получить и установить унаследованный атрибут (НИТИ В РЕАЛЬНОМ ВРЕМЕНИ) (get and set the inheritsched attribute (REALTIME THREADS))
Пролог (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.
Имя (Name)
pthread_attr_getinheritsched, pthread_attr_setinheritsched — get
and set the inheritsched attribute (REALTIME THREADS)
Синопсис (Synopsis)
#include <pthread.h>
int pthread_attr_getinheritsched(const pthread_attr_t *restrict attr,
int *restrict inheritsched);
int pthread_attr_setinheritsched(pthread_attr_t *attr,
int inheritsched);
Описание (Description)
The pthread_attr_getinheritsched() and
pthread_attr_setinheritsched() functions, respectively, shall get
and set the inheritsched attribute in the attr argument.
When the attributes objects are used by pthread_create(), the
inheritsched attribute determines how the other scheduling
attributes of the created thread shall be set.
The supported values of inheritsched shall be:
PTHREAD_INHERIT_SCHED
Specifies that the thread scheduling attributes shall be
inherited from the creating thread, and the scheduling
attributes in this attr argument shall be ignored.
PTHREAD_EXPLICIT_SCHED
Specifies that the thread scheduling attributes shall be
set to the corresponding values from this attributes
object.
The symbols PTHREAD_INHERIT_SCHED and PTHREAD_EXPLICIT_SCHED are
defined in the <pthread.h> header.
The following thread scheduling attributes defined by
POSIX.1‐2008 are affected by the inheritsched attribute:
scheduling policy (schedpolicy), scheduling parameters
(schedparam), and scheduling contention scope (contentionscope).
The behavior is undefined if the value specified by the attr
argument to pthread_attr_getinheritsched() or
pthread_attr_setinheritsched() does not refer to an initialized
thread attributes object.
Возвращаемое значение (Return value)
If successful, the pthread_attr_getinheritsched() and
pthread_attr_setinheritsched() functions shall return zero;
otherwise, an error number shall be returned to indicate the
error.
Ошибки (Error)
The pthread_attr_setinheritsched() function shall fail if:
ENOTSUP
An attempt was made to set the attribute to an unsupported
value.
The pthread_attr_setinheritsched() function may fail if:
EINVAL The value of inheritsched is not valid.
These functions shall not return an error code of [EINTR].
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
After these attributes have been set, a thread can be created
with the specified attributes using pthread_create(). Using
these routines does not affect the current running thread.
See Section 2.9.4, Thread Scheduling for further details on
thread scheduling attributes and their default settings.
Обоснование (Rationale)
If an implementation detects that the value specified by the attr
argument to pthread_attr_getinheritsched() or
pthread_attr_setinheritsched() does not refer to an initialized
thread attributes object, it is recommended that the function
should fail and report an [EINVAL] error.
Будущие направления (Future directions)
None.
Смотри также (See also)
pthread_attr_destroy(3p), pthread_attr_getscope(3p),
pthread_attr_getschedpolicy(3p), pthread_attr_getschedparam(3p),
pthread_create(3p)
The Base Definitions volume of POSIX.1‐2017, pthread.h(0p),
sched.h(0p)
