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lib/kokkos/core/src/Kokkos_Atomic.hpp
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285
lib/kokkos/core/src/Kokkos_Atomic.hpp
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/*
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//@HEADER
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// ************************************************************************
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//
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// Kokkos v. 2.0
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// Copyright (2014) Sandia Corporation
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// 1. Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// 3. Neither the name of the Corporation nor the names of the
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
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//
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// ************************************************************************
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//@HEADER
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*/
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/// \file Kokkos_Atomic.hpp
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/// \brief Atomic functions
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///
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/// This header file defines prototypes for the following atomic functions:
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/// - exchange
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/// - compare and exchange
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/// - add
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///
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/// Supported types include:
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/// - signed and unsigned 4 and 8 byte integers
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/// - float
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/// - double
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///
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/// They are implemented through GCC compatible intrinsics, OpenMP
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/// directives and native CUDA intrinsics.
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///
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/// Including this header file requires one of the following
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/// compilers:
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/// - NVCC (for CUDA device code only)
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/// - GCC (for host code only)
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/// - Intel (for host code only)
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/// - A compiler that supports OpenMP 3.1 (for host code only)
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#ifndef KOKKOS_ATOMIC_HPP
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#define KOKKOS_ATOMIC_HPP
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#include <Kokkos_Macros.hpp>
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#include <Kokkos_HostSpace.hpp>
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#include <impl/Kokkos_Traits.hpp>
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//----------------------------------------------------------------------------
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#if defined(_WIN32)
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#define KOKKOS_ATOMICS_USE_WINDOWS
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#else
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#if defined( __CUDA_ARCH__ ) && defined( KOKKOS_HAVE_CUDA )
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// Compiling NVIDIA device code, must use Cuda atomics:
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#define KOKKOS_ATOMICS_USE_CUDA
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#elif ! defined( KOKKOS_ATOMICS_USE_GCC ) && \
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! defined( KOKKOS_ATOMICS_USE_INTEL ) && \
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! defined( KOKKOS_ATOMICS_USE_OMP31 )
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// Compiling for non-Cuda atomic implementation has not been pre-selected.
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// Choose the best implementation for the detected compiler.
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// Preference: GCC, INTEL, OMP31
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#if defined( KOKKOS_COMPILER_GNU ) || \
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defined( KOKKOS_COMPILER_CLANG ) || \
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( defined ( KOKKOS_COMPILER_NVCC ) && defined ( __GNUC__ ) )
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#define KOKKOS_ATOMICS_USE_GCC
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#elif defined( KOKKOS_COMPILER_INTEL ) || \
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defined( KOKKOS_COMPILER_CRAYC )
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#define KOKKOS_ATOMICS_USE_INTEL
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#elif defined( _OPENMP ) && ( 201107 <= _OPENMP )
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#define KOKKOS_ATOMICS_USE_OMP31
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#else
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#error "KOKKOS_ATOMICS_USE : Unsupported compiler"
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#endif
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#endif /* Not pre-selected atomic implementation */
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#endif
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//----------------------------------------------------------------------------
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// Forward decalaration of functions supporting arbitrary sized atomics
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// This is necessary since Kokkos_Atomic.hpp is internally included very early
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// through Kokkos_HostSpace.hpp as well as the allocation tracker.
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#ifdef KOKKOS_HAVE_CUDA
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namespace Kokkos {
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namespace Impl {
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/// \brief Aquire a lock for the address
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///
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/// This function tries to aquire the lock for the hash value derived
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/// from the provided ptr. If the lock is successfully aquired the
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/// function returns true. Otherwise it returns false.
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__device__ inline
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bool lock_address_cuda_space(void* ptr);
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/// \brief Release lock for the address
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///
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/// This function releases the lock for the hash value derived
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/// from the provided ptr. This function should only be called
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/// after previously successfully aquiring a lock with
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/// lock_address.
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__device__ inline
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void unlock_address_cuda_space(void* ptr);
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}
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}
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#endif
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namespace Kokkos {
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template <typename T>
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KOKKOS_INLINE_FUNCTION
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void atomic_add(volatile T * const dest, const T src);
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// Atomic increment
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template<typename T>
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KOKKOS_INLINE_FUNCTION
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void atomic_increment(volatile T* a);
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template<typename T>
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KOKKOS_INLINE_FUNCTION
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void atomic_decrement(volatile T* a);
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}
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#if ! defined(_WIN32)
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#include<impl/Kokkos_Atomic_Assembly_X86.hpp>
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#endif
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namespace Kokkos {
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inline
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const char * atomic_query_version()
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{
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#if defined( KOKKOS_ATOMICS_USE_CUDA )
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return "KOKKOS_ATOMICS_USE_CUDA" ;
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#elif defined( KOKKOS_ATOMICS_USE_GCC )
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return "KOKKOS_ATOMICS_USE_GCC" ;
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#elif defined( KOKKOS_ATOMICS_USE_INTEL )
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return "KOKKOS_ATOMICS_USE_INTEL" ;
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#elif defined( KOKKOS_ATOMICS_USE_OMP31 )
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return "KOKKOS_ATOMICS_USE_OMP31" ;
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#elif defined( KOKKOS_ATOMICS_USE_WINDOWS )
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return "KOKKOS_ATOMICS_USE_WINDOWS";
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#endif
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}
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} // namespace Kokkos
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#ifdef _WIN32
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#include "impl/Kokkos_Atomic_Windows.hpp"
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#else
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//#include "impl/Kokkos_Atomic_Assembly_X86.hpp"
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//----------------------------------------------------------------------------
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// Atomic exchange
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//
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// template< typename T >
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// T atomic_exchange( volatile T* const dest , const T val )
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// { T tmp = *dest ; *dest = val ; return tmp ; }
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#include "impl/Kokkos_Atomic_Exchange.hpp"
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//----------------------------------------------------------------------------
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// Atomic compare-and-exchange
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//
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// template<class T>
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// bool atomic_compare_exchange_strong(volatile T* const dest, const T compare, const T val)
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// { bool equal = compare == *dest ; if ( equal ) { *dest = val ; } return equal ; }
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#include "impl/Kokkos_Atomic_Compare_Exchange_Strong.hpp"
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//----------------------------------------------------------------------------
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// Atomic fetch and add
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//
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// template<class T>
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// T atomic_fetch_add(volatile T* const dest, const T val)
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// { T tmp = *dest ; *dest += val ; return tmp ; }
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#include "impl/Kokkos_Atomic_Fetch_Add.hpp"
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//----------------------------------------------------------------------------
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// Atomic fetch and sub
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//
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// template<class T>
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// T atomic_fetch_sub(volatile T* const dest, const T val)
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// { T tmp = *dest ; *dest -= val ; return tmp ; }
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#include "impl/Kokkos_Atomic_Fetch_Sub.hpp"
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//----------------------------------------------------------------------------
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// Atomic fetch and or
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//
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// template<class T>
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// T atomic_fetch_or(volatile T* const dest, const T val)
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// { T tmp = *dest ; *dest = tmp | val ; return tmp ; }
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#include "impl/Kokkos_Atomic_Fetch_Or.hpp"
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//----------------------------------------------------------------------------
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// Atomic fetch and and
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//
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// template<class T>
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// T atomic_fetch_and(volatile T* const dest, const T val)
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// { T tmp = *dest ; *dest = tmp & val ; return tmp ; }
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#include "impl/Kokkos_Atomic_Fetch_And.hpp"
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#endif /*Not _WIN32*/
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//----------------------------------------------------------------------------
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// Memory fence
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//
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// All loads and stores from this thread will be globally consistent before continuing
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//
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// void memory_fence() {...};
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#include "impl/Kokkos_Memory_Fence.hpp"
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//----------------------------------------------------------------------------
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// Provide volatile_load and safe_load
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//
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// T volatile_load(T const volatile * const ptr);
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//
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// T const& safe_load(T const * const ptr);
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// XEON PHI
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// T safe_load(T const * const ptr
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#include "impl/Kokkos_Volatile_Load.hpp"
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#ifndef _WIN32
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#include "impl/Kokkos_Atomic_Generic.hpp"
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#endif
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//----------------------------------------------------------------------------
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// This atomic-style macro should be an inlined function, not a macro
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#if defined( KOKKOS_COMPILER_GNU ) && !defined(__PGIC__)
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#define KOKKOS_NONTEMPORAL_PREFETCH_LOAD(addr) __builtin_prefetch(addr,0,0)
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#define KOKKOS_NONTEMPORAL_PREFETCH_STORE(addr) __builtin_prefetch(addr,1,0)
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#else
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#define KOKKOS_NONTEMPORAL_PREFETCH_LOAD(addr) ((void)0)
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#define KOKKOS_NONTEMPORAL_PREFETCH_STORE(addr) ((void)0)
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#endif
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//----------------------------------------------------------------------------
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#endif /* KOKKOS_ATOMIC_HPP */
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