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 .

IEEE/The Open Group                                   2017                   PTHREAD_BARRIERATTR_DESTROY(3POSIX)