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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.
*
*=========================================================================*/
#include <iostream>
#include "itkTimeStamp.h"
#include "itkMultiThreader.h"
// A helper struct for the test, the idea is to have one timestamp per thread.
// To ease the writing of the test, we use MultiThreader::SingleMethodExecute
// with an array of timestamps in the shared data
typedef struct {
std::vector<itk::TimeStamp> timestamps;
std::vector<unsigned long> counters;
} TimeStampTestHelper;
ITK_THREAD_RETURN_TYPE modified_function( void *ptr )
{
typedef itk::MultiThreader::ThreadInfoStruct ThreadInfoType;
ThreadInfoType * infoStruct = static_cast< ThreadInfoType * >( ptr );
const itk::ThreadIdType threadId = infoStruct->ThreadID;
TimeStampTestHelper * helper =
static_cast< TimeStampTestHelper * >( infoStruct->UserData );
helper->timestamps[threadId].Modified();
helper->counters[threadId]++;
return ITK_THREAD_RETURN_VALUE;
}
int itkTimeStampTest(int, char*[])
{
bool success = true;
try
{
TimeStampTestHelper helper;
// Set up the multithreader
itk::MultiThreader::Pointer multithreader = itk::MultiThreader::New();
multithreader->SetNumberOfThreads( ITK_MAX_THREADS+10 );// this will be clamped
multithreader->SetSingleMethod( modified_function, &helper);
// Test that the number of threads has actually been clamped
const itk::ThreadIdType numberOfThreads = multithreader->GetNumberOfThreads();
if( numberOfThreads > ITK_MAX_THREADS )
{
std::cerr << "[TEST FAILED]" << std::endl;
std::cerr << "numberOfThreads > ITK_MAX_THREADS" << std::endl;
return EXIT_FAILURE;
}
// Set up the helper class
helper.counters.resize( numberOfThreads );
helper.timestamps.resize( numberOfThreads );
for(itk::ThreadIdType k=0; k < numberOfThreads; k++)
{
helper.counters[k] = 0;
}
// Declare an array to test whether the all modified times have
// been used
std::vector<bool> istimestamped( numberOfThreads );
// Call Modified once on any object to make it up-to-date
multithreader->Modified();
const itk::ModifiedTimeType init_mtime = multithreader->GetMTime();
std::cout << "init_mtime: " << init_mtime << std::endl;
itk::ModifiedTimeType prev_mtime = init_mtime;
const unsigned int num_exp = 500;
for( unsigned int i = 0; i < num_exp; i++ )
{
multithreader->SingleMethodExecute();
itk::ModifiedTimeType min_mtime = helper.timestamps[0].GetMTime();
itk::ModifiedTimeType max_mtime = helper.timestamps[0].GetMTime();
for(itk::ThreadIdType k=0; k < numberOfThreads; k++)
{
const itk::ModifiedTimeType & mtime = helper.timestamps[k].GetMTime();
if ( mtime > max_mtime )
{
max_mtime = mtime;
}
else if ( mtime < min_mtime )
{
min_mtime = mtime;
}
// initialiaze the array to false
istimestamped[k]=false;
}
bool iter_success =
( ((max_mtime-prev_mtime ) == numberOfThreads) &&
(min_mtime==prev_mtime+1) );
if ( iter_success )
{
for(itk::ThreadIdType k=0; k < numberOfThreads; k++)
{
// Test whether the all modified times have
// been used
const itk::ModifiedTimeType index = helper.timestamps[k].GetMTime()-min_mtime;
if ( istimestamped[index] == true )
{
iter_success = false;
std::cerr<<helper.timestamps[k].GetMTime()<<" was used twice as a timestamp!"<<std::endl;
}
else
{
istimestamped[index] = true;
}
// Test the counters
if( helper.counters[k] != i+1 )
{
iter_success = false;
std::cerr << "counter[" << k << "] = " << helper.counters[k];
std::cerr << " at iteration " << i << std::endl;
}
}
}
if( !iter_success )
{
std::cerr << "[Iteration " << i << " FAILED]" << std::endl;
std::cerr << "max_mtime : " << max_mtime << std::endl;
std::cerr << "min_mtime : " << min_mtime << std::endl;
std::cerr << "prev_mtime : " << prev_mtime << std::endl;
std::cerr << "num_threads : " << numberOfThreads << std::endl;
std::cerr << "max - prev mtime: " << max_mtime - prev_mtime << std::endl;
std::cerr << std::endl;
success = false;
// Note that in a more general setting, (max_mtime-prev_mtime)>numberOfThreads
// might be a normal case since the modified time of a time stamp
// is global. If a new itk object is created this will also increment
// the time. In our specific test, there's no reason for another ITK object to be
// modified though
}
prev_mtime = max_mtime;
}
}
catch (itk::ExceptionObject &e)
{
std::cerr << "[TEST FAILED]" << std::endl;
std::cerr << "Exception caught: "<< e << std::endl;
return EXIT_FAILURE;
}
if (!success)
{
std::cerr << "[TEST FAILED]" << std::endl;
return EXIT_FAILURE;
}
std::cout << "[TEST PASSED]" << std::endl;
return EXIT_SUCCESS;
}
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