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  minimum  priority value that can be used with the scheduling algorithm identi-
       fied by policy. Supported policy values are SCHED_FIFO, SCHED_RR, SCHED_OTHER,  and
       SCHED_BATCH.   Further details about these policies can be found in sched_setsched-
       uler(2).

       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 and SCHED_BATCH.  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.1-2001  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 maxi-
       mum/minimum priority value for the  named  scheduling  policy.   On  error,  -1  is
       returned, and errno is set appropriately.

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

CONFORMING TO
       POSIX.1-2001.

SEE ALSO
       sched_getaffinity(2),   sched_getparam(2),  sched_getscheduler(2),  sched_setaffin-
       ity(2), sched_setparam(2), sched_setscheduler(2)

       Programming for the real world - POSIX.4 by Bill O. Gallmeister, O'Reilly  &  Asso-
       ciates, Inc., ISBN 1-56592-074-0



Linux 2.6.16                      2006-03-23               GET_PRIORITY_MAX(2)

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