PTHREAD_RWLOCKATTR_DESTROY
Section: POSIX Programmer's Manual (3P)
Updated: 2017
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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.
NAME
pthread_rwlockattr_destroy,
pthread_rwlockattr_init
--- destroy and initialize the read-write lock attributes object
SYNOPSIS
#include <pthread.h>
int pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr);
int pthread_rwlockattr_init(pthread_rwlockattr_t *attr);
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.
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.
ERRORS
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.
EXAMPLES
None.
APPLICATION USAGE
None.
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.
FUTURE DIRECTIONS
None.
SEE ALSO
pthread_rwlock_destroy(),
pthread_rwlockattr_getpshared()
The Base Definitions volume of POSIX.1-2017,
<pthread.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
In the event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear
in this page are most likely
to have been introduced during the conversion of the source files to
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https://www.kernel.org/doc/man-pages/reporting_bugs.html .