PTHREAD_RWLOCKATTR_DESTROY(3P)                      POSIX Programmer's Manual                     PTHREAD_RWLOCKATTR_DESTROY(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

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 affect-
       ing 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, Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                PTHREAD_RWLOCKATTR_DESTROY(3P)