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loopscheduler.h
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128 lines (110 loc) · 3.48 KB
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/*******************************************************************************
* CLI - A simple command line interface.
* Copyright (C) 2016-2021 Daniele Pallastrelli
*
* Boost Software License - Version 1.0 - August 17th, 2003
*
* Permission is hereby granted, free of charge, to any person or organization
* obtaining a copy of the software and accompanying documentation covered by
* this license (the "Software") to use, reproduce, display, distribute,
* execute, and transmit the Software, and to prepare derivative works of the
* Software, and to permit third-parties to whom the Software is furnished to
* do so, all subject to the following:
*
* The copyright notices in the Software and this entire statement, including
* the above license grant, this restriction and the following disclaimer,
* must be included in all copies of the Software, in whole or in part, and
* all derivative works of the Software, unless such copies or derivative
* works are solely in the form of machine-executable object code generated by
* a source language processor.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
* SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
* FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
******************************************************************************/
#ifndef CLI_LOOPSCHEDULER_H_
#define CLI_LOOPSCHEDULER_H_
#include <queue>
#include <thread>
#include <mutex>
#include <condition_variable>
#include "scheduler.h"
namespace cli
{
/**
* @brief The LoopScheduler is a simple thread-safe scheduler
*
*/
class LoopScheduler : public Scheduler
{
public:
LoopScheduler() = default;
~LoopScheduler() override
{
Stop();
}
// non copyable
LoopScheduler(const LoopScheduler&) = delete;
LoopScheduler& operator=(const LoopScheduler&) = delete;
void Stop()
{
std::lock_guard<std::mutex> lck (mtx);
running = false;
cv.notify_all();
}
void Run()
{
while( ExecOne() ) {};
}
bool Stopped() const
{
std::lock_guard<std::mutex> lck (mtx);
return !running;
}
void Post(const std::function<void()>& f) override
{
std::lock_guard<std::mutex> lck (mtx);
tasks.push(f);
cv.notify_all();
}
bool ExecOne()
{
std::function<void()> task;
{
std::unique_lock<std::mutex> lck(mtx);
cv.wait(lck, [this](){ return !running || !tasks.empty(); });
if (!running)
return false;
task = tasks.front();
tasks.pop();
}
if (task)
task();
return true;
}
bool PollOne()
{
std::function<void()> task;
{
std::lock_guard<std::mutex> lck(mtx);
if (!running || tasks.empty())
return false;
task = tasks.front();
tasks.pop();
}
if (task)
task();
return true;
}
private:
std::queue<std::function<void()>> tasks;
bool running{ true };
mutable std::mutex mtx;
std::condition_variable cv;
};
} // namespace cli
#endif // CLI_LOOPSCHEDULER_H_