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sched_get_priority_min (2)
  • sched_get_priority_min (2) ( FreeBSD man: Системные вызовы )
  • sched_get_priority_min (2) ( Русские man: Системные вызовы )
  • >> sched_get_priority_min (2) ( Linux man: Системные вызовы )
  • sched_get_priority_min (3) ( POSIX man: Библиотечные вызовы )
  •  

    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, SCHED_OTHER, and SCHED_BATCH. Further details about these policies can be found in sched_setscheduler(2).

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

    ERRORS

    EINVAL
    The argument 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_setaffinity(2), sched_setparam(2), sched_setscheduler(2)

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

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    SEE ALSO
    COLOPHON


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