1 files changed, 54 insertions, 0 deletions
diff --git a/libstdc++/config/cpu/i486/atomicity.h b/libstdc++/config/cpu/i486/atomicity.h
new file mode 100644
index 0000000..4d8f652
--- /dev/null
+++ b/libstdc++/config/cpu/i486/atomicity.h
@@ -0,0 +1,54 @@
+// Low-level functions for atomic operations: x86, x >= 4 version  -*- C++ -*-
+
+// Copyright (C) 1999, 2000, 2001, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// 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.
+
+#include <ext/atomicity.h>
+
+_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
+
+  _Atomic_word 
+  __attribute__ ((__unused__))
+  __exchange_and_add(volatile _Atomic_word* __mem, int __val)
+  {
+    register _Atomic_word __result;
+    __asm__ __volatile__ ("lock; xadd{l} {%0,%1|%1,%0}"
+			  : "=r" (__result), "=m" (*__mem) 
+			  : "0" (__val), "m" (*__mem));
+    return __result;
+  }
+  
+  void
+  __attribute__ ((__unused__))
+  __atomic_add(volatile _Atomic_word* __mem, int __val)
+  {
+    __asm__ __volatile__ ("lock; add{l} {%1,%0|%0,%1}"
+			  : "=m" (*__mem) : "ir" (__val), "m" (*__mem));
+  }
+
+_GLIBCXX_END_NAMESPACE
+