diff --git a/include/boost/smart_ptr/atomic_shared_ptr.hpp b/include/boost/smart_ptr/atomic_shared_ptr.hpp
new file mode 100644
index 0000000..60136e5
--- /dev/null
+++ b/include/boost/smart_ptr/atomic_shared_ptr.hpp
@@ -0,0 +1,142 @@
+#ifndef BOOST_SMART_PTR_ATOMIC_SHARED_PTR_HPP_INCLUDED
+#define BOOST_SMART_PTR_ATOMIC_SHARED_PTR_HPP_INCLUDED
+
+//
+//  atomic_shared_ptr.hpp
+//
+//  Copyright 2017 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)
+//
+//  See http://www.boost.org/libs/smart_ptr/ for documentation.
+//
+
+#include <boost/smart_ptr/shared_ptr.hpp>
+
+namespace boost
+{
+
+template<class T> class atomic_shared_ptr
+{
+private:
+
+    boost::shared_ptr<T> p_;
+
+    atomic_shared_ptr(const atomic_shared_ptr&);
+    atomic_shared_ptr& operator=(const atomic_shared_ptr&);
+
+public:
+
+    atomic_shared_ptr() BOOST_SP_NOEXCEPT
+    {
+    }
+
+    BOOST_CONSTEXPR atomic_shared_ptr( shared_ptr<T> p ) BOOST_SP_NOEXCEPT: p_( p )
+    {
+    }
+
+    atomic_shared_ptr& operator=( shared_ptr<T> r ) BOOST_SP_NOEXCEPT
+    {
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+        atomic_store( &p_, std::move( r ) );
+
+#else
+
+        atomic_store( &p_, r );
+
+#endif
+        return *this;
+    }
+
+    BOOST_CONSTEXPR bool is_lock_free() const BOOST_SP_NOEXCEPT
+    {
+        return false;
+    }
+
+    shared_ptr<T> load( int = 0 ) const BOOST_SP_NOEXCEPT
+    {
+        return atomic_load( &p_ );
+    }
+
+    operator shared_ptr<T>() const BOOST_SP_NOEXCEPT
+    {
+        return atomic_load( &p_ );
+    }
+
+    void store( shared_ptr<T> r, int = 0 ) BOOST_SP_NOEXCEPT
+    {
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+        atomic_store( &p_, std::move( r ) );
+
+#else
+
+        atomic_store( &p_, r );
+
+#endif
+    }
+
+    shared_ptr<T> exchange( shared_ptr<T> r, int = 0 ) BOOST_SP_NOEXCEPT
+    {
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+        return atomic_exchange( &p_, std::move( r ) );
+
+#else
+
+        return atomic_exchange( &p_, r );
+
+#endif
+    }
+
+    bool compare_exchange_weak( shared_ptr<T>& v, const shared_ptr<T>& w, int, int ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, w );
+    }
+
+    bool compare_exchange_weak( shared_ptr<T>& v, const shared_ptr<T>& w, int = 0 ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, w );
+    }
+
+    bool compare_exchange_strong( shared_ptr<T>& v, const shared_ptr<T>& w, int, int ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, w );
+    }
+
+    bool compare_exchange_strong( shared_ptr<T>& v, const shared_ptr<T>& w, int = 0 ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, w );
+    }
+
+#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
+
+    bool compare_exchange_weak( shared_ptr<T>& v, shared_ptr<T>&& w, int,  int ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, std::move( w ) );
+    }
+
+    bool compare_exchange_weak( shared_ptr<T>& v, shared_ptr<T>&& w, int = 0 ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, std::move( w ) );
+    }
+
+    bool compare_exchange_strong( shared_ptr<T>& v, shared_ptr<T>&& w, int, int ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, std::move( w ) );
+    }
+
