Added boost header

test/external/boost/asio/detail/scoped_lock.hpp

@@ -0,0 +1,93 @@
+//
+// detail/scoped_lock.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2011 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_SCOPED_LOCK_HPP
+#define BOOST_ASIO_DETAIL_SCOPED_LOCK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/noncopyable.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+// Helper class to lock and unlock a mutex automatically.
+template <typename Mutex>
+class scoped_lock
+  : private noncopyable
+{
+public:
+  // Constructor acquires the lock.
+  scoped_lock(Mutex& m)
+    : mutex_(m)
+  {
+    mutex_.lock();
+    locked_ = true;
+  }
+
+  // Destructor releases the lock.
+  ~scoped_lock()
+  {
+    if (locked_)
+      mutex_.unlock();
+  }
+
+  // Explicitly acquire the lock.
+  void lock()
+  {
+    if (!locked_)
+    {
+      mutex_.lock();
+      locked_ = true;
+    }
+  }
+
+  // Explicitly release the lock.
+  void unlock()
+  {
+    if (locked_)
+    {
+      mutex_.unlock();
+      locked_ = false;
+    }
+  }
+
+  // Test whether the lock is held.
+  bool locked() const
+  {
+    return locked_;
+  }
+
+  // Get the underlying mutex.
+  Mutex& mutex()
+  {
+    return mutex_;
+  }
+
+private:
+  // The underlying mutex.
+  Mutex& mutex_;
+
+  // Whether the mutex is currently locked or unlocked.
+  bool locked_;
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_SCOPED_LOCK_HPP