pthread_rwlockattr_init

       tialize 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 initial-
       ized read-write locks.

RETURN VALUE
       If  successful,  the  pthread_rwlockattr_destroy()  and pthread_rwlock-
       attr_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

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 .



IEEE/The Open Group                  2003        PTHREAD_RWLOCKATTR_DESTROY(P)