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/*
//
// Copyright 1997-2009 Torsten Rohlfing
//
// Copyright 2004-2011, 2013 SRI International
//
// This file is part of the Computational Morphometry Toolkit.
//
// http://www.nitrc.org/projects/cmtk/
//
// The Computational Morphometry Toolkit is free software: you can
// redistribute it and/or modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// The Computational Morphometry Toolkit is distributed in the hope that it
// will be useful, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with the Computational Morphometry Toolkit. If not, see
// <http://www.gnu.org/licenses/>.
//
// $Revision: 5436 $
//
// $LastChangedDate: 2018-12-10 19:01:20 -0800 (Mon, 10 Dec 2018) $
//
// $LastChangedBy: torstenrohlfing $
//
*/
#include "cmtkThreadPoolThreads.h"
#include <System/cmtkThreads.h>
#include <System/cmtkMutexLock.h>
#include <System/cmtkConsole.h>
/// This is the actual low-level thread function. It calls ThreadFunction() for the cmtk::ThreadPoolThreads instance given as the function parameter.
extern "C"
CMTK_THREAD_RETURN_TYPE
cmtkThreadPoolThreadFunction( CMTK_THREAD_ARG_TYPE arg )
{
static_cast<cmtk::ThreadPoolThreads::ThreadPoolThreadsArg*>( arg )->m_Pool->ThreadFunction( static_cast<cmtk::ThreadPoolThreads::ThreadPoolThreadsArg*>( arg )->m_Index );
return CMTK_THREAD_RETURN_VALUE;
}
namespace
cmtk
{
ThreadPoolThreads::ThreadPoolThreads( const size_t nThreads )
: m_NumberOfTasks( 0 ),
m_NextTaskIndex( 0 ),
m_TaskFunction( NULL ),
m_ThreadsRunning( false ),
m_ContinueThreads( true )
{
if ( ! nThreads )
this->m_NumberOfThreads = cmtk::Threads::GetNumberOfThreads();
else
this->m_NumberOfThreads = nThreads;
#ifdef CMTK_USE_SMP
this->m_ThreadID.resize( this->m_NumberOfThreads, 0 );
#ifdef _MSC_VER
this->m_ThreadHandles.resize( this->m_NumberOfThreads, 0 );
#endif
#endif
this->m_ThreadArgs.resize( this->m_NumberOfThreads );
}
void
ThreadPoolThreads::StartThreads()
{
if ( !this->m_ThreadsRunning )
{
#ifdef CMTK_USE_SMP
#ifdef CMTK_USE_PTHREADS
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
for ( size_t idx = 0; idx < this->m_NumberOfThreads; ++idx )
{
// set thread function arguments
this->m_ThreadArgs[idx].m_Pool = this;
this->m_ThreadArgs[idx].m_Index = idx;
// start thread
const int status = pthread_create( &this->m_ThreadID[idx], &attr, cmtkThreadPoolThreadFunction, static_cast<CMTK_THREAD_ARG_TYPE>( &this->m_ThreadArgs[idx] ) );
if ( status )
{
StdErr.printf( "Creation of pooled thread #%u failed with status %d.\n", idx, status );
exit( 1 );
}
}
pthread_attr_destroy(&attr);
#elif defined(_MSC_VER)
for ( size_t idx = 0; idx < this->m_NumberOfThreads; ++idx )
{
// set thread function arguments
this->m_ThreadArgs[idx].m_Pool = this;
this->m_ThreadArgs[idx].m_Index = idx;
// nothing happened yet, so set status to OK
int status = 0;
// start thread
this->m_ThreadHandles[idx] = CreateThread( NULL /*default security attributes*/, 0/*use default stack size*/, (LPTHREAD_START_ROUTINE) cmtkThreadPoolThreadFunction,
static_cast<CMTK_THREAD_ARG_TYPE>( &this->m_ThreadArgs[idx] ), 0/*use default creation flags*/, &this->m_ThreadID[idx] );
if ( this->m_ThreadHandles[idx] == NULL )
{
status = -1;
}
if ( status )
{
StdErr.printf( "Creation of pooled thread #%u failed with status %d.\n", idx, status );
exit( 1 );
}
}
#endif // #ifdef CMTK_USE_PTHREADS
#endif // #ifdef CMTK_USE_SMP
this->m_ThreadsRunning = true;
}
}
ThreadPoolThreads::~ThreadPoolThreads()
{
this->EndThreads();
}
void
ThreadPoolThreads::EndThreads()
{
if ( this->m_ThreadsRunning )
{
#ifdef CMTK_USE_PTHREADS
// set flag to terminate threads and post one semaphore per actual thread
this->m_ContinueThreads = false;
this->m_TaskWaitingSemaphore.Post( this->m_NumberOfThreads );
for ( size_t idx = 0; idx < this->m_NumberOfThreads; ++idx )
{
if ( this->m_ThreadID[idx] )
{
pthread_join( this->m_ThreadID[idx], NULL );
this->m_ThreadID[idx] = 0;
}
}
#elif defined(_MSC_VER)
for ( size_t idx = 0; idx < this->m_NumberOfThreads; ++idx )
{
DWORD resultThread = 0;
TerminateThread( this->m_ThreadHandles[idx], resultThread );
}
#endif
this->m_ThreadsRunning = false;
}
}
void
ThreadPoolThreads::ThreadFunction( const size_t threadIdx )
{
#ifdef _OPENMP
// Disable OpenMP inside thread
omp_set_num_threads( 1 );
#endif
#ifdef CMTK_USE_SMP
// wait for task waiting
this->m_TaskWaitingSemaphore.Wait();
while ( this->m_ContinueThreads )
{
// lock, get, increment next task index
this->m_NextTaskIndexLock.Lock();
const size_t taskIdx = this->m_NextTaskIndex;
++this->m_NextTaskIndex;
this->m_NextTaskIndexLock.Unlock();
// call task function
this->m_TaskFunction( this->m_TaskParameters[taskIdx], taskIdx, this->m_NumberOfTasks, threadIdx, this->m_NumberOfThreads );
// post "task done, thread waiting"
this->m_ThreadWaitingSemaphore.Post();
// wait for task waiting
this->m_TaskWaitingSemaphore.Wait();
}
#endif // #ifdef CMTK_USE_SMP
}
ThreadPoolThreads&
ThreadPoolThreads::GetGlobalThreadPool()
{
static ThreadPoolThreads globalThreadPoolThreads;
return globalThreadPoolThreads;
}
}
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