запись объекта атрибутов блокировки (write lock 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_rwlockattr_destroy, pthread_rwlockattr_init — destroy and
initialize the read-write lock attributes object
Синопсис (Synopsis)
#include <pthread.h>
int pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr);
int pthread_rwlockattr_init(pthread_rwlockattr_t *attr);
Описание (Description)
The pthread_rwlockattr_destroy() function shall destroy a read-
write lock attributes object. A destroyed attr attributes object
can be reinitialized using pthread_rwlockattr_init(); the results
of otherwise referencing the object after it has been destroyed
are undefined. An implementation may cause
pthread_rwlockattr_destroy() to set the object referenced by attr
to an invalid value.
The pthread_rwlockattr_init() function shall initialize a read-
write lock attributes object attr with the default value for all
of the attributes defined by the implementation.
Results are undefined if pthread_rwlockattr_init() is called
specifying an already initialized attr attributes object.
After a read-write lock attributes object has been used to
initialize one or more read-write locks, any function affecting
the attributes object (including destruction) shall not affect
any previously initialized read-write locks.
The behavior is undefined if the value specified by the attr
argument to pthread_rwlockattr_destroy() does not refer to an
initialized read-write lock attributes object.
Возвращаемое значение (Return value)
If successful, the pthread_rwlockattr_destroy() and
pthread_rwlockattr_init() functions shall return zero; otherwise,
an error number shall be returned to indicate the error.
Ошибки (Error)
The pthread_rwlockattr_init() function shall fail if:
ENOMEM Insufficient memory exists to initialize the read-write
lock 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)
If an implementation detects that the value specified by the attr
argument to pthread_rwlockattr_destroy() does not refer to an
initialized read-write lock 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_rwlock_destroy(3p), pthread_rwlockattr_getpshared(3p)
The Base Definitions volume of POSIX.1‐2017, pthread.h(0p)
