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46 .TH SCHED.H 3HEAD "Apr 1, 2008"
48 sched.h, sched \- execution scheduling
52 \fB#include <sched.h>\fR
58 The <\fBsched.h\fR> header defines the \fBsched_param\fR structure, which
59 contains the scheduling parameters required for implementation of each
60 supported scheduling policy. This structure contains the following member:
64 int sched_priority process execution scheduling priority
70 Each process is controlled by an associated scheduling policy and priority.
71 Associated with each policy is a priority range. Each policy definition
72 specifies the minimum priority range for that policy. The priority ranges for
73 each policy may overlap the priority ranges of other policies.
76 The scheduling policies are indicated by the values of the following symbolic
81 \fB\fBSCHED_OTHER\fR\fR
84 Processes are scheduled according to the traditional Time-Sharing Class (TS)
85 policy as described in \fBpriocntl\fR(2).
91 \fB\fBSCHED_FIFO\fR\fR
94 Processes are scheduled in the Real-Time (RT) scheduling class, according to
95 the First-In-First-Out (FIFO) policy. Processes scheduled to this policy, if
96 not preempted by a higher priority or interrupted by a signal, will proceed
106 Processes are scheduled in the Real-Time (RT) scheduling class, according to
107 the Round-Robin (RR) policy. Processes scheduled to this policy, if not
108 preempted by a higher priority or interrupted by a signal, will execute for a
109 time period, returned by \fBsched_rr_get_interval\fR(3C) or by the system.
118 Processes are scheduled according to the Inter-Active Class (IA) policy as
119 described in \fBpriocntl\fR(2).
125 \fB\fBSCHED_FSS\fR\fR
128 Processes are scheduled according to the Fair-Share Class (FSS) policy as
129 described in \fBpriocntl\fR(2).
138 Processes are scheduled according to the Fixed-Priority Class (FX) policy as
139 described in \fBpriocntl\fR(2).
144 The values of these constants are distinct.
147 Inclusion of the \fB<sched.h>\fR header will make visible symbols defined in
148 the header \fB<time.h>\fR.
152 \fBpriocntl\fR(2), \fBsched_get_priority_max\fR(3C),
153 \fBsched_get_priority_min\fR(3C), \fBsched_rr_get_interval\fR(3C),