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/*! \internal \file
 *
 * \brief May be used to implement PME-PP GPU comm interfaces for non-GPU builds.
 *
 * Currently, reports and exits if any of the interfaces are called.
 * Needed to satisfy compiler on systems, where CUDA is not available.
 *
 * \author Alan Gray <alang@nvidia.com>
 *
 * \ingroup module_ewald
 */
#include "gmxpre.h"

#include "config.h"

#include "gromacs/ewald/pme_force_sender_gpu.h"
#include "gromacs/gpu_utils/devicebuffer_datatype.h"
#include "gromacs/utility/arrayref.h"
#include "gromacs/utility/gmxassert.h"
#include "gromacs/utility/vectypes.h"

class DeviceContext;
class GpuEventSynchronizer;

namespace gmx
{

/*! \internal \brief Impl class stub. */
class PmeForceSenderGpu::Impl
{
};

/*!\brief Constructor stub. */
PmeForceSenderGpu::PmeForceSenderGpu(GpuEventSynchronizer* /*pmeForcesReady */,
                                     MPI_Comm /* comm     */,
                                     const DeviceContext& /* deviceContext */,
                                     gmx::ArrayRef<PpRanks> /* ppRanks */) :
    impl_(nullptr)
{
    GMX_ASSERT(!impl_,
               "A CPU stub for PME-PP GPU communication was called instead of the correct "
               "implementation.");
}

PmeForceSenderGpu::~PmeForceSenderGpu() = default;

/*!\brief init PME-PP GPU communication stub */
void PmeForceSenderGpu::setForceSendBuffer(DeviceBuffer<RVec> /* d_f */)
{
    GMX_ASSERT(!impl_,
               "A CPU stub for PME-PP GPU communication initialization was called instead of the "
               "correct implementation.");
}

void PmeForceSenderGpu::sendFToPpPeerToPeer(int /* ppRank */,
                                            int /* numAtoms */,
                                            bool /* sendForcesDirectToPpGpu */)
{
    GMX_ASSERT(!impl_,
               "A CPU stub for PME-PP GPU communication was called instead of the correct "
               "implementation.");
}

void PmeForceSenderGpu::sendFToPpGpuAwareMpi(DeviceBuffer<RVec> /* sendbuf */,
                                             int /* offset */,
                                             int /* numBytes */,
                                             int /* ppRank */,
                                             MPI_Request* /* request */)
{
    GMX_ASSERT(!impl_,
               "A CPU stub for PME-PP GPU communication was called instead of the correct "
               "implementation.");
}

void PmeForceSenderGpu::waitForEvents()
{
    GMX_ASSERT(!impl_,
               "A CPU stub for PME-PP GPU communication was called instead of the correct "
               "implementation.");
}


} // namespace gmx
