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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 minimum 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_priority_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          available         define
       _POSIX_PRIORITY_SCHEDULING in <unistd.h>.

RETURN VALUE

       On  success,  sched_get_priority_max()   and   sched_get_priority_min()
       return  the  maximum/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_getaffinity(2),     sched_getparam(2),     sched_getscheduler(2),
       sched_setaffinity(2), sched_setparam(2), sched_setscheduler(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 & Associates, Inc., ISBN 1-56592-074-0
       IEEE Std 1003.1b-1993 (POSIX.1b standard)
       ISO/IEC 9945-1:1996