Subj : Re: Solaris real-time thread capabilities
To   : comp.unix.solaris,comp.programming.threads
From : David Powell
Date : Wed Sep 07 2005 02:12 pm

capnwhit@yahoo.com wrote:
> Casper H. S. Dik wrote:
> 
>>The setitimer() function is much better at delivering the
>>right number of signals per unit of time.
>>
> 
> Aha!... Pearls of wisdom from the collective knowledge of the human
> race, brought directly to your neighborhood by the power of Usenet and
> Google! Thanks a lot Casper! I will try this as well! 

   Better still could be timer_create(3RT).  With it and CLOCK_HIGHRES,
   you can get the highest precision timing available to a user program
   on Solaris.  The implementation of CLOCK_HIGHRES timers is based on
   the kernel's cyclic subsystem[1] instead of the system clock.  This
   means your timeouts aren't constrained to the system clock rate (so
   there's no need to set hires_tick to get improved precision).

   The one caveat is that, in order to use CLOCK_HIGHRES timers, your
   process must either be run as root or (on Solaris 10) otherwise have
   the PRIV_PROC_CLOCK_HIGHRES privilege.

   Dave

[1] http://blogs.sun.com/roller/page/eschrock?anchor=inside_the_cyclic_subsystem

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