sched_rr_get_interval (2)

NAME

       sched_rr_get_interval   -  get the SCHED_RR interval for the named pro-
       cess

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)