1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "Callbacks.h"
18 #include <android-base/logging.h>
19
20 namespace android {
21 namespace hardware {
22 namespace neuralnetworks {
23 namespace V1_0 {
24 namespace implementation {
25
CallbackBase()26 CallbackBase::CallbackBase() : mNotified(false) {}
27
~CallbackBase()28 CallbackBase::~CallbackBase() {
29 // Note that we cannot call CallbackBase::join_thread from here:
30 // CallbackBase is intended to be reference counted, and it is possible that
31 // the reference count drops to zero in the bound thread, causing the
32 // bound thread to call this destructor. If a thread tries to join
33 // itself, it throws an exception, producing a message like the
34 // following:
35 //
36 // terminating with uncaught exception of type std::__1::system_error:
37 // thread::join failed: Resource deadlock would occur
38 }
39
wait()40 void CallbackBase::wait() {
41 std::unique_lock<std::mutex> lock(mMutex);
42 mCondition.wait(lock, [this]{return mNotified;});
43 join_thread_locked();
44 }
45
on_finish(std::function<bool (void)> post_work)46 bool CallbackBase::on_finish(std::function<bool(void)> post_work) {
47 std::lock_guard<std::mutex> lock(mMutex);
48 if (mPostWork != nullptr) {
49 LOG(ERROR) << "CallbackBase::on_finish -- a post-work function has already been bound to "
50 "this callback object";
51 return false;
52 }
53 if (post_work == nullptr) {
54 LOG(ERROR) << "CallbackBase::on_finish -- the new post-work function is invalid";
55 return false;
56 }
57 mPostWork = std::move(post_work);
58 return true;
59 }
60
bind_thread(std::thread && asyncThread)61 bool CallbackBase::bind_thread(std::thread&& asyncThread) {
62 std::lock_guard<std::mutex> lock(mMutex);
63 if (mThread.joinable()) {
64 LOG(ERROR) << "CallbackBase::bind_thread -- a thread has already been bound to this "
65 "callback object";
66 return false;
67 }
68 if (!asyncThread.joinable()) {
69 LOG(ERROR) << "CallbackBase::bind_thread -- the new thread is not joinable";
70 return false;
71 }
72 mThread = std::move(asyncThread);
73 return true;
74 }
75
join_thread()76 void CallbackBase::join_thread() {
77 std::lock_guard<std::mutex> lock(mMutex);
78 join_thread_locked();
79 }
80
notify()81 void CallbackBase::notify() {
82 {
83 std::lock_guard<std::mutex> lock(mMutex);
84 mNotified = true;
85 if (mPostWork != nullptr) {
86 bool success = mPostWork();
87 if (!success) {
88 LOG(ERROR) << "CallbackBase::notify -- post work failed";
89 }
90 }
91 }
92 mCondition.notify_all();
93 }
94
join_thread_locked()95 void CallbackBase::join_thread_locked() {
96 if (mThread.joinable()) {
97 mThread.join();
98 }
99 }
100
PreparedModelCallback()101 PreparedModelCallback::PreparedModelCallback() :
102 mErrorStatus(ErrorStatus::GENERAL_FAILURE), mPreparedModel(nullptr) {}
103
~PreparedModelCallback()104 PreparedModelCallback::~PreparedModelCallback() {}
105
notify(ErrorStatus errorStatus,const sp<IPreparedModel> & preparedModel)106 Return<void> PreparedModelCallback::notify(ErrorStatus errorStatus,
107 const sp<IPreparedModel>& preparedModel) {
108 mErrorStatus = errorStatus;
109 mPreparedModel = preparedModel;
110 CallbackBase::notify();
111 return Void();
112 }
113
getStatus()114 ErrorStatus PreparedModelCallback::getStatus() {
115 wait();
116 return mErrorStatus;
117 }
118
getPreparedModel()119 sp<IPreparedModel> PreparedModelCallback::getPreparedModel() {
120 wait();
121 return mPreparedModel;
122 }
123
ExecutionCallback()124 ExecutionCallback::ExecutionCallback() : mErrorStatus(ErrorStatus::GENERAL_FAILURE) {}
125
~ExecutionCallback()126 ExecutionCallback::~ExecutionCallback() {}
127
notify(ErrorStatus errorStatus)128 Return<void> ExecutionCallback::notify(ErrorStatus errorStatus) {
129 mErrorStatus = errorStatus;
130 CallbackBase::notify();
131 return Void();
132 }
133
getStatus()134 ErrorStatus ExecutionCallback::getStatus() {
135 wait();
136 return mErrorStatus;
137 }
138
139 } // namespace implementation
140 } // namespace V1_0
141 } // namespace neuralnetworks
142 } // namespace hardware
143 } // namespace android
144