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Linux 2.6 - man page for sched.h (linux section 7posix)

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

NAME
       sched.h - execution scheduling (REALTIME)

SYNOPSIS
       #include <sched.h>

DESCRIPTION
       The <sched.h> header shall define the sched_param structure, which contains 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 contain 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 priority. Associated
       with each policy is a priority range.  Each policy definition specifies the minimum prior-
       ity  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 orig-
       inal 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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