SCHED_RR_GET_INTERVAL man page on Scientific

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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 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.  The identified process should be running under the SCHED_RR
       scheduling policy.  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 (only on rather old  ker‐

       ESRCH  The process whose ID is pid could not be found.


   Linux Notes
       POSIX  does  not	 specify any mechanism for controlling the size of the
       round-robin time quantum.  However,  Linux  provides  a	(non-portable)
       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.

       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 3.22 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

Linux				  2007-04-06	      SCHED_RR_GET_INTERVAL(2)

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