feat: godot-engine-source-4.3-stable

engine/thirdparty/thorvg/src/renderer/tvgTaskScheduler.h

@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2020 - 2024 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_
+
+#define _DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR
+
+#include <mutex>
+#include <condition_variable>
+
+#include "tvgCommon.h"
+#include "tvgInlist.h"
+
+namespace tvg {
+
+#ifdef THORVG_THREAD_SUPPORT
+
+struct Task
+{
+private:
+    mutex                   mtx;
+    condition_variable      cv;
+    bool                    ready = true;
+    bool                    pending = false;
+
+public:
+    INLIST_ITEM(Task);
+
+    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;
+};
+
+#else  //THORVG_THREAD_SUPPORT
+
+struct Task
+{
+public:
+    INLIST_ITEM(Task);
+
+    virtual ~Task() = default;
+    void done() {}
+
+protected:
+    virtual void run(unsigned tid) = 0;
+
+private:
+    friend struct TaskSchedulerImpl;
+};
+
+#endif  //THORVG_THREAD_SUPPORT
+
+
+struct TaskScheduler
+{
+    static uint32_t threads();
+    static void init(uint32_t threads);
+    static void term();
+    static void request(Task* task);
+    static void async(bool on);
+};
+
+}  //namespace
+
+#endif //_TVG_TASK_SCHEDULER_H_
+