RR_GET_INTERVAL

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
BUGS
SEE ALSO

NAME

sched_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 */

};

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 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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