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DefaultTaskScheduler.cpp
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DefaultTaskScheduler.cpp
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/******************************************************************************
* SOFA, Simulation Open-Framework Architecture *
* (c) 2006 INRIA, USTL, UJF, CNRS, MGH *
* *
* This program is free software; you can redistribute it and/or modify it *
* under the terms of the GNU Lesser General Public License as published by *
* the Free Software Foundation; either version 2.1 of the License, or (at *
* your option) any later version. *
* *
* This program 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 Lesser General Public License *
* for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
*******************************************************************************
* Authors: The SOFA Team and external contributors (see Authors.txt) *
* *
* Contact information: contact@sofa-framework.org *
******************************************************************************/
#include <sofa/simulation/DefaultTaskScheduler.h>
#include <sofa/helper/system/thread/thread_specific_ptr.h>
#include <sofa/simulation/WorkerThread.h>
#include <sofa/simulation/MainTaskSchedulerFactory.h>
namespace sofa::simulation
{
const bool DefaultTaskSchedulerRegistered = MainTaskSchedulerFactory::registerScheduler(
DefaultTaskScheduler::name(),
&DefaultTaskScheduler::create);
class StdTaskAllocator : public Task::Allocator
{
public:
void* allocate(std::size_t sz) final
{
return ::operator new(sz);
}
void free(void* ptr, std::size_t sz) final
{
SOFA_UNUSED(sz);
::operator delete(ptr);
}
};
DefaultTaskScheduler* DefaultTaskScheduler::create()
{
return new DefaultTaskScheduler();
}
DefaultTaskScheduler::DefaultTaskScheduler()
: TaskScheduler()
{
m_isInitialized = false;
m_threadCount = 0;
m_isClosing = false;
// init global static thread local var
{
_threads[std::this_thread::get_id()] = new WorkerThread(this, 0, "Main ");// new WorkerThread(this, 0, "Main ");
}
}
DefaultTaskScheduler::~DefaultTaskScheduler()
{
if ( m_isInitialized )
{
stop();
}
}
WorkerThread* DefaultTaskScheduler::getWorkerThread(const std::thread::id id)
{
const auto thread =_threads.find(id);
if (thread == _threads.end() )
{
return nullptr;
}
return thread->second;
}
Task::Allocator* DefaultTaskScheduler::getTaskAllocator()
{
static StdTaskAllocator defaultTaskAllocator;
return &defaultTaskAllocator;
}
void DefaultTaskScheduler::init(const unsigned int NbThread )
{
if ( m_isInitialized )
{
if ( (NbThread == m_threadCount) || (NbThread==0 && m_threadCount==GetHardwareThreadsCount()) )
{
return;
}
stop();
}
start(NbThread);
}
void DefaultTaskScheduler::start(const unsigned int NbThread )
{
stop();
m_isClosing = false;
m_workerThreadsIdle = true;
m_mainTaskStatus = nullptr;
// default number of thread: only physical cores. no advantage from hyperthreading.
m_threadCount = GetHardwareThreadsCount();
if ( NbThread > 0 )//&& NbThread <= MAX_THREADS )
{
m_threadCount = NbThread;
}
/* start worker threads */
for( unsigned int i=1; i<m_threadCount; ++i)
{
WorkerThread* thread = new WorkerThread(this, int(i));
thread->create_and_attach(this);
_threads[thread->getId()] = thread;
thread->start(this);
}
m_workerThreadCount = m_threadCount;
m_isInitialized = true;
}
void DefaultTaskScheduler::stop()
{
m_isClosing = true;
if ( m_isInitialized )
{
// wait for all
WaitForWorkersToBeReady();
wakeUpWorkers();
m_isInitialized = false;
for (auto [threadId, workerThread] : _threads)
{
// if this is the main thread continue
if (std::this_thread::get_id() == threadId)
{
continue;
}
// cpu busy wait
while (!workerThread->isFinished())
{
std::this_thread::yield();
std::this_thread::sleep_for(std::chrono::milliseconds(1));
}
// free memory
// cpu busy wait: thread.joint call
delete workerThread;
workerThread = nullptr;
}
m_threadCount = 1;
m_workerThreadCount = 1;
const auto mainThreadIt = _threads.find(std::this_thread::get_id());
WorkerThread* mainThread = mainThreadIt->second;
_threads.clear();
_threads[std::this_thread::get_id()] = mainThread;
}
return;
}
WorkerThread* DefaultTaskScheduler::getCurrent()
{
return getWorkerThread(std::this_thread::get_id());
}
const char* DefaultTaskScheduler::getCurrentThreadName()
{
const WorkerThread* thread = getCurrent();
return thread->getName();
}
int DefaultTaskScheduler::getCurrentThreadType()
{
const WorkerThread* thread = getCurrent();
return thread->getType();
}
bool DefaultTaskScheduler::addTask(Task* task)
{
WorkerThread* thread = getCurrent();
return thread->addTask(task);
}
void DefaultTaskScheduler::workUntilDone(Task::Status* status)
{
WorkerThread* thread = getCurrent();
thread->workUntilDone(status);
}
void DefaultTaskScheduler::wakeUpWorkers()
{
{
std::lock_guard guard(m_wakeUpMutex);
m_workerThreadsIdle = false;
}
m_wakeUpEvent.notify_all();
}
void DefaultTaskScheduler::WaitForWorkersToBeReady()
{
m_workerThreadsIdle = true;
}
void DefaultTaskScheduler::setMainTaskStatus(const Task::Status* mainTaskStatus)
{
m_mainTaskStatus.store(mainTaskStatus, std::memory_order::memory_order_relaxed);
}
bool DefaultTaskScheduler::testMainTaskStatus(const Task::Status* status)
{
return m_mainTaskStatus.load(std::memory_order::memory_order_relaxed) == status;
}
} // namespace sofa::simulation