уничтожить и инициализировать объект атрибутов переменной условия (destroy and initialize the condition variable attributes object)
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_destroy, pthread_condattr_init — destroy and
initialize the condition variable attributes object
Синопсис (Synopsis)
#include <pthread.h>
int pthread_condattr_destroy(pthread_condattr_t *attr);
int pthread_condattr_init(pthread_condattr_t *attr);
Описание (Description)
The pthread_condattr_destroy() function shall destroy a condition
variable attributes object; the object becomes, in effect,
uninitialized. An implementation may cause
pthread_condattr_destroy() to set the object referenced by attr
to an invalid value. A destroyed attr attributes object can be
reinitialized using pthread_condattr_init(); the results of
otherwise referencing the object after it has been destroyed are
undefined.
The pthread_condattr_init() function shall initialize a condition
variable attributes object attr with the default value for all of
the attributes defined by the implementation.
Results are undefined if pthread_condattr_init() is called
specifying an already initialized attr attributes object.
After a condition variable attributes object has been used to
initialize one or more condition variables, any function
affecting the attributes object (including destruction) shall not
affect any previously initialized condition variables.
This volume of POSIX.1‐2017 requires two attributes, the clock
attribute and the process-shared attribute.
Additional attributes, their default values, and the names of the
associated functions to get and set those attribute values are
implementation-defined.
The behavior is undefined if the value specified by the attr
argument to pthread_condattr_destroy() does not refer to an
initialized condition variable attributes object.
Возвращаемое значение (Return value)
If successful, the pthread_condattr_destroy() and
pthread_condattr_init() functions shall return zero; otherwise,
an error number shall be returned to indicate the error.
Ошибки (Error)
The pthread_condattr_init() function shall fail if:
ENOMEM Insufficient memory exists to initialize the condition
variable attributes object.
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)
A process-shared attribute has been defined for condition
variables for the same reason it has been defined for mutexes.
If an implementation detects that the value specified by the attr
argument to pthread_condattr_destroy() does not refer to an
initialized condition variable attributes object, it is
recommended that the function should fail and report an [EINVAL]
error.
See also pthread_attr_destroy(3p) and pthread_mutex_destroy(3p).
Будущие направления (Future directions)
None.
Смотри также (See also)
pthread_attr_destroy(3p), pthread_cond_destroy(3p),
pthread_condattr_getpshared(3p), pthread_create(3p),
pthread_mutex_destroy(3p)
The Base Definitions volume of POSIX.1‐2017, pthread.h(0p)
