RR_GET_INTERVAL(2) Linux Programmer's Manual RR_GET_INTERVAL(2)NAMEsched_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 */
};
DESCRIPTIONsched_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
EFAULT Problem with copying information to userspace.
EINVAL Invalid pid.
ENOSYS The system call is not yet implemented.
ESRCH The process whose ID is pid could not be found.
CONFORMING TO
POSIX.1-2001.
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 ALSOsched_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
Linux 1.3.81 1996-04-10 RR_GET_INTERVAL(2)
