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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.
*
*=========================================================================*/
#define ITK_LEGACY_TEST // so deprecation warnings are not triggered by this test
#include "itkPlatformMultiThreader.h"
namespace itkSTLThreadTestImpl
{
static int done = 0;
static int numberOfIterations = 10;
static std::mutex threadMutex;
static ITK_THREAD_RETURN_FUNCTION_CALL_CONVENTION
Runner(void *);
static int
Thread(int);
} // namespace itkSTLThreadTestImpl
int
itkSTLThreadTest(int argc, char * argv[])
{
// Choose a number of threads.
size_t numWorkUnits = 10;
if (argc > 1)
{
int nt = std::stoi(argv[1]);
if (nt > 1)
{
numWorkUnits = nt;
}
}
// Choose a number of iterations (0 is infinite).
if (argc > 2)
{
int ni = std::stoi(argv[2]);
if (ni >= 0)
{
itkSTLThreadTestImpl::numberOfIterations = ni;
}
}
// Enforce limit on number of threads.
if (numWorkUnits > itk::ITK_MAX_THREADS)
{
numWorkUnits = itk::ITK_MAX_THREADS;
}
// Report what we'll do.
std::cout << "Using " << numWorkUnits << " work units.\n";
if (itkSTLThreadTestImpl::numberOfIterations)
{
std::cout << "Using " << itkSTLThreadTestImpl::numberOfIterations << " iterations.\n";
}
else
{
std::cout << "Using infinite iterations.\n";
}
// Create result array. Assume failure.
auto * results = new int[numWorkUnits];
for (size_t i = 0; i < numWorkUnits; ++i)
{
results[i] = 0;
}
// Create and execute the threads.
itk::PlatformMultiThreader::Pointer threader = itk::PlatformMultiThreader::New();
threader->SetSingleMethod(itkSTLThreadTestImpl::Runner, results);
threader->SetNumberOfWorkUnits(numWorkUnits);
threader->SingleMethodExecute();
// Report results.
int result = 0;
for (size_t i = 0; i < numWorkUnits; ++i)
{
if (!results[i])
{
std::cerr << "Work unit " << i << " failed." << std::endl;
result = 1;
}
}
delete[] results;
// Test other methods for coverage.
std::cout << "Done with primary test. Testing more methods..." << std::endl;
itk::MultiThreaderBase::SetGlobalMaximumNumberOfThreads(1);
itk::MultiThreaderBase::SetGlobalDefaultNumberOfThreads(1);
std::cout << "itk::MultiThreaderBase::GetGlobalMaximumNumberOfThreads(): "
<< itk::MultiThreaderBase::GetGlobalMaximumNumberOfThreads() << std::endl;
#if !defined(ITK_LEGACY_REMOVE)
// test deprecated methods too!
itk::ThreadIdType threadId = threader->SpawnThread(itkSTLThreadTestImpl::Runner, nullptr);
itkSTLThreadTestImpl::threadMutex.lock();
std::cout << "SpawnThread(itkSTLThreadTestImpl::Runner, results): " << threadId << std::endl;
itkSTLThreadTestImpl::threadMutex.unlock();
threader->TerminateThread(threadId);
itkSTLThreadTestImpl::threadMutex.lock();
std::cout << "Spawned thread terminated." << std::endl;
itkSTLThreadTestImpl::threadMutex.unlock();
#endif
return result;
}
namespace itkSTLThreadTestImpl
{
static ITK_THREAD_RETURN_FUNCTION_CALL_CONVENTION
Runner(void * infoIn)
{
// Get the work unit id and result pointer and run the method for this work unit.
auto * info = static_cast<itk::PlatformMultiThreader::WorkUnitInfo *>(infoIn);
itk::ThreadIdType tnum = info->WorkUnitID;
auto * results = static_cast<int *>(info->UserData);
if (results)
{
results[tnum] = itkSTLThreadTestImpl::Thread(tnum);
}
else
{
itkSTLThreadTestImpl::Thread(tnum);
}
return ITK_THREAD_RETURN_DEFAULT_VALUE;
}
static int
Thread(int tnum)
{
// Implementation in individual thread. We don't care about
// mutexing the output because it doesn't matter for the test.
threadMutex.lock();
std::cout << "Starting " << tnum << '\n';
threadMutex.unlock();
// Create a list with which to play.
std::list<int> l;
// Choose a size for each iteration for this thread.
int count = 10000 + 100 * tnum;
int iteration = 0;
while (!done && !(numberOfIterations && (iteration >= numberOfIterations)))
{
// Output progress of this thread.
threadMutex.lock();
std::cout << tnum << ": " << iteration << '\n';
threadMutex.unlock();
// Fill the list.
int j;
for (j = 0; j < count; ++j)
{
l.push_back(j);
}
// Empty the list while making sure values match. Threading
// errors can cause mismatches here, which is the purpose of the
// test.
for (j = 0; j < count; ++j)
{
if (l.front() != j)
{
threadMutex.lock();
std::cerr << "Mismatch in thread " << tnum << "!\n";
done = 1;
threadMutex.unlock();
}
l.pop_front();
}
++iteration;
}
// Only get here on failure or iterations finished.
if (numberOfIterations && (iteration >= numberOfIterations))
{
// Success.
return EXIT_FAILURE;
}
else
{
// Failure.
return EXIT_SUCCESS;
}
}
} // namespace itkSTLThreadTestImpl
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