[CFR] Kevent timer improvements

[John Baldwin]

On Monday, March 10, 2014 2:23:33 pm John-Mark Gurney wrote:
> Baptiste Daroussin wrote this message on Mon, Mar 10, 2014 at 14:16 +0100:
> > A glib developer pointed me to some of the improvements Apple has done on
> > kqueue(2), some of those improvements are used or will be used by glib in the
> > near futur, plus add new one.
> > 
> > I decided to implement part of it and here is the first patch about it:
> > http://people.freebsd.org/~bapt/kevent.diff
> > 
> > I will update the manpages accordingly as well:
> > 
> > Basically this patch added the following to the EVFILT_TIMER:
> > NOTE_SECONDS   data is in seconds
> > NOTE_USECONDS  data is in microseconds
> > NOTE_NSECONDS  data is in nanoseconds
> 
> Could you contact the maintainer of sbintime and look at adding an
> SBINTIME_MAX/_MIN define macros and use those instead of INT64_MAX?  We
> shouldn't know the internal implementation type of sbintime_t in the
> code in case the type changes...
> 
> > I do plan to add kevent64 support compatible with apple implementation later, as
> > using NOTE_MONOTONIC without 64bit support is not useful very long :)
> 
> Is this just to support 64bit data on a 32bit system?  Also, why is
> ident grown to 64bits?  I don't see any filters that could possibly
> need the additional range...  I can understand data be expanded to
> 64bits...
> 
> Also, what exactly is ext used for?  I'm looking at MacOSX's description
> of ext, and it isn't clear.. it basicly says "ext[0] is passed through
> much like udata" (only much? not exactly like?), and "ext[1] can always
> be used like udata"...  It isn't clear how/what these are used for, etc..
> 
> It looks like the "much like udata" part is because using the
> EVFILT_MACHPORT will overwrite it.  If we do import this, I'd like to
> be clear on how they are used, i.e. their use is specified by the
> filter, and if the filter does not use them, they are exactly like
> additional udata fields..

Yes, my reading is that that is what they are in practice on OS X, but
the manpage has rotted.

-- 
John Baldwin