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 .

IEEE/The Open Group                                   2003                     PTHREAD_BARRIERATTR_GETPSHARED(P)