Squashed 'third_party/boostorg/smart_ptr/' content from commit e37cd41
Change-Id: Ib1d9c588d60cbb7a3bad5a6f8b7e4761af21be72
git-subtree-dir: third_party/boostorg/smart_ptr
git-subtree-split: e37cd4154f492b3cd2ea8e87806614ffddf1163a
diff --git a/include/boost/smart_ptr/detail/spinlock.hpp b/include/boost/smart_ptr/detail/spinlock.hpp
new file mode 100644
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+++ b/include/boost/smart_ptr/detail/spinlock.hpp
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+#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SPINLOCK_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+// boost/detail/spinlock.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)
+//
+// struct spinlock
+// {
+// void lock();
+// bool try_lock();
+// void unlock();
+//
+// class scoped_lock;
+// };
+//
+// #define BOOST_DETAIL_SPINLOCK_INIT <unspecified>
+//
+
+#include <boost/config.hpp>
+#include <boost/smart_ptr/detail/sp_has_sync.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
+
+#elif defined( BOOST_SP_USE_PTHREADS )
+# include <boost/smart_ptr/detail/spinlock_pt.hpp>
+
+#elif !defined( BOOST_NO_CXX11_HDR_ATOMIC )
+# include <boost/smart_ptr/detail/spinlock_std_atomic.hpp>
+
+#elif defined(__GNUC__) && defined( __arm__ ) && !defined( __thumb__ )
+# include <boost/smart_ptr/detail/spinlock_gcc_arm.hpp>
+
+#elif defined( BOOST_SP_HAS_SYNC )
+# include <boost/smart_ptr/detail/spinlock_sync.hpp>
+
+#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
+# include <boost/smart_ptr/detail/spinlock_w32.hpp>
+
+#elif defined(BOOST_HAS_PTHREADS)
+# include <boost/smart_ptr/detail/spinlock_pt.hpp>
+
+#elif !defined(BOOST_HAS_THREADS)
+# include <boost/smart_ptr/detail/spinlock_nt.hpp>
+
+#else
+# error Unrecognized threading platform
+#endif
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_HPP_INCLUDED