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                                 : "memory");
      }

      #define BOOST_CONTAINER_CAS_LOCK(sl)     boost_container_x86_cas_lock(sl)
      #define BOOST_CONTAINER_CLEAR_LOCK(sl)   boost_container_x86_clear_lock(sl)

   #else /* Win32 MSC */
      #define BOOST_CONTAINER_CAS_LOCK(sl)     interlockedexchange((long volatile*)sl, (long)1)
      #define BOOST_CONTAINER_CLEAR_LOCK(sl)   interlockedexchange((long volatile*)sl, (long)0)
   #endif

   /* How to yield for a spin lock */
   #define SPINS_PER_YIELD       63
   #if defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
      #define SLEEP_EX_DURATION     50 /* delay for yield/sleep */
      #define SPIN_LOCK_YIELD  SleepEx(SLEEP_EX_DURATION, FALSE)
   #elif defined (__SVR4) && defined (__sun) /* solaris */
      #include <thread.h>
      #define SPIN_LOCK_YIELD   thr_yield();
   #elif !defined(LACKS_SCHED_H)
      #include <sched.h>
      #define SPIN_LOCK_YIELD   sched_yield();
   #else
      #define SPIN_LOCK_YIELD
   #endif /* ... yield ... */

   #define BOOST_CONTAINER_SPINS_PER_YIELD       63
   inline int boost_interprocess_spin_acquire_lock(int *sl) {
      int spins = 0;
      while (*(volatile int *)sl != 0 ||
         BOOST_CONTAINER_CAS_LOCK(sl)) {
         if ((++spins & BOOST_CONTAINER_SPINS_PER_YIELD) == 0) {
            SPIN_LOCK_YIELD;
         }
      }
      return 0;
   }
   #define BOOST_CONTAINER_MLOCK_T               int
   #define BOOST_CONTAINER_TRY_LOCK(sl)          !BOOST_CONTAINER_CAS_LOCK(sl)
   #define BOOST_CONTAINER_RELEASE_LOCK(sl)      BOOST_CONTAINER_CLEAR_LOCK(sl)
   #define BOOST_CONTAINER_ACQUIRE_LOCK(sl)      (BOOST_CONTAINER_CAS_LOCK(sl)? boost_interprocess_spin_acquire_lock(sl) : 0)
   #define BOOST_MOVE_INITIAL_LOCK(sl)      (*sl = 0)
   #define BOOST_CONTAINER_DESTROY_LOCK(sl)      (0)
#elif BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_WIN32
   //
#elif BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_PTHREAD
   #include <pthread.h>
#endif

namespace boost {
namespace container {
namespace dtl {

#if BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_NONE
   class null_mutex
   {
   private:
      null_mutex(const null_mutex &);
      void operator=(const null_mutex &);

   public:
      null_mutex() { }

      static void lock() { }
      static void unlock() { }
   };

  typedef null_mutex default_mutex;
#elif BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_SPINLOCKS

   class spin_mutex
   {
   private:
      BOOST_CONTAINER_MLOCK_T sl;
      spin_mutex(const spin_mutex &);
      void operator=(const spin_mutex &);

   public:
      spin_mutex() { BOOST_MOVE_INITIAL_LOCK(&sl); }

      void lock() { BOOST_CONTAINER_ACQUIRE_LOCK(&sl); }
      void unlock() { BOOST_CONTAINER_RELEASE_LOCK(&sl); }
   };
  typedef spin_mutex default_mutex;
#elif BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_WIN32
   class mutex
   {
   private:
      CRITICAL_SECTION mtx;

      mutex(const mutex &);
      void operator=(const mutex &);

   public:
      mutex()
      { InitializeCriticalSection(&mtx); }

      ~mutex()
      { DeleteCriticalSection(&mtx); }

      void lock()
      { EnterCriticalSection(&mtx); }

      void unlock()
      { LeaveCriticalSection(&mtx); }
   };

  typedef mutex default_mutex;
#elif BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_PTHREAD
   class mutex
   {
   private:
      pthread_mutex_t mtx;

      mutex(const mutex &);
      void operator=(const mutex &);

   public:
      mutex()
      { pthread_mutex_init(&mtx, 0); }

      ~mutex()
      { pthread_mutex_destroy(&mtx); }

      void lock()
      { pthread_mutex_lock(&mtx); }

      void unlock()
      { pthread_mutex_unlock(&mtx); }
   };

  typedef mutex default_mutex;
#endif

template<class Mutex>
class scoped_lock
{
   public:
   scoped_lock(Mutex &m)
      :  m_(m)
   { m_.lock(); }
   ~scoped_lock()
   { m_.unlock(); }

   private:
   Mutex &m_;
};

} // namespace dtl
} // namespace container
} // namespace boost

#undef BOOST_MUTEX_HELPER_WIN32
#undef BOOST_MUTEX_HELPER_PTHREAD
#undef BOOST_MUTEX_HELPER_NONE
#undef BOOST_MUTEX_HELPER
#undef BOOST_MUTEX_HELPER_SPINLOCKS

#include <boost/container/detail/config_end.hpp>

#endif