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79 lines
2.6 KiB
79 lines
2.6 KiB
// Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "paddle/fluid/operators/detail/safe_ref.h"
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#include "paddle/fluid/operators/reader/reader_op_registry.h"
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namespace paddle {
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namespace operators {
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namespace reader {
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class ThreadedReader : public framework::DecoratedReader {
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public:
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explicit ThreadedReader(ReaderBase* reader) : DecoratedReader(reader) {}
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void ReadNext(std::vector<framework::LoDTensor>* out) override {
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std::lock_guard<std::mutex> lock(mutex_);
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reader_->ReadNext(out);
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}
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void ReInit() override { reader_->ReInit(); }
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private:
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std::mutex mutex_;
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};
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class CreateThreadedReaderOp : public framework::OperatorBase {
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public:
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using framework::OperatorBase::OperatorBase;
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private:
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void RunImpl(const framework::Scope& scope,
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const platform::Place& dev_place) const override {
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auto* out = detail::Ref(scope.FindVar(Output("Out")))
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.GetMutable<framework::ReaderHolder>();
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if (out->Get() != nullptr) {
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return;
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}
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const auto& underlying_reader = scope.FindVar(Input("UnderlyingReader"))
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->Get<framework::ReaderHolder>();
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out->Reset(new ThreadedReader(underlying_reader.Get()));
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}
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};
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class CreateThreadedReaderOpMaker : public DecoratedReaderMakerBase {
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protected:
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void Apply() override {
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AddComment(R"DOC(
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CreateThreadedReader Operator
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This operator creates a threaded reader. A threaded reader's
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'ReadNext()' can be invoked by several threads at the same
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time.
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When the attribute 'safe_mode' is true, the threaded reader's
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'ReInit()' is disabled to avoid unexpected bugs in multi-thread
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environment.
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)DOC");
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}
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};
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} // namespace reader
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} // namespace operators
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} // namespace paddle
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namespace reader = paddle::operators::reader;
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REGISTER_DECORATED_READER_OPERATOR(create_threaded_reader,
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reader::CreateThreadedReaderOp,
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reader::CreateThreadedReaderOpMaker);
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