1 /* 2 * Copyright (C) 2018 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 <bufferhub/BufferHubIdGenerator.h> 18 #include <log/log.h> 19 20 namespace android { 21 namespace frameworks { 22 namespace bufferhub { 23 namespace V1_0 { 24 namespace implementation { 25 getInstance()26 BufferHubIdGenerator& BufferHubIdGenerator::getInstance() { 27 static BufferHubIdGenerator generator; 28 29 return generator; 30 } 31 getId()32 int BufferHubIdGenerator::getId() { 33 std::lock_guard<std::mutex> lock(mIdsInUseMutex); 34 35 do { 36 if (++mLastId >= std::numeric_limits<int>::max()) { 37 mLastId = 0; 38 } 39 } while (mIdsInUse.find(mLastId) != mIdsInUse.end()); 40 41 mIdsInUse.insert(mLastId); 42 return mLastId; 43 } 44 freeId(int id)45 void BufferHubIdGenerator::freeId(int id) { 46 std::lock_guard<std::mutex> lock(mIdsInUseMutex); 47 auto iter = mIdsInUse.find(id); 48 if (iter != mIdsInUse.end()) { 49 mIdsInUse.erase(iter); 50 } else { 51 ALOGW("%s: Cannot free nonexistent id #%d", __FUNCTION__, id); 52 } 53 } 54 55 } // namespace implementation 56 } // namespace V1_0 57 } // namespace bufferhub 58 } // namespace frameworks 59 } // namespace android 60