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/*******************************************************************************
* statistics.cpp
*
* ---------------------------------------------------------------------------
* Persistence of Vision Ray Tracer ('POV-Ray') version 3.7.
* Copyright 1991-2013 Persistence of Vision Raytracer Pty. Ltd.
*
* POV-Ray is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* POV-Ray 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* ---------------------------------------------------------------------------
* POV-Ray is based on the popular DKB raytracer version 2.12.
* DKBTrace was originally written by David K. Buck.
* DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
* ---------------------------------------------------------------------------
* $File: //depot/public/povray/3.x/source/backend/support/statistics.cpp $
* $Revision: #1 $
* $Change: 6069 $
* $DateTime: 2013/11/06 11:59:40 $
* $Author: chrisc $
*******************************************************************************/
#include <vector>
#include <cassert>
// frame.h must always be the first POV file included (pulls in platform config)
#include "backend/frame.h"
#include "base/types.h"
#include "backend/support/statistics.h"
// this must be the last file included
#include "base/povdebug.h"
namespace pov
{
const unsigned int kMaxReadAttempts = 10;
template <typename T>
bool Counter<T>::SafeRead(unsigned int maxattempts, T *result) const
{
// Use pointers to the value because even though it is declared
// as volatile, we cannot trust all compilers enough to not
// optimize the accesses!
const volatile T *p1 = &value;
const volatile T *p2 = &value;
do
{
T val1 = *p1;
T val2 = *p2;
if (val2 == val1)
{
*result = val2;
return true;
}
} while (maxattempts--);
return false;
}
template <typename T, int numElem>
void StatisticsBase<T, numElem>::operator+=(const StatisticsBase<T, numElem>& other)
{
for (int i = 0; i < numElem; i++)
{
T temp;
other.counters[i].SafeRead(kMaxReadAttempts, &temp);
counters[i] += temp;
}
}
template <typename T, int numElem>
StatisticsBase<T, numElem> StatisticsBase<T, numElem>::operator+(const StatisticsBase<T, numElem>& other)
{
StatisticsBase<T, numElem> result(*this);
result += other;
return result;
}
template <typename T, int numElem>
void StatisticsBase<T, numElem>::clear()
{
for (int i = 0; i < numElem; i++)
counters[i] = 0; // assumes this is a valid operation for type T
}
template class StatisticsBase<POV_ULONG, MaxIntStat>;
template class StatisticsBase<double, MaxFPStat>;
}
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