NAME

       sched_get_priority_max, sched_get_priority_min, sched_rr_get_interval — get scheduling parameter limits

LIBRARY

       Standard C Library (libc, -lc)

SYNOPSIS

       #include <sched.h>

       int
       sched_get_priority_max(int policy);

       int
       sched_get_priority_min(int policy);

       int
       sched_rr_get_interval(pid_t pid, struct timespec *interval);

DESCRIPTION

       The  sched_get_priority_max() and sched_get_priority_min() system calls return the appropriate maximum or
       minimum, respectively, for the scheduling policy specified by policy.  The sched_rr_get_interval() system
       call updates the timespec structure referenced by the interval argument to contain the current  execution
       time  limit (i.e., time quantum) for the process specified by pid.  If pid is zero, the current execution
       time limit for the calling process is returned.

       The value of policy should be one of the scheduling policy values defined in <sched.h>:

       [SCHED_FIFO]   First-in-first-out fixed priority scheduling with no round robin scheduling;

       [SCHED_OTHER]  The standard time sharing scheduler;

       [SCHED_RR]     Round-robin scheduling across same priority processes.

RETURN VALUES

       If successful, the sched_get_priority_max() and sched_get_priority_min() system calls  shall  return  the
       appropriate  maximum  or  minimum values, respectively.  If unsuccessful, they shall return a value of -1
       and set errno to indicate the error.

       The sched_rr_get_interval() function returns the value  0  if  successful;  otherwise  the  value  -1  is
       returned and the global variable errno is set to indicate the error.

ERRORS

       On failure errno will be set to the corresponding value:

       [EINVAL]           The value of the policy argument does not represent a defined scheduling policy.

       [ENOSYS]           The  sched_get_priority_max(),  sched_get_priority_min(),  and sched_rr_get_interval()
                          system calls are not supported by the implementation.

       [ESRCH]            No process can be found corresponding to that specified by pid.

SEE ALSO

       sched_getparam(2), sched_getscheduler(2), sched_setparam(2), sched_setscheduler(2)

STANDARDS

       The sched_get_priority_max(), sched_get_priority_min(), and sched_rr_get_interval() system calls  conform
       to IEEE Std 1003.1b-1993 (“POSIX.1”).

Debian                                           March 12, 1998                        SCHED_GET_PRIORITY_MAX(2)