sched_getscheduler man page on OSF1

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sched_getscheduler(3)					 sched_getscheduler(3)

NAME
       sched_getscheduler  -  Returns  the  scheduling	policy	of  a  process
       (P1003.1b)

SYNOPSIS
       #include <sched.h>

       int sched_getscheduler ( pid_t pid);

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

PARAMETERS
       Specifies the ID of the process for which the scheduling policy	is  to
       be  obtained.  If  pid  is  zero,  the scheduling policy of the calling
       process is obtained.

DESCRIPTION
       The sched_getscheduler function returns the current  scheduling	policy
       of a process. The values that can be returned are defined in the header
       file <sched.h>.

       The sched_setscheduler function changes the scheduling policy and  pri‐
       ority of a process. Changing the scheduling policy and priority ensures
       that an application can determine more effectively when a process  will
       run.

       The  realtime  scheduling policies are as follows: Specifies the first-
       in, first-out (FIFO) scheduling policy Specifies the  round-robin  (RR)
       scheduling policy Specifies the standard timesharing scheduling policy

       The  SCHED_FIFO	and  SCHED_RR  scheduling  policies are fixed-priority
       scheduling policies. You can specify a priority for  your  process  and
       the  scheduler  will  not  adjust it. Setting priorities in conjunction
       with a SCHED_FIFO scheduling policy allows a critical process to run as
       soon  as	 it  is	 ready,	 for  as  long as it needs to run, because the
       process will preempt other lower-priority processes.

       The round-robin scheduling policy is similar to first in-first out, but
       also imposes a quantum on execution time. Use the sched_rr_get_interval
       function to determine the current quantum for process  execution	 under
       the SCHED_RR scheduling policy.

       The  scheduler adjusts process priorities running under the timesharing
       scheduling policy.

       No special privileges are needed to use	the  sched_getscheduler	 func‐
       tion.

RETURN VALUES
       On  a  successful  call to sched_getscheduler, the scheduling policy of
       the process is returned. If there is an error, -1 is returned and errno
       is set to indicate the error.

ERRORS
       The sched_getscheduler function fails under the following condition: No
       process can be found corresponding to that specified by pid.

SEE ALSO
       Functions:     getpid(2),     sched_getparam(3),	    sched_setparam(3),
       sched_setscheduler(3)

       Guide to Realtime Programming

							 sched_getscheduler(3)
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