/usr/include/ITK-4.5/itkThreadedIteratorRangePartitioner.hxx is in libinsighttoolkit4-dev 4.5.0-3.
This file is owned by root:root, with mode 0o644.
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*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef __itkThreadedIteratorRangePartitioner_hxx
#define __itkThreadedIteratorRangePartitioner_hxx
#include "itkNumericTraits.h"
#include "itkThreadedIteratorRangePartitioner.h"
#include "itkMath.h"
namespace itk
{
template< typename TIterator >
ThreadedIteratorRangePartitioner< TIterator >
::ThreadedIteratorRangePartitioner()
{
}
template< typename TIterator >
ThreadedIteratorRangePartitioner< TIterator >
::~ThreadedIteratorRangePartitioner()
{
}
template< typename TIterator >
ThreadIdType
ThreadedIteratorRangePartitioner< TIterator >
::PartitionDomain( const ThreadIdType threadId,
const ThreadIdType requestedTotal,
const DomainType& completeDomain,
DomainType& subDomain ) const
{
// overallIndexRange is expected to be inclusive
// determine the actual number of pieces that will be generated
typename DomainType::IteratorType it;
ThreadIdType count = NumericTraits< ThreadIdType >::Zero;
for( it = completeDomain.Begin(); it != completeDomain.End(); ++it )
{
++count;
}
ThreadIdType valuesPerThread =
Math::Ceil<ThreadIdType>( static_cast< double >( count ) / static_cast< double >( requestedTotal ));
ThreadIdType maxThreadIdUsed =
Math::Ceil<ThreadIdType>( static_cast< double >( count ) / static_cast< double >( valuesPerThread )) - 1;
if ( threadId > maxThreadIdUsed )
{
// return before advancing Begin iterator, to prevent advancing
// past end
return maxThreadIdUsed + 1;
}
// Split the domain range
it = completeDomain.Begin();
const ThreadIdType startIndexCount = threadId * valuesPerThread;
for( ThreadIdType ii = 0; ii < startIndexCount; ++ii )
{
++it;
}
subDomain.m_Begin = it;
if (threadId < maxThreadIdUsed)
{
const ThreadIdType endIndexCount = valuesPerThread;
for( ThreadIdType ii = 0; ii < endIndexCount; ++ii )
{
++it;
}
subDomain.m_End = it;
}
if (threadId == maxThreadIdUsed)
{
// last thread needs to process the "rest" of the range
subDomain.m_End = completeDomain.End();
}
return maxThreadIdUsed + 1;
}
} // end namespace itk
#endif
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