/*
//@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
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// 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
*/

#include <Kokkos_Macros.hpp>

#ifdef KOKKOS_ENABLE_CUDA

#include <Cuda/Kokkos_Cuda_Locks.hpp>
#include <Cuda/Kokkos_Cuda_Error.hpp>
#include <Kokkos_Cuda.hpp>

#ifdef KOKKOS_ENABLE_CUDA_RELOCATABLE_DEVICE_CODE
namespace Kokkos {
namespace Impl {
__device__ __constant__
CudaLockArrays g_device_cuda_lock_arrays = { nullptr, nullptr, 0 };
}
}
#endif

namespace Kokkos {

namespace {

__global__ void init_lock_array_kernel_atomic() {
  unsigned i = blockIdx.x*blockDim.x + threadIdx.x;
  if(i<CUDA_SPACE_ATOMIC_MASK+1) {
    Kokkos::Impl::g_device_cuda_lock_arrays.atomic[i] = 0;
  }
}

__global__ void init_lock_array_kernel_threadid(int N) {
  unsigned i = blockIdx.x*blockDim.x + threadIdx.x;
  if(i<(unsigned)N) {
    Kokkos::Impl::g_device_cuda_lock_arrays.scratch[i] = 0;
  }
}

} // namespace

namespace Impl {

CudaLockArrays g_host_cuda_lock_arrays = { nullptr, nullptr, 0 };

void initialize_host_cuda_lock_arrays() {
  if (g_host_cuda_lock_arrays.atomic != nullptr) return;
  CUDA_SAFE_CALL(cudaMalloc(&g_host_cuda_lock_arrays.atomic,
                 sizeof(int)*(CUDA_SPACE_ATOMIC_MASK+1)));
  CUDA_SAFE_CALL(cudaMalloc(&g_host_cuda_lock_arrays.scratch,
                 sizeof(int)*(Cuda::concurrency())));
  CUDA_SAFE_CALL(cudaDeviceSynchronize());
  g_host_cuda_lock_arrays.n = Cuda::concurrency();
  KOKKOS_COPY_CUDA_LOCK_ARRAYS_TO_DEVICE();
  init_lock_array_kernel_atomic<<<(CUDA_SPACE_ATOMIC_MASK+1+255)/256,256>>>();
  init_lock_array_kernel_threadid<<<(Kokkos::Cuda::concurrency()+255)/256,256>>>(Kokkos::Cuda::concurrency());
  CUDA_SAFE_CALL(cudaDeviceSynchronize());
}

void finalize_host_cuda_lock_arrays() {
  if (g_host_cuda_lock_arrays.atomic == nullptr) return;
  cudaFree(g_host_cuda_lock_arrays.atomic);
  g_host_cuda_lock_arrays.atomic = nullptr;
  cudaFree(g_host_cuda_lock_arrays.scratch);
  g_host_cuda_lock_arrays.scratch = nullptr;
  g_host_cuda_lock_arrays.n = 0;
#ifdef KOKKOS_ENABLE_CUDA_RELOCATABLE_DEVICE_CODE
  KOKKOS_COPY_CUDA_LOCK_ARRAYS_TO_DEVICE();
#endif
}

} // namespace Impl

} // namespace Kokkos

#else

void KOKKOS_CORE_SRC_CUDA_CUDA_LOCKS_PREVENT_LINK_ERROR() {}

#endif
