1 files changed, 70 insertions, 0 deletions
diff --git a/boost/atomic/detail/atomic_flag.hpp b/boost/atomic/detail/atomic_flag.hpp
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+++ b/boost/atomic/detail/atomic_flag.hpp
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+/*
+ * 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)
+ *
+ * Copyright (c) 2014 Andrey Semashev
+ */
+/*!
+ * \file   atomic/detail/atomic_flag.hpp
+ *
+ * This header contains interface definition of \c atomic_flag.
+ */
+
+#ifndef BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_
+#define BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_
+
+#include <boost/assert.hpp>
+#include <boost/memory_order.hpp>
+#include <boost/atomic/detail/config.hpp>
+#include <boost/atomic/detail/operations_lockfree.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+/*
+ * IMPLEMENTATION NOTE: All interface functions MUST be declared with BOOST_FORCEINLINE,
+ *                      see comment for convert_memory_order_to_gcc in ops_gcc_atomic.hpp.
+ */
+
+namespace boost {
+namespace atomics {
+
+#if defined(BOOST_NO_CXX11_CONSTEXPR) || defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX)
+#define BOOST_ATOMIC_NO_ATOMIC_FLAG_INIT
+#else
+#define BOOST_ATOMIC_FLAG_INIT {}
+#endif
+
+struct atomic_flag
+{
+    typedef atomics::detail::operations< 1u, false > operations;
+    typedef operations::storage_type storage_type;
+
+    storage_type m_storage;
+
+    BOOST_FORCEINLINE BOOST_CONSTEXPR atomic_flag() BOOST_NOEXCEPT : m_storage(0)
+    {
+    }
+
+    BOOST_FORCEINLINE bool test_and_set(memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
+    {
+        return operations::test_and_set(m_storage, order);
+    }
+
+    BOOST_FORCEINLINE void clear(memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
+    {
+        BOOST_ASSERT(order != memory_order_acquire);
+        BOOST_ASSERT(order != memory_order_acq_rel);
+        operations::clear(m_storage, order);
+    }
+
+    BOOST_DELETED_FUNCTION(atomic_flag(atomic_flag const&))
+    BOOST_DELETED_FUNCTION(atomic_flag& operator= (atomic_flag const&))
+};
+
+} // namespace atomics
+} // namespace boost
+
+#endif // BOOST_ATOMIC_DETAIL_ATOMIC_FLAG_HPP_INCLUDED_