Implement PThreads barriers and barrier attributes.

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+.\" Copyright (c) 2004 Michael Telahun Makonnen
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.\" Note: The date here should be updated whenever a non-trivial
+.\" change is made to the manual page.
+.Dd February 19, 2004
+.Dt PTHREAD_BARRIERATTR_DESTROY 3 PTHREAD_BARRIERATTR_GETPSHARED 3 PTHREAD_BARRIERATTR_INIT 3 PTHREAD_BARRIERATTR_SETPSHARED 3
+.Os
+.Sh NAME
+.Nm pthread_barrierattr_destroy pthread_barrierattr_getpshared
+.Nm pthread_barrierattr_init pthread_barrierattr_setpshared
+.Nd "manipulate a barrier attribute object"
+.Sh LIBRARY
+.Lb libpthread
+.Lb libthr
+.Sh SYNOPSIS
+.In pthread.h
+.Ft int
+.Fn pthread_barrierattr_destroy "pthread_barrierattr_t *attr"
+.Ft int
+.Fn pthread_barrierattr_getpshared "const pthread_barrierattr_t *attr" "int *pshared"
+.Ft int
+.Fn pthread_barrierattr_init "pthread_barrierattr_t *attr"
+.Ft int
+.Fn pthread_barrierattr_setpshared "pthread_barrierattr_t *attr" "int pshared"
+.Sh DESCRIPTION
+The
+.Fn pthread_barrierattr_init
+function will initialize
+.Fa attr
+with default attributes.
+The
+.Fn pthread_barrierattr_destroy
+function will destroy
+.Fa attr
+and release any resources that may have been allocated on its behalf.
+.Pp
+The
+.Fn pthread_barrierattr_getpshared
+function will put the value of the process-shared attribute from
+.Fa attr
+into the memory area pointed to by
+.Fa pshared .
+The
+.Fn pthread_barrierattr_setpshared
+function will set the process-shared attribute of
+.Fa attr
+to the value specified in
+.Fa pshared.
+The argument
+.Fa pshared
+may have one of the following values:
+.Bl -tag -width ".Dv PTHREAD_PROCESS_PRIVATE"
+.It Dv PTHREAD_PROCESS_PRIVATE
+The barrier object it is attached to may only be accessed by
+threads in the same process as the one that created the object.
+.It Dv PTHREAD_PROCESS_SHARED
+The barrier object it is attached to may be accessed by
+threads in processes other than the one that created the object.
+.El
+.Sh DIAGNOSTICS
+If successful all these functions will return zero.
+Otherwise an error number will be returned to indicate the error.
+.Pp
+None of these functions will return EINTR.
+.Pp
+.Sh ERRORS
+The
+.Fn pthread_barrierattr_destroy ,
+.Fn pthread_barrierattr_getpshared
+and
+.Fn pthread_barrierattr_setpshared
+functions may fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The value specified by
+.Fa attr
+is invalid.
+.El
+.Pp
+The
+.Fn pthread_barrierattr_init
+function will fail if:
+.Bl -tag -width Er
+.It Bq Er ENOMEM
+Insufficient memory to initialize the barrier attribute object
+.Fa attr .
+.El
+.Pp
+The
+.Fn pthread_barrierattr_setpshared
+function will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The value specified in
+.Fa pshared
+is not one of the allowed values.
+.El
+.Sh SEE ALSO
+.Xr pthread_barrier_destroy 3 ,
+.Xr pthread_barrier_init 3 ,
+.Xr pthread_barrier_wait 3 ,
+.Sh HISTORY
+The
+.Fn pthread_barrierattr
+functions first appeared in
+.Lb libpthread
+in
+.Fx 5.2 ,
+and in
+.Lb libthr
+in
+.Fx 5.3 .
+.Sh BUGS
+The implementation of
+.Fn pthread_barriers
+does not fully conform to
+.St -p1003.2
+because the process-shared attribute is ignored in
+.Lb libthr ,
+and in
+.Lb libpthread
+if any value other than
+.Dv PTHREAD_PROCESSES_PRIVATE
+is specified in a call to
+.Fn pthread_barrierattr_setpshared
+it will return EINVAL.