Module Name: src
Committed By: jruoho
Date: Fri Dec 17 07:10:38 UTC 2010
Modified Files:
src/distrib/sets/lists/comp: mi
src/share/man/man3: Makefile cdefs.3
Added Files:
src/share/man/man3: __insn_barrier.3
Log Message:
Add __insn_barrier(3). XXX: Someone more knowledgeable may want to check this.
To generate a diff of this commit:
cvs rdiff -u -r1.1551 -r1.1552 src/distrib/sets/lists/comp/mi
cvs rdiff -u -r1.61 -r1.62 src/share/man/man3/Makefile
cvs rdiff -u -r0 -r1.1 src/share/man/man3/__insn_barrier.3
cvs rdiff -u -r1.1 -r1.2 src/share/man/man3/cdefs.3
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/distrib/sets/lists/comp/mi
diff -u src/distrib/sets/lists/comp/mi:1.1551 src/distrib/sets/lists/comp/mi:1.1552
--- src/distrib/sets/lists/comp/mi:1.1551 Thu Dec 16 23:01:56 2010
+++ src/distrib/sets/lists/comp/mi Fri Dec 17 07:10:37 2010
@@ -1,4 +1,4 @@
-# $NetBSD: mi,v 1.1551 2010/12/16 23:01:56 joerg Exp $
+# $NetBSD: mi,v 1.1552 2010/12/17 07:10:37 jruoho Exp $
#
# Note: don't delete entries from here - mark them as "obsolete" instead.
#
@@ -4910,6 +4910,7 @@
./usr/share/man/cat3/__builtin_object_size.0 comp-c-catman .cat
./usr/share/man/cat3/__constfunc.0 comp-c-catman .cat
./usr/share/man/cat3/__dead.0 comp-c-catman .cat
+./usr/share/man/cat3/__insn_barrier.0 comp-c-catman .cat
./usr/share/man/cat3/__noinline.0 comp-c-catman .cat
./usr/share/man/cat3/__packed.0 comp-c-catman .cat
./usr/share/man/cat3/__pure.0 comp-c-catman .cat
@@ -10994,6 +10995,7 @@
./usr/share/man/html3/__builtin_object_size.html comp-c-htmlman html
./usr/share/man/html3/__constfunc.html comp-c-htmlman html
./usr/share/man/html3/__dead.html comp-c-htmlman html
+./usr/share/man/html3/__insn_barrier.html comp-c-htmlman html
./usr/share/man/html3/__noinline.html comp-c-htmlman html
./usr/share/man/html3/__packed.html comp-c-htmlman html
./usr/share/man/html3/__pure.html comp-c-htmlman html
@@ -16878,6 +16880,7 @@
./usr/share/man/man3/__builtin_object_size.3 comp-c-man .man
./usr/share/man/man3/__constfunc.3 comp-c-man .man
./usr/share/man/man3/__dead.3 comp-c-man .man
+./usr/share/man/man3/__insn_barrier.3 comp-c-man .man
./usr/share/man/man3/__noinline.3 comp-c-man .man
./usr/share/man/man3/__packed.3 comp-c-man .man
./usr/share/man/man3/__pure.3 comp-c-man .man
Index: src/share/man/man3/Makefile
diff -u src/share/man/man3/Makefile:1.61 src/share/man/man3/Makefile:1.62
--- src/share/man/man3/Makefile:1.61 Thu Dec 16 17:47:54 2010
+++ src/share/man/man3/Makefile Fri Dec 17 07:10:38 2010
@@ -1,8 +1,9 @@
-# $NetBSD: Makefile,v 1.61 2010/12/16 17:47:54 jruoho Exp $
+# $NetBSD: Makefile,v 1.62 2010/12/17 07:10:38 jruoho Exp $
# @(#)Makefile 8.2 (Berkeley) 12/13/93
MAN= _DIAGASSERT.3 __CONCAT.3 __UNCONST.3 CMSG_DATA.3 \
- __arraycount.3 assert.3 attribute.3 bits.3 bitstring.3 \
+ __arraycount.3 __insn_barrier.3 \
+ assert.3 attribute.3 bits.3 bitstring.3 \
cdefs.3 dirent.3 dlfcn.3 dl_iterate_phdr.3 end.3 \
fast_divide32.3 ffs32.3 gcq.3 \
ilog2.3 intro.3 inttypes.3 iso646.3 \
Index: src/share/man/man3/cdefs.3
diff -u src/share/man/man3/cdefs.3:1.1 src/share/man/man3/cdefs.3:1.2
--- src/share/man/man3/cdefs.3:1.1 Thu Dec 16 10:19:14 2010
+++ src/share/man/man3/cdefs.3 Fri Dec 17 07:10:38 2010
@@ -1,4 +1,4 @@
-.\" $NetBSD: cdefs.3,v 1.1 2010/12/16 10:19:14 jruoho Exp $
+.\" $NetBSD: cdefs.3,v 1.2 2010/12/17 07:10:38 jruoho Exp $
.\"
.\" Copyright (c) 2010 The NetBSD Foundation, Inc.
