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 (consult the correspond-
       ing 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 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 implemen-
       tation-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 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 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_CONDATTR_DESTROY(3P)