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_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 Technol-
       ogy -- 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)