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 .

IEEE/The Open Group                                   2003                         PTHREAD_RWLOCKATTR_DESTROY(P)