Add spinlock_gcc_atomic.hpp

include/boost/smart_ptr/detail/spinlock.hpp

@@ -28,21 +28,19 @@
 //  #define BOOST_DETAIL_SPINLOCK_INIT <unspecified>
 //
 
-#include <boost/config.hpp>
+#include <boost/smart_ptr/detail/sp_has_gcc_intrinsics.hpp>
 #include <boost/smart_ptr/detail/sp_has_sync_intrinsics.hpp>
+#include <boost/config.hpp>
 
 #if defined( BOOST_SP_USE_STD_ATOMIC )
-# if !defined( __clang__ )
-#   include <boost/smart_ptr/detail/spinlock_std_atomic.hpp>
-# else
-//  Clang (at least up to 3.4) can't compile spinlock_pool when
-//  using std::atomic, so substitute the __sync implementation instead.
-#   include <boost/smart_ptr/detail/spinlock_sync.hpp>
-# endif
+#  include <boost/smart_ptr/detail/spinlock_std_atomic.hpp>
 
 #elif defined( BOOST_SP_USE_PTHREADS )
 #  include <boost/smart_ptr/detail/spinlock_pt.hpp>
 
+#elif defined( BOOST_SP_HAS_GCC_INTRINSICS )
+#  include <boost/smart_ptr/detail/spinlock_gcc_atomic.hpp>
+
 #elif !defined( BOOST_NO_CXX11_HDR_ATOMIC )
 #  include <boost/smart_ptr/detail/spinlock_std_atomic.hpp>
 

include/boost/smart_ptr/detail/spinlock_gcc_atomic.hpp

@@ -0,0 +1,90 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ATOMIC_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ATOMIC_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  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 <boost/smart_ptr/detail/yield_k.hpp>
+
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using __atomic spinlock")
+
+#endif
+
+namespace boost
+{
+
+namespace detail
+{
+
+class spinlock
+{
+public:
+
+    unsigned char v_;
+
+public:
+
+    bool try_lock()
+    {
+        int r = __atomic_test_and_set( &v_, __ATOMIC_ACQUIRE );
+        return r == 0;
+    }
+
+    void lock()
+    {
+        for( unsigned k = 0; !try_lock(); ++k )
+        {
+            boost::detail::yield( k );
+        }
+    }
+
+    void unlock()
+    {
+        __atomic_clear( &v_, __ATOMIC_RELEASE );
+    }
+
+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 boost
+
+#define BOOST_DETAIL_SPINLOCK_INIT {0}
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ATOMIC_HPP_INCLUDED