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<sched.h>(P) POSIX Programmer's Manual <sched.h>(P)
sched.h - execution scheduling (REALTIME)
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
struct timespec sched_ss_repl_period Replenishment period for
struct timespec sched_ss_init_budget Initial budget for sporadic server.
int sched_ss_max_repl Maximum pending replenishments for
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:
First in-first out (FIFO) scheduling policy.
Round robin scheduling policy.
Sporadic server scheduling policy.
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_getparam(pid_t, struct sched_param *);
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 *);
Inclusion of the <sched.h> header may make visible all symbols from the <time.h> header.
The following sections are informative.
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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