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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "<sched.h>" 0P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" <sched.h> 
+.SH NAME
+sched.h \- execution scheduling (\fBREALTIME\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <sched.h> \fP
+.SH DESCRIPTION
+.LP
+The \fI<sched.h>\fP header shall define the \fBsched_param\fP structure,
+which contains the scheduling parameters
+required for implementation of each supported scheduling policy. This
+structure shall contain at least the following member:
+.sp
+.RS
+.nf
+
+\fBint       sched_priority       \fP Process execution scheduling priority. \fB
+\fP
+.fi
+.RE
+.LP
+In addition, if _POSIX_SPORADIC_SERVER or _POSIX_THREAD_SPORADIC_SERVER
+is defined, the \fBsched_param\fP structure defined in
+\fI<sched.h>\fP shall contain the following members in addition to
+those specified above:
+.sp
+.RS
+.nf
+
+\fBint             sched_ss_low_priority\fP Low scheduling priority for \fB
+                                     \fP sporadic server. \fB
+struct timespec sched_ss_repl_period \fP Replenishment period for \fB
+                                     \fP sporadic server. \fB
+struct timespec sched_ss_init_budget \fP Initial budget for sporadic server. \fB
+int             sched_ss_max_repl    \fP Maximum pending replenishments for \fB
+                                     \fP sporadic server. \fB
+\fP
+.fi
+.RE
+.LP
+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.
+.LP
+Four scheduling policies are defined; others may be defined by the
+implementation. The four standard policies are indicated by
+the values of the following symbolic constants:
+.TP 7
+SCHED_FIFO
+First in-first out (FIFO) scheduling policy.
+.TP 7
+SCHED_RR
+Round robin scheduling policy.
+.TP 7
+SCHED_SPORADIC
+Sporadic server scheduling policy. 
+.TP 7
+SCHED_OTHER
+Another scheduling policy.
+.sp
+.LP
+The values of these constants are distinct.
+.LP
+The following shall be declared as functions and may also be defined
+as macros. Function prototypes shall be provided.
+.sp
+.RS
+.nf
+
+\fB
+int    sched_get_priority_max(int);
+int    sched_get_priority_min(int);
+
+int    sched_getparam(pid_t, struct sched_param *);
+int    sched_getscheduler(pid_t);
+
+int    sched_rr_get_interval(pid_t, struct timespec *);
+
+int    sched_setparam(pid_t, const struct sched_param *);
+int    sched_setscheduler(pid_t, int, const struct sched_param *);
+
+int    sched_yield(void);
+
+
+\fP
+.fi
+.RE
+.LP
+Inclusion of the \fI<sched.h>\fP header may make visible all symbols
+from the \fI<time.h>\fP header.
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fI<time.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .