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.
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_destroy() function may fail if:
EINVAL The value specified by attr is invalid.
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
None.
FUTURE DIRECTIONS
None.
SEE ALSO
pthread_rwlock_destroy() , pthread_rwlockattr_getpshared() ,
pthread_rwlockattr_setpshared() , the Base Definitions volume of
IEEE Std 1003.1-2001, <pthread.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 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 .