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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 <iostream>
#include "itkConditionVariable.h"
#include "itkPlatformMultiThreader.h"
class ConditionVariableTestUserData
{
public:
itk::SimpleMutexLock m_Mutex;
itk::ConditionVariable::Pointer m_ConditionVariable;
unsigned int m_Counter;
unsigned int m_CountLimit;
ConditionVariableTestUserData()
{
m_ConditionVariable = itk::ConditionVariable::New();
m_Counter = 0;
m_CountLimit = 12;
}
~ConditionVariableTestUserData() = default;
};
ITK_THREAD_RETURN_FUNCTION_CALL_CONVENTION
ConditionVariableTestIncCount(void * ptr)
{
auto * data = static_cast<ConditionVariableTestUserData *>(((itk::MultiThreaderBase::WorkUnitInfo *)(ptr))->UserData);
double v = 400.0;
for (unsigned int i = 0; i < 10; ++i)
{
data->m_Mutex.Lock();
data->m_Counter++;
// Check the value of count. If the condition has been reached, signal
// waiting threads.
if (data->m_Counter == data->m_CountLimit)
{
// data->m_ConditionVariable->Signal();
// Tests both Broadcast and Signal
data->m_ConditionVariable->Broadcast();
}
data->m_Mutex.Unlock();
// Do some work here.
for (unsigned int j = 0; j < 1000; ++j)
{
v = v / 2.4;
v = v * 2.4;
}
}
return ITK_THREAD_RETURN_DEFAULT_VALUE;
}
ITK_THREAD_RETURN_FUNCTION_CALL_CONVENTION
ConditionVariableTestWatchCount(void * ptr)
{
auto * data = static_cast<ConditionVariableTestUserData *>(((itk::MultiThreaderBase::WorkUnitInfo *)(ptr))->UserData);
// Lock the mutex and wait for the signal.
data->m_Mutex.Lock();
while (data->m_Counter < data->m_CountLimit)
{
data->m_ConditionVariable->Wait(&data->m_Mutex);
}
data->m_Mutex.Unlock();
return ITK_THREAD_RETURN_DEFAULT_VALUE;
}
ITK_THREAD_RETURN_FUNCTION_CALL_CONVENTION
ConditionVariableTestCallback(void * ptr)
{
itk::ThreadIdType threadId = ((itk::MultiThreaderBase::WorkUnitInfo *)(ptr))->WorkUnitID;
if (threadId == 0)
{
ConditionVariableTestWatchCount(ptr);
}
else
{
ConditionVariableTestIncCount(ptr);
}
return ITK_THREAD_RETURN_DEFAULT_VALUE;
}
int
itkConditionVariableTest(int, char *[])
{
ConditionVariableTestUserData cond;
try
{
itk::PlatformMultiThreader::Pointer multithreader = itk::PlatformMultiThreader::New();
multithreader->SetNumberOfWorkUnits(3);
multithreader->SetSingleMethod(ConditionVariableTestCallback, &cond);
for (unsigned int i = 0; i < 1000; ++i)
{
cond.m_Counter = 0;
multithreader->SingleMethodExecute();
}
}
catch (const itk::ExceptionObject & e)
{
std::cerr << e << std::endl;
return 2;
}
std::cout << "[TEST PASSED]" << std::endl;
return EXIT_SUCCESS;
}
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