1 /* 2 * Copyright (c) 2025 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 HISTREAMER_FOUNDATION_OSAL_AUTO_SPIN_LOCK_H 17 #define HISTREAMER_FOUNDATION_OSAL_AUTO_SPIN_LOCK_H 18 19 #include <atomic> 20 21 namespace OHOS { 22 namespace Media { 23 24 class SpinLock { 25 public: test_and_set(std::memory_order order)26 bool test_and_set(std::memory_order order) 27 { 28 return spinLock_.test_and_set(order); 29 } 30 clear(std::memory_order order)31 void clear(std::memory_order order) 32 { 33 spinLock_.clear(order); 34 } 35 36 private: 37 std::atomic_flag spinLock_ = ATOMIC_FLAG_INIT; 38 }; 39 40 class AutoSpinLock { 41 public: AutoSpinLock(SpinLock & spinLock)42 explicit AutoSpinLock(SpinLock& spinLock) 43 : spinLock_(spinLock) 44 { 45 while (spinLock_.test_and_set(std::memory_order_acquire)); 46 } 47 48 AutoSpinLock(const AutoSpinLock&) = delete; 49 50 AutoSpinLock& operator=(const AutoSpinLock&) = delete; 51 ~AutoSpinLock()52 ~AutoSpinLock() 53 { 54 spinLock_.clear(std::memory_order_release); 55 } 56 57 private: 58 SpinLock& spinLock_; 59 }; 60 61 } // namespace Media 62 } // namespace OHOS 63 64 #endif // HISTREAMER_FOUNDATION_OSAL_AUTO_SPIN_LOCK_H 65