summaryrefslogtreecommitdiff
path: root/boost/asio/detail/std_fenced_block.hpp
diff options
context:
space:
mode:
Diffstat (limited to 'boost/asio/detail/std_fenced_block.hpp')
-rw-r--r--boost/asio/detail/std_fenced_block.hpp64
1 files changed, 64 insertions, 0 deletions
diff --git a/boost/asio/detail/std_fenced_block.hpp b/boost/asio/detail/std_fenced_block.hpp
new file mode 100644
index 0000000000..b3bd9d5931
--- /dev/null
+++ b/boost/asio/detail/std_fenced_block.hpp
@@ -0,0 +1,64 @@
+//
+// detail/std_fenced_block.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// 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)
+//
+
+#ifndef BOOST_ASIO_DETAIL_STD_FENCED_BLOCK_HPP
+#define BOOST_ASIO_DETAIL_STD_FENCED_BLOCK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#if defined(BOOST_ASIO_HAS_STD_ATOMIC)
+
+#include <atomic>
+#include <boost/asio/detail/noncopyable.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+class std_fenced_block
+ : private noncopyable
+{
+public:
+ enum half_t { half };
+ enum full_t { full };
+
+ // Constructor for a half fenced block.
+ explicit std_fenced_block(half_t)
+ {
+ }
+
+ // Constructor for a full fenced block.
+ explicit std_fenced_block(full_t)
+ {
+ std::atomic_thread_fence(std::memory_order_acquire);
+ }
+
+ // Destructor.
+ ~std_fenced_block()
+ {
+ std::atomic_thread_fence(std::memory_order_release);
+ }
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // defined(BOOST_ASIO_HAS_STD_ATOMIC)
+
+#endif // BOOST_ASIO_DETAIL_STD_FENCED_BLOCK_HPP