NAME

       pthread_barrierattr_getpshared,   pthread_barrierattr_setpshared   -   get   and  set  the
       process-shared attribute of the barrier attributes object (ADVANCED REALTIME THREADS)

SYNOPSIS

       #include <pthread.h>

       int pthread_barrierattr_getpshared(const pthread_barrierattr_t *
              restrict attr, int *restrict pshared);
       int pthread_barrierattr_setpshared(pthread_barrierattr_t *attr,
              int pshared);

DESCRIPTION

       The pthread_barrierattr_getpshared() function shall obtain the value of the process-shared
       attribute     from     the     attributes     object     referenced     by    attr.    The
       pthread_barrierattr_setpshared() function shall set the  process-shared  attribute  in  an
       initialized attributes object referenced by attr.

       The  process-shared  attribute  is set to PTHREAD_PROCESS_SHARED to permit a barrier to be
       operated upon by any thread that has access to the memory where the barrier is  allocated.
       If  the  process-shared  attribute  is  PTHREAD_PROCESS_PRIVATE, the barrier shall only be
       operated upon by threads created within the same process as the  thread  that  initialized
       the  barrier;  if threads of different processes attempt to operate on such a barrier, the
       behavior   is   undefined.   The   default   value   of    the    attribute    shall    be
       PTHREAD_PROCESS_PRIVATE. Both constants PTHREAD_PROCESS_SHARED and PTHREAD_PROCESS_PRIVATE
       are defined in <pthread.h>.

       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_barrierattr_getpshared() function shall return zero and store
       the value of the process-shared attribute of  attr  into  the  object  referenced  by  the
       pshared parameter. Otherwise, an error number shall be returned to indicate the error.

       If successful, the pthread_barrierattr_setpshared() function shall return zero; otherwise,
       an error number shall be returned to indicate the error.

ERRORS

       These functions may fail if:

       EINVAL The value specified by attr is invalid.

       The pthread_barrierattr_setpshared() function may fail if:

       EINVAL The new value specified for the process-shared attribute is not one  of  the  legal
              values PTHREAD_PROCESS_SHARED or PTHREAD_PROCESS_PRIVATE.

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

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       The  pthread_barrierattr_getpshared()  and  pthread_barrierattr_setpshared() functions are
       part of the Barriers option and need not be provided on all implementations.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       pthread_barrier_destroy() , pthread_barrierattr_destroy() ,  pthread_barrierattr_init()  ,
       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 .