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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>


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 .