PTHREAD_CONDATTR_DESTROY(3P)                        POSIX Programmer's Manual                       PTHREAD_CONDATTR_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_condattr_destroy, pthread_condattr_init - destroy and initialize the condition variable attributes object

SYNOPSIS
       #include <pthread.h>

       int pthread_condattr_destroy(pthread_condattr_t *attr);
       int pthread_condattr_init(pthread_condattr_t *attr);


DESCRIPTION
       The  pthread_condattr_destroy()  function  shall  destroy  a condition variable attributes object; the object becomes, in
       effect, uninitialized. An implementation may cause pthread_condattr_destroy() to set the object referenced by attr to  an
       invalid value. A destroyed attr attributes object can be reinitialized using pthread_condattr_init(); the results of oth-
       erwise referencing the object after it has been destroyed are undefined.

       The pthread_condattr_init() function shall initialize a condition variable attributes object attr with the default  value
       for all of the attributes defined by the implementation.

       Results are undefined if pthread_condattr_init() is called specifying an already initialized attr attributes object.

       After  a  condition  variable attributes object has been used to initialize one or more condition variables, any function
       affecting the attributes object (including destruction) shall not affect any previously initialized condition variables.

       This volume of IEEE Std 1003.1-2001 requires two attributes, the clock attribute and the process-shared attribute.

       Additional attributes, their default values, and the names of the associated functions to get  and  set  those  attribute
       values are implementation-defined.

RETURN VALUE
       If  successful,  the  pthread_condattr_destroy()  and  pthread_condattr_init() functions shall return zero; otherwise, an
       error number shall be returned to indicate the error.

ERRORS
       The pthread_condattr_destroy() function may fail if:

       EINVAL The value specified by attr is invalid.


       The pthread_condattr_init() function shall fail if:

       ENOMEM Insufficient memory exists to initialize the condition variable attributes object.


       These functions shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       See pthread_attr_init() and pthread_mutex_init().

       A process-shared attribute has been defined for condition variables for the same reason it has been defined for mutexes.

FUTURE DIRECTIONS
       None.

SEE ALSO
       pthread_attr_destroy(), pthread_cond_destroy(), pthread_condattr_getpshared(), pthread_create(), pthread_mutex_destroy(),
       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_CONDATTR_DESTROY(3P)