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PROLOG | NAME | SYNOPSIS | DESCRIPTION | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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sched.h(0P) POSIX Programmer's Manual sched.h(0P)
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.
sched.h — execution scheduling
#include <sched.h>
The <sched.h> header shall define the pid_t type as described in
<sys/types.h>.
The <sched.h> header shall define the time_t type as described in
<sys/types.h>.
The <sched.h> header shall define the timespec structure as
described in <time.h>.
The <sched.h> header shall define the sched_param structure,
which shall include the scheduling parameters required for
implementation of each supported scheduling policy. This
structure shall include at least the following member:
int sched_priority Process or thread execution scheduling priority.
The sched_param structure defined in <sched.h> shall include 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 or thread 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.
sys_types.h(0p), time.h(0p)
The System Interfaces volume of POSIX.1‐2017,
sched_get_priority_max(3p), sched_getparam(3p),
sched_getscheduler(3p), sched_rr_get_interval(3p),
sched_setparam(3p), sched_setscheduler(3p), sched_yield(3p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 sched.h(0P)
Pages that refer to this page: pthread.h(0p), spawn.h(0p), posix_spawnattr_getschedparam(3p), posix_spawnattr_getschedpolicy(3p), pthread_attr_getinheritsched(3p), pthread_attr_getschedparam(3p), pthread_attr_getschedpolicy(3p), pthread_attr_getscope(3p), pthread_getschedparam(3p), sched_getparam(3p), sched_get_priority_max(3p), sched_getscheduler(3p), sched_rr_get_interval(3p), sched_setparam(3p), sched_setscheduler(3p), sched_yield(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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