Ichthyostega
4699ae8f03
This implies a basic decision regarding the buffer and state data to use, and how this can be defined, parameterised and passed between threads. I decided to place separation of domains first and to prefer using a functional callback over using a shared data structure.
93 lines
1.9 KiB
C++
93 lines
1.9 KiB
C++
/*
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demo-uring.cpp - async file IO with io_uring
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Copyright (C)
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2026, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU GPL version 2+ See the LICENSE file for details.
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* ************************************************************************/
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#include "commons.hpp"
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#include "egl-display.hpp"
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#include "gtk-uring-app.hpp"
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#include <iostream>
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#include <memory>
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#include <thread>
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using std::unique_ptr;
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//-----------------hard-coded-config--
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const size_t RING_SIZ = 5;
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const uint VIDEO_WIDTH = 320;
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const uint VIDEO_HEIGHT = 240;
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//-----------------hard-coded-config--
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class UringVideoPlayer
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{
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using VideoDisplay = EglDisplay<uint8_t, VIDEO_WIDTH,VIDEO_HEIGHT>;
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using Buffer = VideoDisplay::Buffer;
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Glib::Dispatcher dispatchFrame_;
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VideoDisplay videoDisplayer_;
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std::thread proactorThread_;
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public:
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UringVideoPlayer (Gtk::Window& appWindow)
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: videoDisplayer_{appWindow, dispatchFrame_, [this]{ return retrieveCurrFrame(); }}
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, proactorThread_{[this]{ playVideo(); }}
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{ }
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void terminate();
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private:
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void
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playVideo()
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{
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// allocate buffer data structure
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// initialise URing
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// ++ proactor-loop ++
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}
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Buffer*
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retrieveCurrFrame()
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{
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///////OOO threadsafe hand-over of current frame data
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}
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};
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unique_ptr<UringVideoPlayer>
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launchPlayer (Gtk::Window& appWindow)
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{
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appWindow.resize (VIDEO_WIDTH, VIDEO_HEIGHT);
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auto player = std::make_unique<UringVideoPlayer> (appWindow);
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return player;
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}
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void
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UringVideoPlayer::terminate()
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{
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///// signal stop to proactor
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videoDisplayer_.cleanUp();
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}
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int
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main (int, const char*[])
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{
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return GtkUringApp<UringVideoPlayer>{"io-uring-demo"}
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.onClick (launchPlayer)
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.onClose ([](auto& player){ player.terminate();})
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.run();
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}
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