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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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.
*
*=========================================================================*/
#include "itkBarrier.h"
#include "itkMultiThreaderBase.h"
#include "itkTestingMacros.h"
class BarrierTestUserData
{
public:
itk::Barrier::Pointer m_FirstBarrier;
itk::Barrier::Pointer m_SecondBarrier;
unsigned int m_Counter[itk::ITK_MAX_THREADS];
unsigned int m_NumberOfIterations;
unsigned int m_NumberOfWorkUnits;
bool m_TestFailure;
BarrierTestUserData(unsigned int number_of_threads)
{
m_TestFailure = false;
m_NumberOfWorkUnits = number_of_threads;
for (unsigned int i = 0; i < number_of_threads - 1; ++i)
{
m_Counter[i] = 0;
}
m_NumberOfIterations = 50;
m_FirstBarrier = itk::Barrier::New();
m_SecondBarrier = itk::Barrier::New();
m_FirstBarrier->Initialize(number_of_threads);
m_SecondBarrier->Initialize(number_of_threads);
}
~BarrierTestUserData() = default;
};
ITK_THREAD_RETURN_FUNCTION_CALL_CONVENTION
BarrierTestIncrement(void * ptr)
{
itk::ThreadIdType threadId = ((itk::MultiThreaderBase::WorkUnitInfo *)(ptr))->WorkUnitID;
auto * data = static_cast<BarrierTestUserData *>(((itk::MultiThreaderBase::WorkUnitInfo *)(ptr))->UserData);
for (unsigned int i = 0; i < data->m_NumberOfIterations; ++i)
{
// set the value for this iteration
data->m_Counter[threadId] = i;
// wait for all the other threads
data->m_FirstBarrier->Wait();
data->m_SecondBarrier->Wait();
}
return ITK_THREAD_RETURN_DEFAULT_VALUE;
}
ITK_THREAD_RETURN_FUNCTION_CALL_CONVENTION
BarrierCheckIncrement(void * ptr)
{
auto * data = static_cast<BarrierTestUserData *>(((itk::MultiThreaderBase::WorkUnitInfo *)(ptr))->UserData);
for (unsigned int i = 0; i < data->m_NumberOfIterations; ++i)
{
// Wait for other threads to populate the m_Counter array
data->m_FirstBarrier->Wait();
// Check the values in the m_Counter array
for (unsigned int j = 0; j < data->m_NumberOfWorkUnits - 1; ++j)
{
if (data->m_Counter[j] != i)
{
data->m_TestFailure = true;
}
}
data->m_SecondBarrier->Wait();
}
return ITK_THREAD_RETURN_DEFAULT_VALUE;
}
ITK_THREAD_RETURN_FUNCTION_CALL_CONVENTION
BarrierTestCallback(void * ptr)
{
itk::ThreadIdType threadId = ((itk::MultiThreaderBase::WorkUnitInfo *)(ptr))->WorkUnitID;
auto * data = static_cast<BarrierTestUserData *>(((itk::MultiThreaderBase::WorkUnitInfo *)(ptr))->UserData);
if (threadId == data->m_NumberOfWorkUnits - 1)
{
BarrierCheckIncrement(ptr);
}
else
{
BarrierTestIncrement(ptr);
}
return ITK_THREAD_RETURN_DEFAULT_VALUE;
}
ITK_THREAD_RETURN_FUNCTION_CALL_CONVENTION
BarrierSpecialTest(void * ptr)
{
auto * data = static_cast<BarrierTestUserData *>(((itk::MultiThreaderBase::WorkUnitInfo *)(ptr))->UserData);
for (unsigned int j = 0; j < 1000; ++j)
{
data->m_FirstBarrier->Wait();
}
return ITK_THREAD_RETURN_DEFAULT_VALUE;
}
int
itkBarrierTest(int argc, char * argv[])
{
itk::Barrier::Pointer barrier = itk::Barrier::New();
ITK_EXERCISE_BASIC_OBJECT_METHODS(barrier, Barrier, LightObject);
itk::ThreadIdType number_of_threads = 4;
if (argc > 1)
{
number_of_threads = std::stoi(argv[1]);
}
BarrierTestUserData data(number_of_threads);
try
{
itk::MultiThreaderBase::Pointer multithreader = itk::MultiThreaderBase::New();
multithreader->SetMaximumNumberOfThreads(number_of_threads);
if (multithreader->GetMaximumNumberOfThreads() < number_of_threads)
{
std::cerr << "Could not increase number of threads to " << number_of_threads << " in "
<< multithreader->GetNameOfClass() << std::endl;
return EXIT_FAILURE;
}
multithreader->SetNumberOfWorkUnits(number_of_threads);
multithreader->SetSingleMethod(BarrierTestCallback, &data);
for (unsigned int i = 0; i < 5; ++i) // repeat test 5 times
{
multithreader->SingleMethodExecute();
}
// perform another test
multithreader->SetSingleMethod(BarrierSpecialTest, &data);
multithreader->SingleMethodExecute();
}
catch (const itk::ExceptionObject & e)
{
std::cerr << e << std::endl;
return EXIT_FAILURE;
}
if (data.m_TestFailure == false)
{
std::cout << "[TEST PASSED]" << std::endl;
return EXIT_SUCCESS;
}
else
{
std::cout << "[TEST FAILED]" << std::endl;
return 2;
}
}
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