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sched_rr_get_interval() - Unix, Linux System Call
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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 */
};
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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
Tag | Description |
EFAULT |
Problem with copying information to userspace.
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EINVAL |
Invalid pid.
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ENOSYS |
The system call is not yet implemented.
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ESRCH |
The process whose ID is pid could not be found.
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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
properly.
SEE ALSO
Programming for the real world - POSIX.4 by Bill O. Gallmeister, OReilly & Associates, Inc., ISBN 1-56592-074-0
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