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diff --git a/cutl/details/boost/smart_ptr/detail/spinlock_gcc_arm.hpp b/cutl/details/boost/smart_ptr/detail/spinlock_gcc_arm.hpp
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+#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ARM_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ARM_HPP_INCLUDED
+
+//
+// Copyright (c) 2008 Peter Dimov
+//
+// Distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#include <cutl/details/boost/smart_ptr/detail/yield_k.hpp>
+
+namespace cutl_details_boost
+{
+
+namespace detail
+{
+
+class spinlock
+{
+public:
+
+ int v_;
+
+public:
+
+ bool try_lock()
+ {
+ int r;
+
+ __asm__ __volatile__(
+ "swp %0, %1, [%2]":
+ "=&r"( r ): // outputs
+ "r"( 1 ), "r"( &v_ ): // inputs
+ "memory", "cc" );
+
+ return r == 0;
+ }
+
+ void lock()
+ {
+ for( unsigned k = 0; !try_lock(); ++k )
+ {
+ cutl_details_boost::detail::yield( k );
+ }
+ }
+
+ void unlock()
+ {
+ __asm__ __volatile__( "" ::: "memory" );
+ *const_cast< int volatile* >( &v_ ) = 0;
+ }
+
+public:
+
+ class scoped_lock
+ {
+ private:
+
+ spinlock & sp_;
+
+ scoped_lock( scoped_lock const & );
+ scoped_lock & operator=( scoped_lock const & );
+
+ public:
+
+ explicit scoped_lock( spinlock & sp ): sp_( sp )
+ {
+ sp.lock();
+ }
+
+ ~scoped_lock()
+ {
+ sp_.unlock();
+ }
+ };
+};
+
+} // namespace detail
+} // namespace cutl_details_boost
+
+#define BOOST_DETAIL_SPINLOCK_INIT {0}
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ARM_HPP_INCLUDED