общий атрибут объекта атрибутов блокировки чтения и записи (shared attribute of the read-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_getpshared, pthread_rwlockattr_setpshared —
get and set the process-shared attribute of the read-write lock
attributes object
Синопсис (Synopsis)
#include <pthread.h>
int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t
*restrict attr, int *restrict pshared);
int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr,
int pshared);
Описание (Description)
The pthread_rwlockattr_getpshared() function shall obtain the
value of the process-shared attribute from the initialized
attributes object referenced by attr. The
pthread_rwlockattr_setpshared() function shall set the process-
shared attribute in an initialized attributes object referenced
by attr.
The process-shared attribute shall be set to
PTHREAD_PROCESS_SHARED to permit a read-write lock to be operated
upon by any thread that has access to the memory where the read-
write lock is allocated, even if the read-write lock is allocated
in memory that is shared by multiple processes. See Section
2.9.9, Synchronization Object Copies and Alternative Mappings for
further requirements. The default value of the process-shared
attribute shall be PTHREAD_PROCESS_PRIVATE.
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_rwlockattr_getpshared() or
pthread_rwlockattr_setpshared() does not refer to an initialized
read-write lock attributes object.
Возвращаемое значение (Return value)
Upon successful completion, the pthread_rwlockattr_getpshared()
function shall return zero and store the value of the process-
shared attribute of attr into the object referenced by the
pshared parameter. Otherwise, an error number shall be returned
to indicate the error.
If successful, the pthread_rwlockattr_setpshared() function shall
return zero; otherwise, an error number shall be returned to
indicate the error.
Ошибки (Error)
The pthread_rwlockattr_setpshared() function may fail if:
EINVAL The new value specified for the attribute is outside the
range of legal values for that attribute.
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)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
pthread_rwlock_destroy(3p), pthread_rwlockattr_destroy(3p)
The Base Definitions volume of POSIX.1‐2017, pthread.h(0p)
