cpp-ethereum/libdevcore/Worker.cpp at develop · cheny56/cpp-ethereum · GitHub

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This file is part of cpp-ethereum.

cpp-ethereum 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.

cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.

/** @file Worker.cpp

* @author Gav Wood <i@gavwood.com>

* @date 2014

#include "Worker.h"

#include <chrono>

#include <thread>

#include "Log.h"

using namespace std;

using namespace dev;

void Worker::startWorking()

{

// cnote << "startWorking for thread" << m_name;

std::unique_lock<std::mutex> l(x_work);

if (m_work)

{

WorkerState ex = WorkerState::Stopped;

m_state.compare_exchange_strong(ex, WorkerState::Starting);

m_state_notifier.notify_all();

}

else

{

m_state = WorkerState::Starting;

m_state_notifier.notify_all();

m_work.reset(new thread([&]()

{

setThreadName(m_name.c_str());

// cnote << "Thread begins";

while (m_state != WorkerState::Killing)

{

WorkerState ex = WorkerState::Starting;

{

// the condition variable-related lock

unique_lock<mutex> l(x_work);

m_state = WorkerState::Started;

}

// cnote << "Trying to set Started: Thread was" << (unsigned)ex << "; " << ok;

m_state_notifier.notify_all();

try

{

startedWorking();

workLoop();

doneWorking();

}

catch (std::exception const& _e)

{

clog(WarnChannel) << "Exception thrown in Worker thread: " << _e.what();

}

// ex = WorkerState::Stopping;

// m_state.compare_exchange_strong(ex, WorkerState::Stopped);

{

// the condition variable-related lock

unique_lock<mutex> l(x_work);

ex = m_state.exchange(WorkerState::Stopped);

// cnote << "State: Stopped: Thread was" << (unsigned)ex;

if (ex == WorkerState::Killing || ex == WorkerState::Starting)

m_state.exchange(ex);

}

m_state_notifier.notify_all();

// cnote << "Waiting until not Stopped...";

{

unique_lock<mutex> l(x_work);

DEV_TIMED_ABOVE("Worker stopping", 100)

while (m_state == WorkerState::Stopped)

m_state_notifier.wait(l);

}

}));

// cnote << "Spawning" << m_name;

}

DEV_TIMED_ABOVE("Start worker", 100)

while (m_state == WorkerState::Starting)

m_state_notifier.wait(l);

}

void Worker::stopWorking()

{

std::unique_lock<Mutex> l(x_work);

if (m_work)

{

WorkerState ex = WorkerState::Started;

if (!m_state.compare_exchange_strong(ex, WorkerState::Stopping))

return;

m_state_notifier.notify_all();

DEV_TIMED_ABOVE("Stop worker", 100)

while (m_state != WorkerState::Stopped)

m_state_notifier.wait(l); // but yes who can wake this up, when the mutex is taken.

}

void Worker::terminate()

{

// cnote << "stopWorking for thread" << m_name;

std::unique_lock<Mutex> l(x_work);

if (m_work)

{

if (m_state.exchange(WorkerState::Killing) == WorkerState::Killing)

return; // Somebody else is doing this

l.unlock();

m_state_notifier.notify_all();

DEV_TIMED_ABOVE("Terminate worker", 100)

m_work->join();

l.lock();

m_work.reset();

}

void Worker::workLoop()

{

while (m_state == WorkerState::Started)

{

if (m_idleWaitMs)

this_thread::sleep_for(chrono::milliseconds(m_idleWaitMs));

doWork();

}

cpp-ethereum/libdevcore/Worker.cpp at develop · cheny56/cpp-ethereum · GitHub

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