Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help 
SCHED_GET_PRIORITY_MAX(2)      System Calls Manual     SCHED_GET_PRIORITY_MAX(2)

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  re-
     turn  the	appropriate maximum or minimum, respectively, for the scheduling
     policy specified by policy.  The sched_rr_get_interval()  system  call  up-
     dates the timespec structure referenced by the interval argument to contain
     the current execution time limit (i.e., time quantum) for the process spec-
     ified  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, re-
     spectively.  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  sup-
			ported 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").

FreeBSD ports 15.quarterly	 March 12, 1998        SCHED_GET_PRIORITY_MAX(2)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=sched_get_priority_max&sektion=2&manpath=FreeBSD+15.1-RELEASE+and+Ports.quarterly>

home | help