.\" All rights reserved.
@@ -27,7 +27,7 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
-.Dd December 16, 2010
+.Dd December 17, 2010
.Dt CDEFS 3
.Os
.Sh NAME
@@ -54,10 +54,11 @@
.Tn C99 .
.It
Macros and definitions specific to compilers, preprocessors, and linkers; see
-.Xr attribute 3 ,
.Xr __CONCAT 3 ,
+.Xr __UNCONST 3 ,
+.Xr __insn_barrier 3 ,
and
-.Xr __UNCONST 3 .
+.Xr attribute 3 .
.It
Utility macros provided for convenience; see
.Xr __arraycount 3
@@ -87,7 +88,7 @@
*/
#include <sys/cdefs.h>
-__RCSID("$NetBSD: cdefs.3,v 1.1 2010/12/16 10:19:14 jruoho Exp $");
+__RCSID("$NetBSD: cdefs.3,v 1.2 2010/12/17 07:10:38 jruoho Exp $");
.Ed
.Pp
It is possible to identify the
Added files:
Index: src/share/man/man3/__insn_barrier.3
diff -u /dev/null src/share/man/man3/__insn_barrier.3:1.1
--- /dev/null Fri Dec 17 07:10:38 2010
+++ src/share/man/man3/__insn_barrier.3 Fri Dec 17 07:10:38 2010
@@ -0,0 +1,64 @@
+.\" $NetBSD: __insn_barrier.3,v 1.1 2010/12/17 07:10:38 jruoho Exp $
+.\"
+.\" Copyright (c) 2010 Jukka Ruohonen <jruoho...@iki.fi>
+.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd December 17, 2010
+.Dt __INSN_BARRIER 3
+.Os
+.Sh NAME
+.Nm __insn_barrier
+.Nd compiler reorder barrier
+.Sh SYNOPSIS
+.In sys/cdefs.h
+.Ft void
+.Fn __insn_barrier
+.Sh DESCRIPTION
+The
+.Fn __insn_barrier
+macro prevents
+.Tn GCC
+from moving code across the barrier.
+In other words, the compiler is not allowed to reorder read and write
+commands below the barrier with the code preceding the barrier.
+Like with the
+.Em volatile
+type qualifier,
+.Fn __insn_barrier
+may be necessary in some corner cases to prevent the compiler
+from misoptimizing.
+.Sh SEE ALSO
+.Xr gcc 1 ,
+.Xr cdefs 3
+.Rs
+.%A Paul E. McKenney
+.%T Memory Barriers: a Hardware View for Software Hackers
+.%D June 7, 2010
+.%U http://www.rdrop.com/users/paulmck/scalability/paper/whymb.2010.06.07c.pdf
+.Re
+.Sh HISTORY
+The
+.Fn __insn_barrier
+macro first appeared in
+.Nx 2.0 .