+    bool compare_exchange_strong( shared_ptr<T>& v, shared_ptr<T>&& w, int = 0 ) BOOST_SP_NOEXCEPT
+    {
+        return atomic_compare_exchange( &p_, &v, std::move( w ) );
+    }
+
+#endif
+};
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_ATOMIC_SHARED_PTR_HPP_INCLUDED
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index 9235970..a6f6b0c 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -1,6 +1,6 @@
 #  Boost.SmartPtr Library test Jamfile
 #
-#  Copyright (c) 2003-2013 Peter Dimov
+#  Copyright (c) 2003-2017 Peter Dimov
 #  Copyright (c) 2003 Dave Abrahams
 #
 #  Distributed under the Boost Software License, Version 1.0. (See
@@ -211,6 +211,8 @@ import testing ;
 
           [ compile lwm_win32_cs_test.cpp ]
 
+          [ run atomic_sp_test.cpp ]
+
           [ run local_sp_test.cpp ]
           [ run lsp_array_test.cpp ]
           [ run lsp_array_n_test.cpp ]
diff --git a/test/atomic_sp_test.cpp b/test/atomic_sp_test.cpp
new file mode 100644
index 0000000..1b0b839
--- /dev/null
+++ b/test/atomic_sp_test.cpp
@@ -0,0 +1,325 @@
+#include <boost/config.hpp>
+
+//  atomic_sp_test.cpp
+//
+//  Copyright 2008, 2017 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 <boost/smart_ptr/atomic_shared_ptr.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/memory_order.hpp>
+
+//
+
+struct X
+{
+};
+
+#define BOOST_TEST_SP_EQ( p, q ) BOOST_TEST( p == q && !( p < q ) && !( q < p ) )
+
+int main()
+{
+    // default constructor
+
+    {
+        boost::atomic_shared_ptr<X> apx;
+
+        boost::shared_ptr<X> p2 = apx.load();
+
+        BOOST_TEST_EQ( p2.get(), (X*)0 );
+        BOOST_TEST_EQ( p2.use_count(), 0 );
+    }
+
+    // shared_ptr constructor
+
+    {
+        boost::shared_ptr<X> px( new X );
+        boost::atomic_shared_ptr<X> apx( px );
+
+        boost::shared_ptr<X> p2 = apx.load();
+
+        BOOST_TEST_EQ( px, p2 );
+        BOOST_TEST_EQ( px.use_count(), 3 );
+        BOOST_TEST_EQ( p2.use_count(), 3 );
+    }
+
+    // shared_ptr assignment
+
+    {
+        boost::shared_ptr<X> px0( new X );
+        boost::atomic_shared_ptr<X> apx( px0 );
+
+        boost::shared_ptr<X> px( new X );
+        apx = px;
+
+        boost::shared_ptr<X> p2 = apx.load();
+
+        BOOST_TEST_EQ( px, p2 );
+        BOOST_TEST_EQ( px.use_count(), 3 );
+        BOOST_TEST_EQ( p2.use_count(), 3 );
+    }
+
+    // load, w/ mo
+
+    {
+        boost::shared_ptr<X> px( new X );
+        boost::atomic_shared_ptr<X> apx( px );
+
+        boost::shared_ptr<X> p2 = apx.load( boost::memory_order_acquire );
+
+        BOOST_TEST_EQ( px, p2 );
+        BOOST_TEST_EQ( px.use_count(), 3 );
+        BOOST_TEST_EQ( p2.use_count(), 3 );
+    }
+
+    // operator shared_ptr
+
+    {
+        boost::shared_ptr<X> px( new X );
+        boost::atomic_shared_ptr<X> apx( px );
+
+        boost::shared_ptr<X> p2 = apx;
+
+        BOOST_TEST_EQ( px, p2 );
+        BOOST_TEST_EQ( px.use_count(), 3 );
+        BOOST_TEST_EQ( p2.use_count(), 3 );
+    }
+
+    // store
+
+    {
+        boost::shared_ptr<X> px0( new X );
+        boost::atomic_shared_ptr<X> apx( px0 );
+
+        boost::shared_ptr<X> px( new X );
+        apx.store( px );
+
+        boost::shared_ptr<X> p2 = apx.load();
+
+        BOOST_TEST_EQ( px, p2 );
