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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>


       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 .