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PTHREAD_CONDATTR_DESTROY(3PPOSIX Programmer's ManuPTHREAD_CONDATTR_DESTROY(3P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult 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  initial-
       ize 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 vari-
       able 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 vari-
       able 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  initial-
       ize  one  or  more  condition  variables,  any  function  affecting the
       attributes object (including destruction) shall not affect  any  previ-
       ously 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 asso-
       ciated  functions to get and set those attribute values are implementa-
       tion-defined.
RETURN VALUE
       If  successful,   the   pthread_condattr_destroy()   and   pthread_con-
       dattr_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_getp-
       shared(),  pthread_create(),  pthread_mutex_destroy(), the Base Defini-
       tions 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(3P)