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107 lines
2.6 KiB
107 lines
2.6 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file Worker.h
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#pragma once
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#include <string>
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#include <thread>
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#include <atomic>
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#include "Guards.h"
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namespace dev
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{
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enum class IfRunning
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{
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Fail,
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Join,
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Detach
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};
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enum class WorkerState
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{
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Starting,
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Started,
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Stopping,
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Stopped,
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Killing
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};
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class Worker
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{
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protected:
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Worker(std::string const& _name = "anon", unsigned _idleWaitMs = 30): m_name(_name), m_idleWaitMs(_idleWaitMs) {}
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/// Move-constructor.
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Worker(Worker&& _m) { std::swap(m_name, _m.m_name); }
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/// Move-assignment.
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Worker& operator=(Worker&& _m)
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{
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assert(&_m != this);
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std::swap(m_name, _m.m_name);
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return *this;
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}
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virtual ~Worker() { terminate(); }
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/// Allows changing worker name if work is stopped.
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void setName(std::string _n) { if (!isWorking()) m_name = _n; }
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/// Starts worker thread; causes startedWorking() to be called.
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void startWorking();
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/// Stop worker thread; causes call to stopWorking().
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void stopWorking();
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/// Returns if worker thread is present.
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bool isWorking() const { Guard l(x_work); return m_state == WorkerState::Started; }
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/// Called after thread is started from startWorking().
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virtual void startedWorking() {}
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/// Called continuously following sleep for m_idleWaitMs.
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virtual void doWork() {}
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/// Overrides doWork(); should call shouldStop() often and exit when true.
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virtual void workLoop();
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bool shouldStop() const { return m_state != WorkerState::Started; }
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/// Called when is to be stopped, just prior to thread being joined.
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virtual void doneWorking() {}
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/// Blocks caller into worker thread has finished.
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// void join() const { Guard l(x_work); try { if (m_work) m_work->join(); } catch (...) {} }
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private:
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/// Stop and never start again.
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void terminate();
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std::string m_name;
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unsigned m_idleWaitMs = 0;
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mutable Mutex x_work; ///< Lock for the network existance.
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std::unique_ptr<std::thread> m_work; ///< The network thread.
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std::atomic<WorkerState> m_state = {WorkerState::Starting};
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};
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}
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