What about "long int" type to store the time stamps? Even in microseconds it will take longer than 100 years to overflow 2^63.
NK On Sat, Mar 30, 2013 at 9:55 AM, Thiago Macieira <thiago.macie...@intel.com>wrote: > On sábado, 30 de março de 2013 09.34.24, Matthias Clasen wrote: > > >> - Various input events have a time field. The spec doesn't really say > > >> anything about this. What is it good for, and what units are these - > > >> monotonic time ? > > > > > > Monotonic (ideally) time in an undefined domain, i.e. they're only > > > meaningful on relation to each other. > > > > What can you do with them ? For the use case that Giulio mentioned > > (double-click detection), I'd need to know at least if the difference > > between two times is seconds or milliseconds or microseconds... > > The protocol needs to specify the unit. It can't be dependent on the device > driver, that makes no sense. If it's in milliseconds, it will overflow > every > 49.7 days. If it's microseconds, it will overflow every 71.6 minutes. > > It also needs to specify which timestamps are in the same time domain. Can > two > timestamps be compared to each other only if: > > - they are in the same input device (same mouse, same keyboard), but not > across devices > - they are in the same seat, but not across seats > - they are in input event messages, but not other types of messages that > carry timestamps > - no restriction > > For example, imagine the case of trying to ensure that a Ctrl key was > pressed > before a mouse click happened, after the events were plucked out of the > event > stream. > > Or is there another, recommended way of doing that, such as by using the > serials? > > -- > Thiago Macieira - thiago.macieira (AT) intel.com > Software Architect - Intel Open Source Technology Center > > _______________________________________________ > wayland-devel mailing list > wayland-devel@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/wayland-devel > >
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