/* Copyright 2017 The TensorFlow Authors. 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 TENSORFLOW_KERNELS_TRAINING_OP_HELPERS_H_
#define TENSORFLOW_KERNELS_TRAINING_OP_HELPERS_H_

#include "tensorflow/core/framework/op_kernel.h"

namespace tensorflow {

mutex* GetTrainingVariableMutex(OpKernelContext* ctx, int input);

std::vector<mutex_lock> MaybeLockVariableInputMutexesInOrder(
    OpKernelContext* ctx, bool do_lock, const std::vector<int>& input_ids);

Status GetInputTensorFromVariable(OpKernelContext* ctx, int input,
                                  bool lock_held, Tensor* out);

void MaybeForwardRefInputToRefOutput(OpKernelContext* ctx, int input,
                                     int output);

}  // end namespace tensorflow

#endif  // TENSORFLOW_KERNELS_TRAINING_OP_HELPERS_H_
