/* Copyright 2015 The TensorFlow Authors. All Rights Reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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==============================================================================*/
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#ifndef TENSORFLOW_CORE_COMMON_RUNTIME_DEVICE_MGR_H_
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#define TENSORFLOW_CORE_COMMON_RUNTIME_DEVICE_MGR_H_
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#include <memory>
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#include <string>
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#include <unordered_map>
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#include <unordered_set>
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#include <vector>
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#include "tensorflow/core/common_runtime/device.h"
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#include "tensorflow/core/lib/core/arena.h"
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#include "tensorflow/core/lib/core/status.h"
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#include "tensorflow/core/lib/core/stringpiece.h"
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#include "tensorflow/core/lib/gtl/inlined_vector.h"
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#include "tensorflow/core/platform/macros.h"
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namespace tensorflow {
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class DeviceAttributes;
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class DeviceMgr {
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public:
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// Constructs a DeviceMgr from a list of devices.
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// TODO(zhifengc): Other initialization information.
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explicit DeviceMgr(std::vector<std::unique_ptr<Device>> devices);
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// Constructs a DeviceMgr managing a single device.
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explicit DeviceMgr(std::unique_ptr<Device> device);
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// Returns attributes of all devices.
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void ListDeviceAttributes(std::vector<DeviceAttributes>* devices) const;
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// Returns raw pointers to the underlying devices.
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std::vector<Device*> ListDevices() const;
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// Returns a string listing all devices.
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string DebugString() const;
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// Returns a string of all the device mapping.
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string DeviceMappingString() const;
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// Assigns *device with pointer to Device of the given name.
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// Accepts either a full device name, or just the replica-local suffix.
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Status LookupDevice(StringPiece name, Device** device) const;
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// Clears given containers of all devices if 'container' is
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// non-empty. Otherwise, clears default containers of all devices.
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void ClearContainers(gtl::ArraySlice<string> containers) const;
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int NumDeviceType(const string& type) const;
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private:
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const std::vector<std::unique_ptr<Device>> devices_;
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StringPiece CopyToBackingStore(StringPiece s);
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std::unordered_map<StringPiece, Device*, StringPieceHasher> device_map_;
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core::Arena name_backing_store_; // Storage for keys in device_map_
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std::unordered_map<string, int> device_type_counts_;
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TF_DISALLOW_COPY_AND_ASSIGN(DeviceMgr);
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};
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} // namespace tensorflow
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#endif // TENSORFLOW_CORE_COMMON_RUNTIME_DEVICE_MGR_H_
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