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    Command:

    sched_get_priority_max

    
    
    
    

    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,  SCHED_BATCH,  and
           SCHED_IDLE.   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,   SCHED_BATCH,   and
           SCHED_IDLE.   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 pri-
           ority range and map  it  to  the  interval  given  by  sched_get_prior-
           ity_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_prior-
           ity_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 pol-
           icy.  On error, -1 is returned, and errno is set appropriately.
    
    
    

    ERRORS

           EINVAL The  argument policy does not identify a defined scheduling pol-
                  icy.
    
    
    

    CONFORMING TO

           POSIX.1-2001.
    
    
    

    SEE ALSO

           sched_getaffinity(2), sched_getparam(2), sched_getscheduler(2),
    
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