Imported gcc-4.4.3

[msp430-gcc.git] / libstdc++-v3 / config / cpu / generic / atomicity_mutex / atomicity.h

diff --git a/libstdc++-v3/config/cpu/generic/atomicity_mutex/atomicity.h b/libstdc++-v3/config/cpu/generic/atomicity_mutex/atomicity.h
new file mode 100644 (file)
index 0000000..d8a5245
--- /dev/null
+++ b/libstdc++-v3/config/cpu/generic/atomicity_mutex/atomicity.h
@@ -0,0 +1,61 @@
+// Low-level functions for atomic operations: Generic version  -*- C++ -*-
+
+// Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005, 2006, 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/>.
+
+/** @file ext/atomicity.h
+ *  This file is a GNU extension to the Standard C++ Library.
+ */
+
+#include <ext/atomicity.h>
+#include <ext/concurrence.h>
+
+namespace 
+{
+  __gnu_cxx::__mutex&
+  get_atomic_mutex()
+  {
+    static __gnu_cxx::__mutex atomic_mutex;
+    return atomic_mutex;
+  }
+} // anonymous namespace
+
+_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
+
+  _Atomic_word
+  __attribute__ ((__unused__))
+  __exchange_and_add(volatile _Atomic_word* __mem, int __val)
+  {
+    __gnu_cxx::__scoped_lock sentry(get_atomic_mutex());
+    _Atomic_word __result;
+    __result = *__mem;
+    *__mem += __val;
+    return __result;
+  }
+
+  void
+  __attribute__ ((__unused__))
+  __atomic_add(volatile _Atomic_word* __mem, int __val)
+  { __exchange_and_add(__mem, __val); }
+
+_GLIBCXX_END_NAMESPACE