text: ///////////////////////////////////////////////////////////////////////////////
  /// DISCLAIMER
  ///
  /// Copyright 2014-2017 ArangoDB GmbH, Cologne, Germany
  /// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
  ///
  /// Licensed under the Apache License, Version 2.0 (the "License");
  /// you may not use this file except in compliance with the License.
  /// You may obtain a copy of the License at
  ///
  ///     http://www.apache.org/licenses/LICENSE-2.0
  ///
  /// Unless required by applicable law or agreed to in writing, software
  /// distributed under the License is distributed on an "AS IS" BASIS,
  /// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  /// See the License for the specific language governing permissions and
  /// limitations under the License.
  ///
  /// Copyright holder is ArangoDB GmbH, Cologne, Germany
  ///
  /// @author Daniel H. Larkin
  ////////////////////////////////////////////////////////////////////////////////
  
  #ifndef ARANGO_CPU_RELAX_H
  #define ARANGO_CPU_RELAX_H 1
  
  #include "Basics/Common.h"
  #include "Basics/operating-system.h"
  
  #include <thread>
  
  namespace arangodb {
  namespace basics {
  
  ////////////////////////////////////////////////////////////////////////////////
  /// @brief Function to let CPU relax inside spinlock.
  ////////////////////////////////////////////////////////////////////////////////
  inline void cpu_relax() {
  // TODO use <boost/fiber/detail/cpu_relax.hpp> when available (>1.65.0?)
  #if defined(__i386) || defined(_M_IX86) || defined(__x86_64__) || defined(_M_X64)
  #if defined _WIN32
    YieldProcessor();
  #else
    asm volatile("pause" ::: "memory");
  #endif
  #else
    static constexpr std::chrono::microseconds us0{0};
    std::this_thread::sleep_for(us0);
  #endif
  }
  
  }  // namespace basics
  }  // namespace arangodb
  
  #endif
  