Originální popis anglicky:
sched.h - execution scheduling (
REALTIME)
Návod, kniha: POSIX Programmer's Manual
#include <sched.h>
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 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.
None.
None.
None.
<time.h>
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
.
