Around 15 o'clock on Nov 3, Michel =?ISO-8859-1?Q?D=E4nzer?= wrote:

> Oh, and are there any opinions about the signal to use, SIGALRM or
> something else?

You'll have to make it settable -- SIGALRM is already used by the X server 
for scheduling.  Of course, we could eliminate that if I could get the 
current time of day mapped into the X server address space :-)

> > * The interface needs to provide a vblank counter, so the user can easily
> >   detect dropped vblanks.
> 
> Has been there from day 1. I wonder what to do about this for the signal
> though, put the sequence number into the siginfo (is that possible?), or
> is the information you get back from the ioctl enough?

It would be nice to get it without another syscall; there's certainly 
enough space in the siginfo to pass it along.  I assume you'd pass along 
the current counter value and not some kind of delta.

Keith Packard        XFree86 Core Team        HP Cambridge Research Lab




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