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/*
* Copyright (c) 2020 - 2023 the ThorVG project. All rights reserved.
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
* 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 AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef _TVG_TASK_SCHEDULER_H_
#define _TVG_TASK_SCHEDULER_H_
#include <mutex>
#include <condition_variable>
#include "tvgCommon.h"
namespace tvg
{
struct Task;
struct TaskScheduler
{
static unsigned threads();
static void init(unsigned threads);
static void term();
static void request(Task* task);
};
struct Task
{
private:
mutex mtx;
condition_variable cv;
bool ready = true;
bool pending = false;
public:
virtual ~Task() = default;
void done()
{
if (!pending) return;
unique_lock<mutex> lock(mtx);
while (!ready) cv.wait(lock);
pending = false;
}
protected:
virtual void run(unsigned tid) = 0;
private:
void operator()(unsigned tid)
{
run(tid);
lock_guard<mutex> lock(mtx);
ready = true;
cv.notify_one();
}
void prepare()
{
ready = false;
pending = true;
}
friend struct TaskSchedulerImpl;
};
}
#endif //_TVG_TASK_SCHEDULER_H_
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