pthread_barrierattr_getpshared

       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 mem-
       ory  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 asso-
       ciated  functions to get and set those attribute values are implementa-
       tion-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:

APPLICATION USAGE
       The   pthread_barrierattr_getpshared()   and  pthread_barrierattr_setp-
       shared() functions are part of the Barriers option and need not be pro-
       vided 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 .



IEEE/The Open Group                  2003    PTHREAD_BARRIERATTR_GETPSHARED(P)