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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Stephen Cleary 2000 
// (C) Copyright Ion Gaztanaga  2015-2017.
//
// 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)
//
// See http://www.boost.org/libs/container for documentation.
//
//////////////////////////////////////////////////////////////////////////////

#ifndef BOOST_CONTAINER_MUTEX_HPP
#define BOOST_CONTAINER_MUTEX_HPP

#ifndef BOOST_CONFIG_HPP
#  include <boost/config.hpp>
#endif

#if defined(BOOST_HAS_PRAGMA_ONCE)
#  pragma once
#endif

//#define BOOST_CONTAINER_NO_MT
//#define BOOST_CONTAINER_NO_SPINLOCKS

#include <boost/container/detail/config_begin.hpp>
#include <boost/container/detail/workaround.hpp>

// Extremely Light-Weight wrapper classes for OS thread synchronization

#define BOOST_MUTEX_HELPER_NONE         0
#define BOOST_MUTEX_HELPER_WIN32        1
#define BOOST_MUTEX_HELPER_PTHREAD      2
#define BOOST_MUTEX_HELPER_SPINLOCKS    3

#if !defined(BOOST_HAS_THREADS) && !defined(BOOST_NO_MT)
# define BOOST_NO_MT
#endif

#if defined(BOOST_NO_MT) || defined(BOOST_CONTAINER_NO_MT)
  // No multithreading -> make locks into no-ops
  #define BOOST_MUTEX_HELPER BOOST_MUTEX_HELPER_NONE
#else
   //Taken from dlmalloc
   #if !defined(BOOST_CONTAINER_NO_SPINLOCKS) &&                           \
         ((defined(__GNUC__) &&                                            \
         ((__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)) ||      \
         defined(__i386__) || defined(__x86_64__))) ||                     \
      (defined(_MSC_VER) && _MSC_VER>=1310))
      #define BOOST_MUTEX_HELPER BOOST_MUTEX_HELPER_SPINLOCKS
   #endif

   #if defined(BOOST_WINDOWS)
      #include <windows.h>
      #ifndef BOOST_MUTEX_HELPER
         #define BOOST_MUTEX_HELPER BOOST_MUTEX_HELPER_WIN32
      #endif
   #elif defined(BOOST_HAS_UNISTD_H)
      #include <unistd.h>
      #if !defined(BOOST_MUTEX_HELPER) && (defined(_POSIX_THREADS) || defined(BOOST_HAS_PTHREADS))
         #define BOOST_MUTEX_HELPER BOOST_MUTEX_HELPER_PTHREAD
      #endif
   #endif
#endif

#ifndef BOOST_MUTEX_HELPER
  #error Unable to determine platform mutex type; #define BOOST_NO_MT to assume single-threaded
#endif

#if BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_NONE
   //...
#elif BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_SPINLOCKS
   #if defined(_MSC_VER)
      #ifndef _M_AMD64
         /* These are already defined on AMD64 builds */
         #ifdef __cplusplus
            extern "C" {
         #endif /* __cplusplus */
            long __cdecl _InterlockedCompareExchange(long volatile *Dest, long Exchange, long Comp);
            long __cdecl _InterlockedExchange(long volatile *Target, long Value);
         #ifdef __cplusplus
            }
         #endif /* __cplusplus */
      #endif /* _M_AMD64 */
      #pragma intrinsic (_InterlockedCompareExchange)
      #pragma intrinsic (_InterlockedExchange)
      #define interlockedcompareexchange _InterlockedCompareExchange
      #define interlockedexchange        _InterlockedExchange
   #elif defined(WIN32) && defined(__GNUC__)