/usr/include/ITK-4.9/itkDomainThreader.hxx is in libinsighttoolkit4-dev 4.9.0-4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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 itkDomainThreader_hxx
#define itkDomainThreader_hxx
#include "itkDomainThreader.h"
namespace itk
{
template< typename TDomainPartitioner, typename TAssociate >
DomainThreader< TDomainPartitioner, TAssociate >
::DomainThreader()
{
this->m_DomainPartitioner = DomainPartitionerType::New();
this->m_MultiThreader = MultiThreader::New();
this->m_NumberOfThreadsUsed = 0;
this->m_Associate = ITK_NULLPTR;
}
template< typename TDomainPartitioner, typename TAssociate >
DomainThreader< TDomainPartitioner, TAssociate >
::~DomainThreader()
{
}
template< typename TDomainPartitioner, typename TAssociate >
MultiThreader *
DomainThreader< TDomainPartitioner, TAssociate >
::GetMultiThreader() const
{
return this->m_MultiThreader;
}
template< typename TDomainPartitioner, typename TAssociate >
ThreadIdType
DomainThreader< TDomainPartitioner, TAssociate >
::GetMaximumNumberOfThreads() const
{
return this->m_MultiThreader->GetNumberOfThreads();
}
template< typename TDomainPartitioner, typename TAssociate >
void
DomainThreader< TDomainPartitioner, TAssociate >
::SetMaximumNumberOfThreads( const ThreadIdType threads )
{
if( threads != this->GetMaximumNumberOfThreads() )
{
this->m_MultiThreader->SetNumberOfThreads( threads );
this->Modified();
}
}
template< typename TDomainPartitioner, typename TAssociate >
void
DomainThreader< TDomainPartitioner, TAssociate >
::Execute( TAssociate * enclosingClass, const DomainType & completeDomain )
{
this->m_Associate = enclosingClass;
this->m_CompleteDomain = completeDomain;
this->DetermineNumberOfThreadsUsed();
this->BeforeThreadedExecution();
// This calls ThreadedExecution in each thread.
this->StartThreadingSequence();
this->AfterThreadedExecution();
}
template< typename TDomainPartitioner, typename TAssociate >
void
DomainThreader< TDomainPartitioner, TAssociate >
::DetermineNumberOfThreadsUsed()
{
const ThreadIdType threaderNumberOfThreads = this->GetMultiThreader()->GetNumberOfThreads();
// Attempt a single dummy partition, just to get the number of subdomains actually created
DomainType subdomain;
this->m_NumberOfThreadsUsed = this->m_DomainPartitioner->PartitionDomain(0,
threaderNumberOfThreads,
this->m_CompleteDomain,
subdomain);
if( this->m_NumberOfThreadsUsed < threaderNumberOfThreads )
{
// If PartitionDomain is only able to create a lesser number of subdomains,
// ensure that superfluous threads aren't created
// DomainThreader::SetMaximumNumberOfThreads *should* already have been called by this point,
// but it's not fatal if it somehow gets called later
this->GetMultiThreader()->SetNumberOfThreads(this->m_NumberOfThreadsUsed);
}
else if( this->m_NumberOfThreadsUsed > threaderNumberOfThreads )
{
itkExceptionMacro( "A subclass of ThreadedDomainPartitioner::PartitionDomain"
<< "returned more subdomains than were requested" );
}
}
template< typename TDomainPartitioner, typename TAssociate >
void
DomainThreader< TDomainPartitioner, TAssociate >
::StartThreadingSequence()
{
// Set up the multithreaded processing
ThreadStruct str;
str.domainThreader = this;
MultiThreader* multiThreader = this->GetMultiThreader();
multiThreader->SetSingleMethod(this->ThreaderCallback, &str);
// multithread the execution
multiThreader->SingleMethodExecute();
}
template< typename TDomainPartitioner, typename TAssociate >
ITK_THREAD_RETURN_TYPE
DomainThreader< TDomainPartitioner, TAssociate >
::ThreaderCallback( void* arg )
{
MultiThreader::ThreadInfoStruct* info = static_cast<MultiThreader::ThreadInfoStruct *>(arg);
ThreadStruct *str = static_cast<ThreadStruct *>(info->UserData);
DomainThreader *thisDomainThreader = str->domainThreader;
const ThreadIdType threadId = info->ThreadID;
const ThreadIdType threadCount = info->NumberOfThreads;
// Get the sub-domain to process for this thread.
DomainType subdomain;
const ThreadIdType total = thisDomainThreader->GetDomainPartitioner()->PartitionDomain(threadId,
threadCount,
thisDomainThreader->m_CompleteDomain,
subdomain);
// Execute the actual method with appropriate sub-domain.
// If the threadId is greater than the total number of regions
// that PartitionDomain will create, don't use this thread.
// Sometimes the threads dont break up very well and it is just
// as efficient to leave a few threads idle.
if ( threadId < total )
{
thisDomainThreader->ThreadedExecution( subdomain, threadId );
}
return ITK_THREAD_RETURN_VALUE;
}
}
#endif
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