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<sched.h>(P)		   POSIX Programmer's Manual		  <sched.h>(P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       sched.h - execution scheduling (REALTIME)

SYNOPSIS
       #include <sched.h>

DESCRIPTION
       The <sched.h> header shall define the sched_param structure, which con‐
       tains  the  scheduling  parameters  required for implementation of each
       supported scheduling policy. This structure shall contain at least  the
       following member:

	      int	sched_priority	      Process execution scheduling priority.

       In addition, if _POSIX_SPORADIC_SERVER or _POSIX_THREAD_SPORADIC_SERVER
       is defined, the sched_param structure defined in <sched.h>  shall  con‐
       tain the following members in addition to those specified above:

	      int	      sched_ss_low_priority Low scheduling priority for
						    sporadic server.
	      struct timespec sched_ss_repl_period  Replenishment period for
						    sporadic server.
	      struct timespec sched_ss_init_budget  Initial budget for sporadic server.
	      int	      sched_ss_max_repl	    Maximum pending replenishments for
						    sporadic server.

       Each  process is controlled by an associated scheduling policy and pri‐
       ority. 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.

       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:

       SCHED_FIFO
	      First in-first out (FIFO) scheduling policy.

       SCHED_RR
	      Round robin scheduling policy.

       SCHED_SPORADIC
	      Sporadic server scheduling policy.

       SCHED_OTHER
	      Another scheduling policy.

       The values of these constants are distinct.

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided.

	      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);

       Inclusion of the <sched.h> header may make visible all symbols from the
       <time.h> header.

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       <time.h>

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 .

IEEE/The Open Group		     2003			  <sched.h>(P)
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