RR_GET_INTERVAL (2)
get the SCHED_RR interval for the named process
SYNOPSIS
#include <sched.h>
int sched_rr_get_interval(pid_t pid, struct timespec *tp);
4n 12n 24n
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
properly.
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
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