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+//
+// detail/static_mutex.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 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 ASIO_DETAIL_STATIC_MUTEX_HPP
+#define ASIO_DETAIL_STATIC_MUTEX_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if !defined(ASIO_HAS_THREADS)
+# include "asio/detail/null_static_mutex.hpp"
+#elif defined(ASIO_WINDOWS)
+# include "asio/detail/win_static_mutex.hpp"
+#elif defined(ASIO_HAS_PTHREADS)
+# include "asio/detail/posix_static_mutex.hpp"
+#elif defined(ASIO_HAS_STD_MUTEX_AND_CONDVAR)
+# include "asio/detail/std_static_mutex.hpp"
+#else
+# error Only Windows and POSIX are supported!
+#endif
+
+namespace asio {
+namespace detail {
+
+#if !defined(ASIO_HAS_THREADS)
+typedef null_static_mutex static_mutex;
+# define ASIO_STATIC_MUTEX_INIT ASIO_NULL_STATIC_MUTEX_INIT
+#elif defined(ASIO_WINDOWS)
+typedef win_static_mutex static_mutex;
+# define ASIO_STATIC_MUTEX_INIT ASIO_WIN_STATIC_MUTEX_INIT
+#elif defined(ASIO_HAS_PTHREADS)
+typedef posix_static_mutex static_mutex;
+# define ASIO_STATIC_MUTEX_INIT ASIO_POSIX_STATIC_MUTEX_INIT
+#elif defined(ASIO_HAS_STD_MUTEX_AND_CONDVAR)
+typedef std_static_mutex static_mutex;
+# define ASIO_STATIC_MUTEX_INIT ASIO_STD_STATIC_MUTEX_INIT
+#endif
+
+} // namespace detail
+} // namespace asio
+
+#endif // ASIO_DETAIL_STATIC_MUTEX_HPP