+        BOOST_TEST_EQ( px.use_count(), 3 );
+        BOOST_TEST_EQ( p2.use_count(), 3 );
+    }
+
+    // store, w/ mo
+
+    {
+        boost::shared_ptr<X> px0( new X );
+        boost::atomic_shared_ptr<X> apx( px0 );
+
+        boost::shared_ptr<X> px( new X );
+        apx.store( px, boost::memory_order_release );
+
+        boost::shared_ptr<X> p2 = apx.load();
+
+        BOOST_TEST_EQ( px, p2 );
+        BOOST_TEST_EQ( px.use_count(), 3 );
+        BOOST_TEST_EQ( p2.use_count(), 3 );
+    }
+
+    // exchange
+
+    {
+        boost::shared_ptr<X> px0( new X );
+        boost::atomic_shared_ptr<X> apx( px0 );
+
+        boost::shared_ptr<X> px( new X );
+        boost::shared_ptr<X> p1 = apx.exchange( px );
+
+        BOOST_TEST_EQ( px0, p1 );
+        BOOST_TEST_EQ( px0.use_count(), 2 );
+        BOOST_TEST_EQ( p1.use_count(), 2 );
+
+        boost::shared_ptr<X> p2 = apx.load();
+
+        BOOST_TEST_EQ( px, p2 );
+        BOOST_TEST_EQ( px.use_count(), 3 );
+        BOOST_TEST_EQ( p2.use_count(), 3 );
+    }
+
+    // exchange, w/ mo
+
+    {
+        boost::shared_ptr<X> px0( new X );
+        boost::atomic_shared_ptr<X> apx( px0 );
+
+        boost::shared_ptr<X> px( new X );
+        boost::shared_ptr<X> p1 = apx.exchange( px, boost::memory_order_acq_rel );
+
+        BOOST_TEST_EQ( px0, p1 );
+        BOOST_TEST_EQ( px0.use_count(), 2 );
+        BOOST_TEST_EQ( p1.use_count(), 2 );
+
+        boost::shared_ptr<X> p2 = apx.load();
+
+        BOOST_TEST_EQ( px, p2 );
+        BOOST_TEST_EQ( px.use_count(), 3 );
+        BOOST_TEST_EQ( p2.use_count(), 3 );
+    }
+
+    // compare_exchange_weak
+
+    {
+        boost::shared_ptr<X> px( new X );
+        boost::atomic_shared_ptr<X> apx( px );
+
+        boost::shared_ptr<X> px2( new X );
+        boost::shared_ptr<X> cmp;
+
+        bool r = apx.compare_exchange_weak( cmp, px2 );
+        BOOST_TEST( !r );
+        BOOST_TEST_SP_EQ( apx.load(), px );
+        BOOST_TEST_SP_EQ( cmp, px );
+
+        r = apx.compare_exchange_weak( cmp, px2 );
+        BOOST_TEST( r );
+        BOOST_TEST_SP_EQ( apx.load(), px2 );
+    }
+
+    // compare_exchange_weak, w/ mo
+
+    {
+        boost::shared_ptr<X> px( new X );
+        boost::atomic_shared_ptr<X> apx( px );
+
+        boost::shared_ptr<X> px2( new X );
+        boost::shared_ptr<X> cmp;
+
+        bool r = apx.compare_exchange_weak( cmp, px2, boost::memory_order_seq_cst, boost::memory_order_seq_cst );
+        BOOST_TEST( !r );
+        BOOST_TEST_SP_EQ( apx.load(), px );
+        BOOST_TEST_SP_EQ( cmp, px );
+
+        r = apx.compare_exchange_weak( cmp, px2, boost::memory_order_seq_cst, boost::memory_order_seq_cst );
+        BOOST_TEST( r );
+        BOOST_TEST_SP_EQ( apx.load(), px2 );
+    }
+
+    // compare_exchange_weak, rv
+
+    {
+        boost::shared_ptr<X> px( new X );
+        boost::atomic_shared_ptr<X> apx( px );
+
+        boost::shared_ptr<X> cmp;
+
+        bool r = apx.compare_exchange_weak( cmp, boost::shared_ptr<X>() );
+
+        BOOST_TEST( !r );
+        BOOST_TEST_SP_EQ( apx.load(), px );
+        BOOST_TEST_SP_EQ( cmp, px );
+
+        r = apx.compare_exchange_weak( cmp, boost::shared_ptr<X>() );
+
+        BOOST_TEST( r );
+        BOOST_TEST( apx.load().get() == 0 );
