer.pop_front();
  --fFull;
  fCond.notify_one();
  return rp;
}

}  // namespace dmlprocessor