text: /**
   * Copyright 2019 Huawei Technologies Co., Ltd
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include "device/gpu/distribution/collective_init.h"
  #include "utils/log_adapter.h"
  
  namespace mindspore {
  namespace device {
  namespace gpu {
  CollectiveInitializer& CollectiveInitializer::instance() {
    static CollectiveInitializer instance = {};
    return instance;
  }
  
  bool CollectiveInitializer::collective_inited() const { return collective_inited_; }
  
  const void* CollectiveInitializer::collective_handle() const { return collective_handle_; }
  
  void CollectiveInitializer::InitCollective() {
    void* handle = dlopen("libgpu_collective.so", RTLD_LAZY);
    if (handle == nullptr) {
      MS_LOG(EXCEPTION)
        << "Loading libgpu_collective.so failed. Many reasons could cause this:\n1.libgpu_collective.so is not "
           "installed.\n2.nccl is not "
           "installed or found.\n3.mpi is not installed or found";
    }
    auto mpi_init_funcptr = reinterpret_cast<InitMPI>(dlsym(handle, "InitMPI"));
    MS_EXCEPTION_IF_NULL(mpi_init_funcptr);
    (*mpi_init_funcptr)();
  
    CollectiveInitializer::instance().collective_inited_ = true;
    CollectiveInitializer::instance().collective_handle_ = handle;
  }
  
  void CollectiveInitializer::FinalizeCollective() {
    if (CollectiveInitializer::instance().collective_handle_ != nullptr) {
      if (dlclose(CollectiveInitializer::instance().collective_handle_) != 0) {
        MS_LOG(EXCEPTION) << "Closing libgpu_collective.so handle failed.";
      }
    }
  }
  }  // namespace gpu
  }  // namespace device
  }  // namespace mindspore
  