+        BOOST_TEST( apx.load().use_count() == 0 );
+    }
+
+    // compare_exchange_weak, rv, w/ mo
+
+    {
+        boost::shared_ptr<X> px( new X );
+        boost::atomic_shared_ptr<X> apx( px );
+
+        boost::shared_ptr<X> cmp;
+
+        bool r = apx.compare_exchange_weak( cmp, boost::shared_ptr<X>(), boost::memory_order_seq_cst, boost::memory_order_seq_cst );
+
+        BOOST_TEST( !r );
+        BOOST_TEST_SP_EQ( apx.load(), px );
+        BOOST_TEST_SP_EQ( cmp, px );
+
+        r = apx.compare_exchange_weak( cmp, boost::shared_ptr<X>(), boost::memory_order_seq_cst, boost::memory_order_seq_cst );
+
+        BOOST_TEST( r );
+        BOOST_TEST( apx.load().get() == 0 );
+        BOOST_TEST( apx.load().use_count() == 0 );
+    }
+
+    // compare_exchange_strong
+
+    {
+        boost::shared_ptr<X> px( new X );
+        boost::atomic_shared_ptr<X> apx( px );
+
+        boost::shared_ptr<X> px2( new X );
+        boost::shared_ptr<X> cmp;
+
+        bool r = apx.compare_exchange_strong( cmp, px2 );
+        BOOST_TEST( !r );
+        BOOST_TEST_SP_EQ( apx.load(), px );
+        BOOST_TEST_SP_EQ( cmp, px );
+
+        r = apx.compare_exchange_strong( cmp, px2 );
+        BOOST_TEST( r );
+        BOOST_TEST_SP_EQ( apx.load(), px2 );
+    }
+
+    // compare_exchange_strong, w/ mo
+
+    {
+        boost::shared_ptr<X> px( new X );
+        boost::atomic_shared_ptr<X> apx( px );
+
+        boost::shared_ptr<X> px2( new X );
+        boost::shared_ptr<X> cmp;
+
+        bool r = apx.compare_exchange_strong( cmp, px2, boost::memory_order_seq_cst, boost::memory_order_seq_cst );
+        BOOST_TEST( !r );
+        BOOST_TEST_SP_EQ( apx.load(), px );
+        BOOST_TEST_SP_EQ( cmp, px );
+
+        r = apx.compare_exchange_strong( cmp, px2, boost::memory_order_seq_cst, boost::memory_order_seq_cst );
+        BOOST_TEST( r );
+        BOOST_TEST_SP_EQ( apx.load(), px2 );
+    }
+
+    // compare_exchange_strong, rv
+
+    {
+        boost::shared_ptr<X> px( new X );
+        boost::atomic_shared_ptr<X> apx( px );
+
+        boost::shared_ptr<X> cmp;
+
+        bool r = apx.compare_exchange_strong( cmp, boost::shared_ptr<X>() );
+
+        BOOST_TEST( !r );
+        BOOST_TEST_SP_EQ( apx.load(), px );
+        BOOST_TEST_SP_EQ( cmp, px );
+
+        r = apx.compare_exchange_strong( cmp, boost::shared_ptr<X>() );
+
+        BOOST_TEST( r );
+        BOOST_TEST( apx.load().get() == 0 );
+        BOOST_TEST( apx.load().use_count() == 0 );
+    }
+
+    // compare_exchange_strong, rv, w/ mo
+
+    {
+        boost::shared_ptr<X> px( new X );
+        boost::atomic_shared_ptr<X> apx( px );
+
+        boost::shared_ptr<X> cmp;
+
+        bool r = apx.compare_exchange_strong( cmp, boost::shared_ptr<X>(), boost::memory_order_seq_cst, boost::memory_order_seq_cst );
+
+        BOOST_TEST( !r );
+        BOOST_TEST_SP_EQ( apx.load(), px );
+        BOOST_TEST_SP_EQ( cmp, px );
+
+        r = apx.compare_exchange_strong( cmp, boost::shared_ptr<X>(), boost::memory_order_seq_cst, boost::memory_order_seq_cst );
+
+        BOOST_TEST( r );
+        BOOST_TEST( apx.load().get() == 0 );
+        BOOST_TEST( apx.load().use_count() == 0 );
+    }
+
+    return boost::report_errors();
+}