получить и установить атрибут contentionscope (НИТИ В РЕАЛЬНОМ ВРЕМЕНИ) (get and set the contentionscope 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_getscope, pthread_attr_setscope — get and set the
contentionscope attribute (REALTIME THREADS)
Синопсис (Synopsis)
#include <pthread.h>
int pthread_attr_getscope(const pthread_attr_t *restrict attr,
int *restrict contentionscope);
int pthread_attr_setscope(pthread_attr_t *attr, int contentionscope);
Описание (Description)
The pthread_attr_getscope() and pthread_attr_setscope()
functions, respectively, shall get and set the contentionscope
attribute in the attr object.
The contentionscope attribute may have the values
PTHREAD_SCOPE_SYSTEM, signifying system scheduling contention
scope, or PTHREAD_SCOPE_PROCESS, signifying process scheduling
contention scope. The symbols PTHREAD_SCOPE_SYSTEM and
PTHREAD_SCOPE_PROCESS are defined in the <pthread.h> header.
The behavior is undefined if the value specified by the attr
argument to pthread_attr_getscope() or pthread_attr_setscope()
does not refer to an initialized thread attributes object.
Возвращаемое значение (Return value)
If successful, the pthread_attr_getscope() and
pthread_attr_setscope() functions shall return zero; otherwise,
an error number shall be returned to indicate the error.
Ошибки (Error)
The pthread_attr_setscope() function shall fail if:
ENOTSUP
An attempt was made to set the attribute to an unsupported
value.
The pthread_attr_setscope() function may fail if:
EINVAL The value of contentionscope 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_getscope() or pthread_attr_setscope()
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_getinheritsched(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)
