1/* Copyright 2015 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15
16#include "tensorflow/core/framework/op_segment.h"
17
18#include "tensorflow/core/framework/function.h"
19#include "tensorflow/core/framework/op_kernel.h"
20#include "tensorflow/core/lib/core/errors.h"
21#include "tensorflow/core/lib/gtl/map_util.h"
22#include "tensorflow/core/platform/logging.h"
23#include "tensorflow/core/platform/mutex.h"
24#include "tensorflow/core/platform/types.h"
25
26namespace tensorflow {
27
28OpSegment::Item::~Item() {
29 for (const auto& kv : name_kernel) delete kv.second;
30}
31
32OpSegment::OpSegment() {}
33
34OpSegment::~OpSegment() {
35 for (const auto& kv : sessions_) delete kv.second;
36}
37
38Status OpSegment::FindOrCreate(const string& session_handle,
39 const string& node_name, OpKernel** kernel,
40 CreateKernelFn create_fn) {
41 {
42 mutex_lock l(mu_);
43 auto item = gtl::FindPtrOrNull(sessions_, session_handle);
44 if (item == nullptr) {
45 return errors::NotFound("Session ", session_handle, " is not found.");
46 }
47 *kernel = gtl::FindPtrOrNull(item->name_kernel, node_name);
48 if (*kernel != nullptr) {
49 return OkStatus();
50 }
51 }
52 Status s = create_fn(kernel);
53 if (!s.ok()) {
54 LOG(ERROR) << "Create kernel failed: " << s;
55 return s;
56 }
57 {
58 mutex_lock l(mu_);
59 auto item = gtl::FindPtrOrNull(sessions_, session_handle);
60 if (item == nullptr) {
61 return errors::NotFound("Session ", session_handle, " is not found.");
62 }
63 OpKernel** p_kernel = &(item->name_kernel[node_name]);
64 if (*p_kernel == nullptr) {
65 *p_kernel = *kernel; // Inserts 'kernel' in the map.
66 } else {
67 delete *kernel;
68 *kernel = *p_kernel;
69 }
70 }
71 return OkStatus();
72}
73
74void OpSegment::AddHold(const string& session_handle) {
75 mutex_lock l(mu_);
76 Item** item = &sessions_[session_handle];
77 if (*item == nullptr) {
78 *item = new Item; // num_holds == 1
79 } else {
80 ++((*item)->num_holds);
81 }
82}
83
84void OpSegment::RemoveHold(const string& session_handle) {
85 Item* item = nullptr;
86 {
87 mutex_lock l(mu_);
88 auto siter = sessions_.find(session_handle);
89 if (siter == sessions_.end()) {
90 VLOG(1) << "Session " << session_handle << " is not found.";
91 return;
92 }
93 item = siter->second;
94 if (--(item->num_holds) > 0) {
95 return;
96 } else {
97 sessions_.erase(siter);
98 }
99 }
100 delete item;
101}
102
103bool OpSegment::ShouldOwnKernel(FunctionLibraryRuntime* lib,
104 const string& node_op) {
105 // OpSegment should not own kernel if the node is stateless, or a function.
106 return lib->IsStateful(node_op) &&
107 lib->GetFunctionLibraryDefinition()->Find(node_op) == nullptr &&
108 node_op != "PartitionedCall" && node_op != "StatefulPartitionedCall";
109}
110
111} // end namespace tensorflow
112