/******************************************************************************
 * Copyright (c) 2024 Advanced Micro Devices, Inc. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *****************************************************************************/

#include "mpi_init_singleton.hpp"

namespace rocshmem {

MPIInitSingleton* MPIInitSingleton::instance{nullptr};

MPIInitSingleton::MPIInitSingleton() {
  MPI_Initialized(&pre_init_done);

  if (!pre_init_done) {
    int provided;
    MPI_Init_thread(nullptr, nullptr, MPI_THREAD_MULTIPLE, &provided);
  }

  MPI_Comm_size(MPI_COMM_WORLD, &nprocs_);
  MPI_Comm_rank(MPI_COMM_WORLD, &my_rank_);
}

MPIInitSingleton::~MPIInitSingleton() {
  int finalized{0};
  MPI_Finalized(&finalized);
  if (!finalized && !pre_init_done) {
    MPI_Finalize();
  }
}

MPIInitSingleton* MPIInitSingleton::GetInstance() {
  if (!instance) {
    instance = new MPIInitSingleton();
    return instance;
  }
  return instance;
}

int MPIInitSingleton::get_rank() { return my_rank_; }

int MPIInitSingleton::get_nprocs() { return nprocs_; }

}  // namespace rocshmem