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 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.

       EINVAL Invalid pid.

       EFAULT Problem with copying information to userspace.

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)