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_getpshared,  pthread_barrierattr_setpshared — get and set the process-
       shared attribute of the barrier attributes object

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.

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

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

       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 Thread Process-Shared Synchronization option and need not be provided  on  all
       implementations.

RATIONALE

       If   an  implementation  detects  that  the  value  specified  by  the  attr  argument  to
       pthread_barrierattr_getpshared() or pthread_barrierattr_setpshared() 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_barrier_destroy(), pthread_barrierattr_destroy()

       The Base Definitions volume of POSIX.1‐2008, <pthread.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2013  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013  by  the
       Institute  of  Electrical  and  Electronics  Engineers,  Inc and The Open Group.  (This is
       POSIX.1-2008 with the  2013  Technical  Corrigendum  1  applied.)  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.unix.org/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 .