Add first version

[ric-plt/sdl.git] / include / private / eventfd.hpp

diff --git a/include/private/eventfd.hpp b/include/private/eventfd.hpp
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+/*
+   Copyright (c) 2018-2019 Nokia.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+#ifndef SHAREDDATALAYER_EVENTFD_HPP_
+#define SHAREDDATALAYER_EVENTFD_HPP_
+
+#include <functional>
+#include <list>
+#include <mutex>
+#include "private/filedescriptor.hpp"
+
+namespace shareddatalayer
+{
+    class FDMonitor;
+    class Engine;
+    class System;
+
+    class EventFD
+    {
+    public:
+        explicit EventFD(Engine& engine);
+
+        EventFD(System& system, Engine& engine);
+
+        ~EventFD();
+
+        using Callback = std::function<void()>;
+
+        void post(const Callback& callback);
+
+        EventFD(EventFD&&) = delete;
+        EventFD(const EventFD&) = delete;
+        EventFD& operator = (EventFD&&) = delete;
+        EventFD& operator = (const EventFD&) = delete;
+
+    private:
+        using Callbacks = std::list<Callback>;
+
+        void atomicPushBack(const Callback& callback);
+
+        Callbacks atomicPopAll();
+
+        void handleEvents();
+
+        void executeCallbacks();
+
+        static void popAndExecuteFirstCallback(Callbacks& callbacks);
+
+        System& system;
+        FileDescriptor fd;
+        Callbacks callbacks;
+        std::mutex callbacksMutex;
+    };
+}
+
+#endif