C++ (Cpp) KOKKOS_IMPL_CUDA_BALLOT Exemples

Exemple #1

Fichier : Kokkos_Atomic_Exchange.hpp Projet : Pakketeretet2/lammps

__inline__ __device__
T atomic_exchange( volatile T * const dest ,
    typename Kokkos::Impl::enable_if<
                  ( sizeof(T) != 4 )
               && ( sizeof(T) != 8 )
             , const T >::type& val )
{
  T return_val;
  // This is a way to (hopefully) avoid dead lock in a warp
#if defined( KOKKOS_ENABLE_RFO_PREFETCH )
  _mm_prefetch( (const char*) dest, _MM_HINT_ET0 );
#endif

  int done = 0;
  unsigned int active = KOKKOS_IMPL_CUDA_BALLOT(1);
  unsigned int done_active = 0;
  while (active!=done_active) {
    if(!done) {
      if( Impl::lock_address_cuda_space( (void*) dest ) ) {
        return_val = *dest;
        *dest = val;
        Impl::unlock_address_cuda_space( (void*) dest );
        done = 1;
      }
    }
    done_active = KOKKOS_IMPL_CUDA_BALLOT(done);
  }
  return return_val;
}

Exemple #2

Fichier : Kokkos_Atomic_Compare_Exchange_Strong.hpp Projet : Pakketeretet2/lammps

__inline__ __device__
T atomic_compare_exchange( volatile T * const dest , const T & compare ,
    typename Kokkos::Impl::enable_if<
                  ( sizeof(T) != 4 )
               && ( sizeof(T) != 8 )
             , const T >::type& val )
{
  T return_val;
  // This is a way to (hopefully) avoid dead lock in a warp
  int done = 0;
  unsigned int active = KOKKOS_IMPL_CUDA_BALLOT(1);
  unsigned int done_active = 0;
  while (active!=done_active) {
    if(!done) {
      if( Impl::lock_address_cuda_space( (void*) dest ) ) {
        return_val = *dest;
        if( return_val == compare )
          *dest = val;
        Impl::unlock_address_cuda_space( (void*) dest );
        done = 1;
      }
    }
    done_active = KOKKOS_IMPL_CUDA_BALLOT(done);
  }
  return return_val;
}

Exemple #3

Fichier : Kokkos_Atomic_Generic.hpp Projet : hcedwar/kokkos

KOKKOS_INLINE_FUNCTION
T atomic_oper_fetch( const Oper& op, volatile T * const dest ,
  typename Kokkos::Impl::enable_if<
                ( sizeof(T) != 4 )
             && ( sizeof(T) != 8 )
          #if defined(KOKKOS_ENABLE_ASM) && defined(KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_HOST)
             && ( sizeof(T) != 16 )
          #endif
           , const T >::type& val )
{

#ifdef KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_HOST
  while( !Impl::lock_address_host_space( (void*) dest ) );
  T return_val = Oper::apply(*dest, val);
  *dest = return_val;
  Impl::unlock_address_host_space( (void*) dest );
  return return_val;
#elif defined(KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_CUDA)
  T return_val;
  // This is a way to (hopefully) avoid dead lock in a warp
  int done = 0;
  unsigned int active = KOKKOS_IMPL_CUDA_BALLOT(1);
  unsigned int done_active = 0;
  while (active!=done_active) {
    if(!done) {
      if( Impl::lock_address_cuda_space( (void*) dest ) ) {
        return_val = Oper::apply(*dest, val);
        *dest = return_val;
        Impl::unlock_address_cuda_space( (void*) dest );
        done=1;
      }
    }
    done_active = KOKKOS_IMPL_CUDA_BALLOT(done);
  }
  return return_val;
#endif
}