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  otherwise  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, 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_CONDATTR_DESTROY(P)