/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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#include <bufferhub/BufferHubIdGenerator.h>
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#include <log/log.h>
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namespace android {
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namespace frameworks {
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namespace bufferhub {
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namespace V1_0 {
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namespace implementation {
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BufferHubIdGenerator& BufferHubIdGenerator::getInstance() {
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static BufferHubIdGenerator generator;
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return generator;
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}
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int BufferHubIdGenerator::getId() {
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std::lock_guard<std::mutex> lock(mIdsInUseMutex);
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do {
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if (++mLastId >= std::numeric_limits<int>::max()) {
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mLastId = 0;
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}
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} while (mIdsInUse.find(mLastId) != mIdsInUse.end());
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mIdsInUse.insert(mLastId);
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return mLastId;
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}
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void BufferHubIdGenerator::freeId(int id) {
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std::lock_guard<std::mutex> lock(mIdsInUseMutex);
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auto iter = mIdsInUse.find(id);
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if (iter != mIdsInUse.end()) {
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mIdsInUse.erase(iter);
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} else {
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ALOGW("%s: Cannot free nonexistent id #%d", __FUNCTION__, id);
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}
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}
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} // namespace implementation
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} // namespace V1_0
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} // namespace bufferhub
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} // namespace frameworks
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} // namespace android
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