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sched

sched.h(3HEAD)							      Headers							    sched.h(3HEAD)

NAME

       sched.h, sched - execution scheduling

SYNOPSIS

       #include <sched.h>

DESCRIPTION

       The  <sched.h>  header defines the sched_param structure, which contains the scheduling parameters required for implementation of each sup-
       ported scheduling policy. This structure contains the following member:

	 int	sched_priority	  process execution scheduling priority

       Each process is controlled by an associated scheduling policy and priority. Associated with each policy is a priority range.   Each  policy
       definition  specifies  the  minimum  priority range for that policy. The priority ranges for each policy may overlap the priority ranges of
       other policies.

       The scheduling policies are indicated by the values of the following symbolic constants:

       SCHED_OTHER    Processes are scheduled according to the traditional Time-Sharing Class (TS) policy as described in priocntl(2).

       SCHED_FIFO     Processes are scheduled in the Real-Time (RT) scheduling class, according to the	First-In-First-Out   (FIFO)  policy.  Pro-
		      cesses  scheduled  to this policy, if not preempted by a higher priority or interrupted by a signal, will proceed until com-
		      pletion.

       SCHED_RR       Processes are scheduled in the Real-Time (RT) scheduling class, according to the Round-Robin (RR) policy.  Processes  sched-
		      uled  to	this  policy,  if  not	preempted by a higher priority or interrupted by a signal, will execute for a time period,
		      returned by sched_rr_get_interval(3C) or by the system.

       SCHED_IA       Processes are scheduled according to the Inter-Active Class (IA) policy as described in priocntl(2).

       SCHED_FSS      Processes are scheduled according to the Fair-Share Class (FSS) policy as described in priocntl(2).

       SCHED_FX       Processes are scheduled according to the Fixed-Priority Class (FX) policy as described in priocntl(2).

       The values of these constants are distinct.

       Inclusion of the <sched.h> header will make visible symbols defined in the header <time.h>.

SEE ALSO

       priocntl(2), sched_get_priority_max(3C), sched_get_priority_min(3C), sched_rr_get_interval(3C), time.h(3HEAD)

SunOS 5.11							    1 Apr 2008							    sched.h(3HEAD)

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