redhat man page for sched_rr_get_interval

RR_GET_INTERVAL(2)					     Linux Programmer's Manual						RR_GET_INTERVAL(2)

NAME
       sched_rr_get_interval  - get the SCHED_RR interval for the named process

SYNOPSIS
       #include <sched.h>

       int sched_rr_get_interval(pid_t pid, struct timespec *tp);

       struct timespec {
	   time_t  tv_sec;     /* seconds */
	   long    tv_nsec;    /* nanoseconds */
       };

DESCRIPTION
       sched_rr_get_interval  writes  into the timespec structure pointed to by tp the round robin time quantum for the process identified by pid.
       If pid is zero, the time quantum for the calling process is written into *tp. The identified process should be running under  the  SCHED_RR
       scheduling policy.

       The round robin time quantum value is not alterable under Linux 1.3.81.

       POSIX systems on which sched_rr_get_interval is available define _POSIX_PRIORITY_SCHEDULING in <unistd.h>.

RETURN VALUE
       On success, sched_rr_get_interval returns 0.  On error, -1 is returned, and errno is set appropriately.

ERRORS
       ESRCH  The process whose ID is pid could not be found.

       ENOSYS The system call is not yet implemented.

CONFORMING TO
       POSIX.1b (formerly POSIX.4)

BUGS
       As  of  Linux  1.3.81 sched_rr_get_interval returns with error ENOSYS, because SCHED_RR has not yet been fully implemented and tested prop-
       erly.

SEE ALSO
       sched_setscheduler(2) has a description of the Linux scheduling scheme.

       Programming for the real world - POSIX.4 by Bill O. Gallmeister, O'Reilly & Associates, Inc., ISBN 1-56592-074-0
       IEEE Std 1003.1b-1993 (POSIX.1b standard, formerly POSIX.4)
       ISO/IEC 9945-1:1996

Linux 1.3.81							    1996-04-10							RR_GET_INTERVAL(2)