SCHED_GET_PRIORITY_MAX(2) (2017-09-15)  SCHED_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 minimum prior-
          ity value that can be used with the scheduling algorithm
          identified by policy. Supported policy values are
          SCHED_FIFO, SCHED_RR, SCHED_OTHER, SCHED_BATCH, SCHED_IDLE,
          and SCHED_DEADLINE.  Further details about these policies
          can be found in sched(7).

          Processes with numerically higher priority values are sched-
          uled before processes with numerically lower priority val-
          ues.  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 range 1 to 99 for the
          SCHED_FIFO and SCHED_RR policies, and the priority 0 for the
          remaining policies.  Scheduling priority ranges for the var-
          ious 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.1 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, and errno is set appropriately.

     ERRORS

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     SCHED_GET_PRIORITY_MAX(2) (2017-09-15)  SCHED_GET_PRIORITY_MAX(2)

          EINVAL
               The argument policy does not identify a defined
               scheduling policy.

     CONFORMING TO
          POSIX.1-2001, POSIX.1-2008.

     SEE ALSO
          sched_getaffinity(2), sched_getparam(2),
          sched_getscheduler(2), sched_setaffinity(2),
          sched_setparam(2), sched_setscheduler(2), sched(7)

     COLOPHON
          This page is part of release 5.10 of the Linux man-pages
          project.  A description of the project, information about
          reporting bugs, and the latest version of this page, can be
          found at https://www.kernel.org/doc/man-pages/.

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