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sched_rr_get_interval(3)
NAME
  sched_rr_get_interval - Returns the current quantum for process execution
  under the SCHED_RR policy (P1003.1b)

SYNOPSIS
  #include <sched.h>

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

LIBRARY
  Realtime Library (librt.so, librt.a)

PARAMETERS
  pid Specifies the ID of the process for which the quantum is to be
      returned.

  *interval
      Specifies the location to receive the current quantum for process
      execution under the SCHED_RR scheduling policy.

DESCRIPTION
  The sched_rr_get_interval function updates the timespec structure
  referenced by the interval argument to contain the current quantum for the
  process executing under the SCHED_RR policy. If a process running under the
  round-robin scheduling policy runs without blocking or yielding for more
  than this amount of time, it may be preempted by another runnable process
  (at the same priority).

  If the PID argument is zero, the current execution time limit for the
  calling process is returned.

  No special privileges are needed to use the sched_rr_get_interval function.

RETURN VALUES
  On a successful call, a value of 0 (zero) is returned. On an unsuccessful
  call, a value of -1 is returned and errno is set to indicate the error.

ERRORS
  The sched_rr_get_interval fails under the following condition:

  [ESRCH]
      The value of the pid parameter does not indicate an existing process.

SEE ALSO
  Functions: sched_getparam(3), sched_getscheduler(3), sched_setparam(3),
  sched_setscheduler(3)

  Guide to Realtime Programming

Index for Section 3

Alphabetical listing for S

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