detail/spinlock_pool.hpp added.

[SVN r44074]

include/boost/detail/spinlock_pool.hpp

@@ -0,0 +1,85 @@
+#ifndef BOOST_DETAIL_SPINLOCK_POOL_HPP_INCLUDED
+#define BOOST_DETAIL_SPINLOCK_POOL_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  boost/detail/spinlock_pool.hpp
+//
+//  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)
+//
+//  spinlock_pool<0> is reserved for atomic<>, when/if it arrives
+//  spinlock_pool<1> is reserved for shared_ptr reference counts
+//  spinlock_pool<2> is reserved for shared_ptr atomic access
+//
+
+#include <boost/detail/spinlock.hpp>
+
+namespace boost
+{
+
+namespace detail
+{
+
+template< int I > class spinlock_pool
+{
+private:
+
+    static spinlock pool_[ 41 ];
+
+public:
+
+    static spinlock & spinlock_for( void * pv )
+    {
+        size_t i = reinterpret_cast< size_t >( pv ) % 41;
+        return pool_[ i ];
+    }
+
+    class scoped_lock
+    {
+    private:
+
+        spinlock & sp_;
+
+        scoped_lock( scoped_lock const & );
+        scoped_lock & operator=( scoped_lock const & );
+
+    public:
+
+        explicit scoped_lock( void * pv ): sp_( spinlock_for( pv ) )
+        {
+            sp_.lock();
+        }
+
+        ~scoped_lock()
+        {
+            sp_.unlock();
+        }
+    };
+};
+
+template< int I > spinlock spinlock_pool< I >::pool_[ 41 ] =
+{
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
+    BOOST_DETAIL_SPINLOCK_INIT
+};
+
+} // namespace detail
+} // namespace boost
+
+#endif // #ifndef BOOST_DETAIL_SPINLOCK_POOL_HPP_INCLUDED

test/Jamfile.v2

@@ -42,5 +42,6 @@ import testing ;
           [ run spinlock_test.cpp ]
           [ run spinlock_try_test.cpp ]
           [ run spinlock_try_test.cpp : : : <threading>multi : spinlock_try_test.mt ]
+          [ run spinlock_pool_test.cpp ]
         ;
 }

test/spinlock_pool_test.cpp

@@ -0,0 +1,30 @@
+//
+// spinlock_pool_test.cpp
+//
+// Copyright 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 <boost/detail/spinlock_pool.hpp>
+
+// Sanity check only
+
+int main()
+{
+    int x = 0;
+
+    {
+		boost::detail::spinlock_pool<0>::scoped_lock lock( &x );
+        ++x;
+    }
+
+    {
+        boost::detail::spinlock_pool<1>::scoped_lock lock( &x );
+        boost::detail::spinlock_pool<2>::scoped_lock lock2( &x );
+    }
+
+    return 0;
+}