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_barrierattr_destroy, pthread_barrierattr_init — destroy and initialize the barrier
       attributes object

SYNOPSIS

       #include <pthread.h>

       int pthread_barrierattr_destroy(pthread_barrierattr_t *attr);
       int pthread_barrierattr_init(pthread_barrierattr_t *attr);

DESCRIPTION

       The pthread_barrierattr_destroy() function shall destroy a barrier  attributes  object.  A
       destroyed  attr  attributes  object can be reinitialized using pthread_barrierattr_init();
       the results of otherwise referencing the object after it has been destroyed are undefined.
       An  implementation may cause pthread_barrierattr_destroy() to set the object referenced by
       attr to an invalid value.

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

       If  pthread_barrierattr_init() is called specifying an already initialized attr attributes
       object, the results are undefined.

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

       The  behavior  is  undefined  if  the  value   specified   by   the   attr   argument   to
       pthread_barrierattr_destroy() does not refer to an initialized barrier attributes object.

RETURN VALUE

       If  successful, the pthread_barrierattr_destroy() and pthread_barrierattr_init() functions
       shall return zero; otherwise, an error number shall be returned to indicate the error.

ERRORS

       The pthread_barrierattr_init() function shall fail if:

       ENOMEM Insufficient memory exists to initialize the barrier attributes object.

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

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       If  an  implementation  detects  that  the  value  specified  by  the  attr  argument   to
       pthread_barrierattr_destroy()  does not refer to an initialized barrier attributes object,
       it is recommended that the function should fail and report an [EINVAL] error.

FUTURE DIRECTIONS

       None.

SEE ALSO

       pthread_barrierattr_getpshared()

       The Base Definitions volume of POSIX.1‐2017, <pthread.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1-2017,  Standard  for  Information Technology -- Portable Operating System Interface
       (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C)  2018  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 .

       Any typographical or formatting errors that appear in this page are most  likely  to  have
       been  introduced  during  the conversion of the source files to man page format. To report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .