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Kokkos_Atomic.hpp
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Kokkos_Atomic.hpp
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/*
//@HEADER
// ************************************************************************
//
// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
//
// ************************************************************************
//@HEADER
*/
/// \file Kokkos_Atomic.hpp
/// \brief Atomic functions
///
/// This header file defines prototypes for the following atomic functions:
/// - exchange
/// - compare and exchange
/// - add
///
/// Supported types include:
/// - signed and unsigned 4 and 8 byte integers
/// - float
/// - double
///
/// They are implemented through GCC compatible intrinsics, OpenMP
/// directives and native CUDA intrinsics.
///
/// Including this header file requires one of the following
/// compilers:
/// - NVCC (for CUDA device code only)
/// - GCC (for host code only)
/// - Intel (for host code only)
/// - A compiler that supports OpenMP 3.1 (for host code only)
#ifndef KOKKOS_ATOMIC_HPP
#define KOKKOS_ATOMIC_HPP
#include <Kokkos_Macros.hpp>
#include <Kokkos_HostSpace.hpp>
#include <impl/Kokkos_Traits.hpp>
//----------------------------------------------------------------------------
#if defined(_WIN32)
#define KOKKOS_ATOMICS_USE_WINDOWS
#else
#if defined( __CUDA_ARCH__ ) && defined( KOKKOS_HAVE_CUDA )
// Compiling NVIDIA device code, must use Cuda atomics:
#define KOKKOS_ATOMICS_USE_CUDA
#elif ! defined( KOKKOS_ATOMICS_USE_GCC ) && \
! defined( KOKKOS_ATOMICS_USE_INTEL ) && \
! defined( KOKKOS_ATOMICS_USE_OMP31 )
// Compiling for non-Cuda atomic implementation has not been pre-selected.
// Choose the best implementation for the detected compiler.
// Preference: GCC, INTEL, OMP31
#if defined( KOKKOS_COMPILER_GNU ) || \
defined( KOKKOS_COMPILER_CLANG ) || \
( defined ( KOKKOS_COMPILER_NVCC ) && defined ( __GNUC__ ) )
#define KOKKOS_ATOMICS_USE_GCC
#elif defined( KOKKOS_COMPILER_INTEL ) || \
defined( KOKKOS_COMPILER_CRAYC )
#define KOKKOS_ATOMICS_USE_INTEL
#elif defined( _OPENMP ) && ( 201107 <= _OPENMP )
#define KOKKOS_ATOMICS_USE_OMP31
#else
#error "KOKKOS_ATOMICS_USE : Unsupported compiler"
#endif
#endif /* Not pre-selected atomic implementation */
#endif
//----------------------------------------------------------------------------
// Forward decalaration of functions supporting arbitrary sized atomics
// This is necessary since Kokkos_Atomic.hpp is internally included very early
// through Kokkos_HostSpace.hpp as well as the allocation tracker.
#ifdef KOKKOS_HAVE_CUDA
namespace Kokkos {
namespace Impl {
/// \brief Aquire a lock for the address
///
/// This function tries to aquire the lock for the hash value derived
/// from the provided ptr. If the lock is successfully aquired the
/// function returns true. Otherwise it returns false.
__device__ inline
bool lock_address_cuda_space(void* ptr);
/// \brief Release lock for the address
///
/// This function releases the lock for the hash value derived
/// from the provided ptr. This function should only be called
/// after previously successfully aquiring a lock with
/// lock_address.
__device__ inline
void unlock_address_cuda_space(void* ptr);
}
}
#endif
namespace Kokkos {
template <typename T>
KOKKOS_INLINE_FUNCTION
void atomic_add(volatile T * const dest, const T src);
// Atomic increment
template<typename T>
KOKKOS_INLINE_FUNCTION
void atomic_increment(volatile T* a);
template<typename T>
KOKKOS_INLINE_FUNCTION
void atomic_decrement(volatile T* a);
}
namespace Kokkos {
inline
const char * atomic_query_version()
{
#if defined( KOKKOS_ATOMICS_USE_CUDA )
return "KOKKOS_ATOMICS_USE_CUDA" ;
#elif defined( KOKKOS_ATOMICS_USE_GCC )
return "KOKKOS_ATOMICS_USE_GCC" ;
#elif defined( KOKKOS_ATOMICS_USE_INTEL )
return "KOKKOS_ATOMICS_USE_INTEL" ;
#elif defined( KOKKOS_ATOMICS_USE_OMP31 )
return "KOKKOS_ATOMICS_USE_OMP31" ;
#elif defined( KOKKOS_ATOMICS_USE_WINDOWS )
return "KOKKOS_ATOMICS_USE_WINDOWS";
#endif
}
} // namespace Kokkos
#ifdef _WIN32
#include "impl/Kokkos_Atomic_Windows.hpp"
#else
//----------------------------------------------------------------------------
// Atomic Assembly
//
// Implements CAS128-bit in assembly
#include "impl/Kokkos_Atomic_Assembly.hpp"
//----------------------------------------------------------------------------
// Atomic exchange
//
// template< typename T >
// T atomic_exchange( volatile T* const dest , const T val )
// { T tmp = *dest ; *dest = val ; return tmp ; }
#include "impl/Kokkos_Atomic_Exchange.hpp"
//----------------------------------------------------------------------------
// Atomic compare-and-exchange
//
// template<class T>
// bool atomic_compare_exchange_strong(volatile T* const dest, const T compare, const T val)
// { bool equal = compare == *dest ; if ( equal ) { *dest = val ; } return equal ; }
#include "impl/Kokkos_Atomic_Compare_Exchange_Strong.hpp"
//----------------------------------------------------------------------------
// Atomic fetch and add
//
// template<class T>
// T atomic_fetch_add(volatile T* const dest, const T val)
// { T tmp = *dest ; *dest += val ; return tmp ; }
#include "impl/Kokkos_Atomic_Fetch_Add.hpp"
//----------------------------------------------------------------------------
// Atomic increment
//
// template<class T>
// T atomic_increment(volatile T* const dest)
// { dest++; }
#include "impl/Kokkos_Atomic_Increment.hpp"
//----------------------------------------------------------------------------
// Atomic Decrement
//
// template<class T>
// T atomic_decrement(volatile T* const dest)
// { dest--; }
#include "impl/Kokkos_Atomic_Decrement.hpp"
//----------------------------------------------------------------------------
// Atomic fetch and sub
//
// template<class T>
// T atomic_fetch_sub(volatile T* const dest, const T val)
// { T tmp = *dest ; *dest -= val ; return tmp ; }
#include "impl/Kokkos_Atomic_Fetch_Sub.hpp"
//----------------------------------------------------------------------------
// Atomic fetch and or
//
// template<class T>
// T atomic_fetch_or(volatile T* const dest, const T val)
// { T tmp = *dest ; *dest = tmp | val ; return tmp ; }
#include "impl/Kokkos_Atomic_Fetch_Or.hpp"
//----------------------------------------------------------------------------
// Atomic fetch and and
//
// template<class T>
// T atomic_fetch_and(volatile T* const dest, const T val)
// { T tmp = *dest ; *dest = tmp & val ; return tmp ; }
#include "impl/Kokkos_Atomic_Fetch_And.hpp"
#endif /*Not _WIN32*/
//----------------------------------------------------------------------------
// Memory fence
//
// All loads and stores from this thread will be globally consistent before continuing
//
// void memory_fence() {...};
#include "impl/Kokkos_Memory_Fence.hpp"
//----------------------------------------------------------------------------
// Provide volatile_load and safe_load
//
// T volatile_load(T const volatile * const ptr);
//
// T const& safe_load(T const * const ptr);
// XEON PHI
// T safe_load(T const * const ptr
#include "impl/Kokkos_Volatile_Load.hpp"
#ifndef _WIN32
#include "impl/Kokkos_Atomic_Generic.hpp"
#endif
//----------------------------------------------------------------------------
// This atomic-style macro should be an inlined function, not a macro
#if defined( KOKKOS_COMPILER_GNU ) && !defined(__PGIC__)
#define KOKKOS_NONTEMPORAL_PREFETCH_LOAD(addr) __builtin_prefetch(addr,0,0)
#define KOKKOS_NONTEMPORAL_PREFETCH_STORE(addr) __builtin_prefetch(addr,1,0)
#else
#define KOKKOS_NONTEMPORAL_PREFETCH_LOAD(addr) ((void)0)
#define KOKKOS_NONTEMPORAL_PREFETCH_STORE(addr) ((void)0)
#endif
//----------------------------------------------------------------------------
#endif /* KOKKOS_ATOMIC_HPP */
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