1 /* 2 * Copyright (C) 2019 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 #define DEBUG false // STOPSHIP if true 18 #include "Log.h" 19 20 #include "LogEventQueue.h" 21 22 namespace android { 23 namespace os { 24 namespace statsd { 25 26 using std::unique_lock; 27 using std::unique_ptr; 28 29 unique_ptr<LogEvent> LogEventQueue::waitPop() { 30 std::unique_lock<std::mutex> lock(mMutex); 31 32 if (mQueue.empty()) { 33 mCondition.wait(lock, [this] { return !this->mQueue.empty(); }); 34 } 35 36 unique_ptr<LogEvent> item = std::move(mQueue.front()); 37 mQueue.pop(); 38 39 return item; 40 } 41 42 bool LogEventQueue::push(unique_ptr<LogEvent> item, int64_t* oldestTimestampNs) { 43 bool success; 44 { 45 std::unique_lock<std::mutex> lock(mMutex); 46 if (mQueue.size() < mQueueLimit) { 47 mQueue.push(std::move(item)); 48 success = true; 49 } else { 50 // safe operation as queue must not be empty. 51 *oldestTimestampNs = mQueue.front()->GetElapsedTimestampNs(); 52 success = false; 53 } 54 } 55 56 mCondition.notify_one(); 57 return success; 58 } 59 60 } // namespace statsd 61 } // namespace os 62 } // namespace android 63
