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FTIMER(1)							     FTIMER(1)

NAME    [Toc]    [Back]

     ftimer - report realtime itimer status

SYNOPSIS    [Toc]    [Back]


DESCRIPTION    [Toc]    [Back]

     ftimer provides the cpu number of the processor handling the fast clock
     used by the real time itimer facility.  It	also reports any outstanding
     real time itimer timeouts.

     The fast clock is inactive	until it is first used,	then remains active
     from that time onward.  The fast clock typically becomes active when a
     realtime process (i.e., those running with	a non-degrading	priority, see
     npri(1)) executes setitimer(2), or	less frequently	when some special
     kernel driver needs the fast clock	enabled	for a high resolution interval
     timer and executes	an internal kernel routine.

     A user can	control	which processor	handles	the fast clock interrupts by
     using the mpadmin(1) command or the sysmp(2) programmatic syscall.

     Note, however, that ftimer(1) has no real relevance for Challenge/Onyx
     platforms,	as "fast clock"	interrupts are handled by all processors, not
     just by a single processor.  For Challenge/Onyx the distinction between
     "fast clock" itimers and "normal" itimers is made on the basis of what
     time resolution is	available, not on the basis of which physical hardware
     clock ("fast" or "normal")	implements the itimer.	As with	the other
     platforms,	realtime processes can get access to high resolution itimers,
     and non-realtime processes	can only use "normal" resolution itimers (see
     setitimer(2) and timers(5)).

SEE ALSO    [Toc]    [Back]

     npri(1), getitimer(2), setitimer(2), realtime(5), timers(5), mpadmin(1).

									PPPPaaaaggggeeee 1111
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