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RedHat 9 (Linux i386) - man page for sched_get_priority_max (redhat section 2)

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 sched-
       uling 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 pol-
       icy 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_setscheduler(2), sched_getscheduler(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  &  Associates,
       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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