Originální popis anglicky:
sched_rr_get_interval - get the SCHED_RR interval for the named process
Návod, kniha: Linux Programmer's Manual
#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 */
};
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>.
On success,
sched_rr_get_interval returns 0. On error, -1 is returned,
and
errno is set appropriately.
- 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.
POSIX.1b (formerly POSIX.4)
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.
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
