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+/*
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+ * Copyright (c) 2020 - 2024 the ThorVG project. All rights reserved.
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+
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+ * Permission is hereby granted, free of charge, to any person obtaining a copy
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+ * of this software and associated documentation files (the "Software"), to deal
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+ * in the Software without restriction, including without limitation the rights
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+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+ * copies of the Software, and to permit persons to whom the Software is
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+ * furnished to do so, subject to the following conditions:
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+
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+ * The above copyright notice and this permission notice shall be included in all
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+ * copies or substantial portions of the Software.
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+
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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+ * SOFTWARE.
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+ */
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+
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+#ifndef _TVG_TASK_SCHEDULER_H_
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+#define _TVG_TASK_SCHEDULER_H_
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+
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+#include <mutex>
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+#include <condition_variable>
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+
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+#include "tvgCommon.h"
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+#include "tvgInlist.h"
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+
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+namespace tvg {
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+
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+#ifdef THORVG_THREAD_SUPPORT
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+
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+struct Task
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+{
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+private:
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+ mutex mtx;
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+ condition_variable cv;
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+ bool ready = true;
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+ bool pending = false;
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+
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+public:
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+ INLIST_ITEM(Task);
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+
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+ virtual ~Task() = default;
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+
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+ void done()
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+ {
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+ if (!pending) return;
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+
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+ unique_lock<mutex> lock(mtx);
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+ while (!ready) cv.wait(lock);
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+ pending = false;
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+ }
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+
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+protected:
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+ virtual void run(unsigned tid) = 0;
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+
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+private:
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+ void operator()(unsigned tid)
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+ {
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+ run(tid);
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+
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+ lock_guard<mutex> lock(mtx);
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+ ready = true;
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+ cv.notify_one();
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+ }
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+
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+ void prepare()
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+ {
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+ ready = false;
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+ pending = true;
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+ }
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+
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+ friend struct TaskSchedulerImpl;
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+};
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+
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+#else //THORVG_THREAD_SUPPORT
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+
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+struct Task
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+{
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+public:
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+ INLIST_ITEM(Task);
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+
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+ virtual ~Task() = default;
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+ void done() {}
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+
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+protected:
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+ virtual void run(unsigned tid) = 0;
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+
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+private:
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+ friend struct TaskSchedulerImpl;
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+};
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+
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+#endif //THORVG_THREAD_SUPPORT
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+
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+
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+struct TaskScheduler
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+{
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+ static uint32_t threads();
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+ static void init(uint32_t threads);
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+ static void term();
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+ static void request(Task* task);
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+ static void async(bool on);
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+};
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+
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+} //namespace
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+
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+#endif //_TVG_TASK_SCHEDULER_H_
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+
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