sched_get_priority_min - phpMan

GET_PRIORITY_MAX(2)        Linux Programmer’s Manual       GET_PRIORITY_MAX(2)



NAME
       sched_get_priority_max, sched_get_priority_min  - get static priority range

SYNOPSIS
       #include <sched.h>

       int sched_get_priority_max(int policy);

       int sched_get_priority_min(int policy);

DESCRIPTION
       sched_get_priority_max returns the maximum priority value that can be used with the
       scheduling algorithm identified by policy.  sched_get_priority_min returns the min-
       imum  priority  value  that can be used with the scheduling algorithm identified by
       policy. Supported policy values are SCHED_FIFO, SCHED_RR, and SCHED_OTHER.

       Processes with numerically higher priority values are  scheduled  before  processes
       with  numerically lower priority values. Thus, the value returned by sched_get_pri-
       ority_max will be greater than the value returned by sched_get_priority_min.

       Linux allows the static priority value range 1 to 99 for  SCHED_FIFO  and  SCHED_RR
       and  the  priority  0  for  SCHED_OTHER. Scheduling priority ranges for the various
       policies are not alterable.

       The range of scheduling priorities may vary on other POSIX systems, thus  it  is  a
       good  idea  for portable applications to use a virtual priority range and map it to
       the interval given by sched_get_priority_max and sched_get_priority_min.   POSIX.1b
       requires  a  spread  of  at least 32 between the maximum and the minimum values for
       SCHED_FIFO and SCHED_RR.

       POSIX systems on which sched_get_priority_max and sched_get_priority_min are avail-
       able define _POSIX_PRIORITY_SCHEDULING in <unistd.h>.


RETURN VALUE
       On  success,  sched_get_priority_max  and  sched_get_priority_min  return the maxi-
       mum/minimum priority value for the  named  scheduling  policy.   On  error,  -1  is
       returned, errno is set appropriately.

ERRORS
       EINVAL The parameter policy does not identify a defined scheduling policy.

CONFORMING TO
       POSIX.1b (formerly POSIX.4)

SEE ALSO
       sched_setaffinity(2),  sched_getaffinity(2), sched_setscheduler(2), sched_getsched-
       uler(2), sched_setparam(2), sched_getparam(2)

       sched_setscheduler(2) has a description of the Linux scheduling scheme.

       Programming for the real world - POSIX.4 by Bill O. Gallmeister, O’Reilly  &  Asso-
       ciates, Inc., ISBN 1-56592-074-0
       IEEE Std 1003.1b-1993 (POSIX.1b standard)
       ISO/IEC 9945-1:1996



Linux 1.3.81                      1996-04-10               GET_PRIORITY_MAX(2)

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