1 /* 2 * Copyright (c) 2022 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef HDI_SHARED_MEM_QUEUE_SYNCER_H 17 #define HDI_SHARED_MEM_QUEUE_SYNCER_H 18 19 #include <atomic> 20 #include <parcel.h> 21 #include <stdint.h> 22 23 namespace OHOS { 24 namespace HDI { 25 namespace Base { 26 class SharedMemQueueSyncer { 27 public: 28 explicit SharedMemQueueSyncer(std::atomic<uint32_t> *syncerPtr); 29 ~SharedMemQueueSyncer() = default; 30 enum SyncWord : uint32_t { 31 SYNC_WORD_WRITE = 0x01, 32 SYNC_WORD_READ = 0x02, 33 }; 34 35 int Wait(uint32_t bitset, int64_t timeoutNanoSec); 36 int Wake(uint32_t bitset); 37 38 private: 39 int FutexWait(uint32_t bitset, int64_t timeoutNanoSec); 40 void TimeoutToRealtime(int64_t timeout, struct timespec &realtime); 41 std::atomic<uint32_t> *syncAddr_; 42 }; 43 } // namespace Base 44 } // namespace HDI 45 } // namespace OHOS 46 47 #endif /* HDI_SHARED_MEM_QUEUE_SYNCER_H */ 48