ExternalContext.h

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/*
 * Copyright (c) 2020 Samsung Electronics Co., Ltd. All Rights Reserved
 *
 * 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.
 */
 
#ifndef __ONERT_BACKEND_BUILTIN_EXTERNAL_CONTEXT_H__
#define __ONERT_BACKEND_BUILTIN_EXTERNAL_CONTEXT_H__
 
#include <util/ConfigSource.h>
 
#include <ruy/context.h>
#include <ruy/context_get_ctx.h>
#include <ruy/ctx.h>
#include <ruy/tune.h>
 
#include <memory>
 
namespace onert
{
namespace backend
{
namespace builtin
{
 
// TODO Unify this with cpu::ExternalContext
class ExternalContext
{
private:
  static const int kDefaultNumThreadpoolThreads = 1;
 
public:
  ExternalContext() : _ruy_context(std::make_unique<ruy::Context>())
  {
    setMaxNumThreads(onert::util::getConfigInt(onert::util::config::NUM_THREADS));
    initPerThreadState();
  }
 
  void setMaxNumThreads(int max_num_threads)
  {
    const int target_num_threads =
      max_num_threads > -1 ? max_num_threads : kDefaultNumThreadpoolThreads;
    _ruy_context->set_max_num_threads(target_num_threads);
  }
 
  ruy::Context *ruy_context() const { return _ruy_context.get(); }
 
private:
  void initPerThreadState()
  {
    // Initialize per-thread state.
    const int thread_count = _ruy_context->max_num_threads();
    auto ctx = ruy::get_ctx(_ruy_context.get());
    ctx->EnsureThreadSpecificResources(thread_count);
    for (int i = 0; i < thread_count; i++)
    {
      ctx->GetThreadSpecificTuningResolver(i)->SetTuning(ctx->explicit_tuning());
    }
  }
 
private:
  const std::unique_ptr<ruy::Context> _ruy_context;
};
 
} // namespace builtin
} // namespace backend
} // namespace onert
 
#endif // __ONERT_BACKEND_BUILTIN_EXTERNAL_CONTEXT_H__