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 .