On Tuesday, November 17, 2015 5:04:09 PM CET René J. V. Bertin wrote: > > I can say for Wayland as I wrote that recently: > I'm guessing Wayland will provide a mechanism that's inspired by what Xcb > provides?
eh no. As I control both the server (hello KWin) and the client (hello KWayland) I just designed a protocol which is ideal for KIdleTime. > > > * it will fire if it's hit - there might be a delay which I think doesn't > > matter in the case of being swapped out. > > Do you mean that the delay is independent of whether or not you're swapped > out, or that the question of how long the delay is is moot if you are > (were) swapped out? It will "Fire if it's hit", but what "it" doesn't get > hit at the configured time but at a later time? Sorry, but I just don't get your problem here. This all sounds highly theoretical to me and is nothing which I considered at all. The implementation is basically: * Wayland client registers an idle timeout * KWayland::Server creates a QTimer * on each input event the QTimer is restarted * if the QTimer times out in the Wayland server the Wayland client is notified Now this includes a few IPC roundtrips which are completely outside the control of my code. Like the last step. What do I know when the client will be notified by the kernel about it? > > > The Wayland implementation doesn't give a guarantee that if there is an > > idle time of 5 sec it will be signalled exactly after 5 sec. That's > > something a non-realtime system cannot provide. > > Of course not. But that doesn't mean it is pointless to try to minimise the > delay (for instance by polling ;)) There is absolutely zero polling in the Wayland implementation! > And I really don't see the point in providing a framework for this (and > basically only this) if it's not going to try to be as versatile as > possible. It can and should aim to avoid hogging any resources in the > default configuration. Repeat after me: no polling! I mean that: NO POLLING! Don't add code which polls. Don't do that. NO POLLING! If you cannot do that on OSX, I really think it's better to not provide it. If you think it's unfair that there is a backend for X11 which performs polling, then I'm going to delete the XScreenSaver based one. Cheers Martin
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