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diff --git a/libstdc++-v3/config/os/irix/atomicity.h b/libstdc++-v3/config/os/irix/atomicity.h
new file mode 100644
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+++ b/libstdc++-v3/config/os/irix/atomicity.h
@@ -0,0 +1,38 @@
+// Low-level functions for atomic operations: IRIX version  -*- C++ -*-
+
+// Copyright (C) 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 <mutex.h>
+#include <ext/atomicity.h>
+
+_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
+
+  _Atomic_word
+  __exchange_and_add(volatile _Atomic_word* __mem, int __val)
+  { return (_Atomic_word) test_then_add((unsigned long*) const_cast<_Atomic_word*>(__mem), __val); }
+
+  void
+  __atomic_add(volatile _Atomic_word* __mem, int __val)
+  { __exchange_and_add(__mem, __val); }
+
+_GLIBCXX_END_NAMESPACE