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PTHREAD_RWLOCKATTR_DESTROY(P)	    POSIX Programmer's Manual	    PTHREAD_RWLOCKATTR_DESTROY(P)

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_rwlock-
       attr_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 implementa-
       tion.

       Results are undefined if pthread_rwlockattr_init() is called specifying	an  already  ini-
       tialized 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_setp-
       shared() , 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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003		    PTHREAD_RWLOCKATTR_DESTROY(P)
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