configure.host (aix4*|aix5*): Add atomic_word_dir.

	* configure.host (aix4*|aix5*): Add atomic_word_dir.
	* config/os/aix/atomic_word.h: New file.

From-SVN: r92673

libstdc++-v3/ChangeLog

+2004-12-28  David Edelsohn  <edelsohn@gnu.org>
+
+	* configure.host (aix4*|aix5*): Add atomic_word_dir.
+	* config/os/aix/atomic_word.h: New file.
+
 2004-12-27  Jason Merrill  <jason@redhat.com>
 
 	Add memory barriers to the double-checked locking used for static

libstdc++-v3/config/os/aix/atomic_word.h

+// Low-level type for atomic operations -*- C++ -*-
+
+// Copyright (C) 2004 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction.  Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License.  This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+#ifndef _GLIBCXX_ATOMIC_WORD_H
+#define _GLIBCXX_ATOMIC_WORD_H	1
+
+typedef int _Atomic_word;
+
+#ifdef _ARCH_PPC
+#define _GLIBCXX_READ_MEM_BARRIER __asm __volatile ("isync":::"memory")
+#define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("sync":::"memory")
+#else
+#define _GLIBCXX_READ_MEM_BARRIER __asm __volatile ("":::"memory")
+#define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("":::"memory")
+#endif 
+
+#endif

libstdc++-v3/configure.host

@@ -155,11 +155,13 @@ case "${host_os}" in
     # explicitly duplicate the directory for 4.[<3].
     os_include_dir="os/aix"
     atomicity_dir="os/aix"
+    atomic_word_dir="os/aix"
     OPT_LDFLAGS="-Wl,-G"
     ;;
   aix4.*)
     os_include_dir="os/generic"
     atomicity_dir="os/aix"
+    atomic_word_dir="os/aix"
     ;;
   aix*)
     os_include_dir="os/generic"