получить и установить атрибут переменной условия выбора часов (get and set the clock selection condition variable attribute)
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_condattr_getclock, pthread_condattr_setclock — get and
set the clock selection condition variable attribute
Синопсис (Synopsis)
#include <pthread.h>
int pthread_condattr_getclock(const pthread_condattr_t *restrict attr,
clockid_t *restrict clock_id);
int pthread_condattr_setclock(pthread_condattr_t *attr,
clockid_t clock_id);
Описание (Description)
The pthread_condattr_getclock() function shall obtain the value
of the clock attribute from the attributes object referenced by
attr.
The pthread_condattr_setclock() function shall set the clock
attribute in an initialized attributes object referenced by attr.
If pthread_condattr_setclock() is called with a clock_id argument
that refers to a CPU-time clock, the call shall fail.
The clock attribute is the clock ID of the clock that shall be
used to measure the timeout service of pthread_cond_timedwait().
The default value of the clock attribute shall refer to the
system clock.
The behavior is undefined if the value specified by the attr
argument to pthread_condattr_getclock() or
pthread_condattr_setclock() does not refer to an initialized
condition variable attributes object.
Возвращаемое значение (Return value)
If successful, the pthread_condattr_getclock() function shall
return zero and store the value of the clock attribute of attr
into the object referenced by the clock_id argument. Otherwise,
an error number shall be returned to indicate the error.
If successful, the pthread_condattr_setclock() function shall
return zero; otherwise, an error number shall be returned to
indicate the error.
Ошибки (Error)
The pthread_condattr_setclock() function may fail if:
EINVAL The value specified by clock_id does not refer to a known
clock, or is a CPU-time clock.
These functions shall not return an error code of [EINTR].
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
If an implementation detects that the value specified by the attr
argument to pthread_condattr_getclock() or
pthread_condattr_setclock() does not refer to an initialized
condition variable 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_cond_destroy(3p), pthread_cond_timedwait(3p),
pthread_condattr_destroy(3p), pthread_condattr_getpshared(3p),
pthread_create(3p), pthread_mutex_destroy(3p)
The Base Definitions volume of POSIX.1‐2017, pthread.h(0p)
