sched_rr_get_interval man page on Archlinux

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SCHED_RR_GET_INTERVAL(2)   Linux Programmer's Manual  SCHED_RR_GET_INTERVAL(2)

       sched_rr_get_interval - get the SCHED_RR interval for the named process

       #include <sched.h>

       int sched_rr_get_interval(pid_t pid, struct timespec * tp);

       sched_rr_get_interval()	writes	into the timespec structure pointed to
       by tp the round-robin time quantum for the process identified  by  pid.
       The  specified  process should be running under the SCHED_RR scheduling

       The timespec structure has the following form:

	   struct timespec {
	       time_t tv_sec;	 /* seconds */
	       long   tv_nsec;	 /* nanoseconds */

       If pid is zero, the time quantum for the	 calling  process  is  written
       into *tp.

       On  success,  sched_rr_get_interval()  returns  0.   On	error,	-1  is
       returned, and errno is set appropriately.

       EFAULT Problem with copying information to user space.

       EINVAL Invalid pid.

       ENOSYS The system call is not yet implemented (only on rather old  ker‐

       ESRCH  Could not find a process with the ID pid.


       POSIX  systems  on  which  sched_rr_get_interval()  is available define
       _POSIX_PRIORITY_SCHEDULING in <unistd.h>.

   Linux notes
       POSIX does not specify any mechanism for controlling the	 size  of  the
       round-robin  time quantum.  Older Linux kernels provide a (nonportable)
       method of doing this.  The quantum can be controlled by	adjusting  the
       process's nice value (see setpriority(2)).  Assigning a negative (i.e.,
       high) nice value results in a  longer  quantum;	assigning  a  positive
       (i.e., low) nice value results in a shorter quantum.  The default quan‐
       tum is 0.1 seconds; the degree to which changing the nice value affects
       the quantum has varied somewhat across kernel versions.	This method of
       adjusting the quantum was removed starting with Linux 2.6.24.

       Linux 3.9 added	a  new	mechanism  for	adjusting  (and	 viewing)  the
       SCHED_RR	  quantum:   the  /proc/sys/kernel/sched_rr_timeslice_ms  file
       exposes the quantum as a	 millisecond  value,  whose  default  is  100.
       Writing 0 to this file resets the quantum to the default value.

       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.

       This page is part of release 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

Linux				  2013-03-18	      SCHED_RR_GET_INTERVAL(2)

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