1 files changed, 56 insertions, 0 deletions
diff --git a/libstdc++-v3/config/os/aix/atomicity.h b/libstdc++-v3/config/os/aix/atomicity.h
new file mode 100644
index 000000000..1bd51f1c0
--- /dev/null
+++ b/libstdc++-v3/config/os/aix/atomicity.h
@@ -0,0 +1,56 @@
+// Low-level functions for atomic operations: AIX version  -*- C++ -*-
+
+// Copyright (C) 2000, 2001, 2004, 2005, 2009 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 3, 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.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+#include <ext/atomicity.h>
+
+/* We cannot use the cpu/powerpc/bits/atomicity.h inline assembly
+   definitions for these operations since they depend on operations
+   that are not available on the original POWER architecture.  AIX
+   still runs on the POWER architecture, so it would be incorrect to
+   assume the existence of these instructions.
+
+   The definition of _Atomic_word must match the type pointed to by
+   atomic_p in <sys/atomic_op.h>.  */
+
+extern "C"
+{
+#include <sys/atomic_op.h>
+}
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  _Atomic_word
+  __attribute__ ((__unused__))
+  __exchange_and_add (volatile _Atomic_word* __mem, int __val) throw ()
+  { return ::fetch_and_add(const_cast<atomic_p>(__mem), __val); }
+
+  void
+  __attribute__ ((__unused__))
+  __atomic_add (volatile _Atomic_word* __mem, int __val) throw ()
+  { (void) ::fetch_and_add(const_cast<atomic_p>(__mem), __val); }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace