Line data    Source code

       1              : /**
       2              :  * Copyright (c) 2025 Huawei Technologies Co., Ltd.
       3              :  * This program is free software, you can redistribute it and/or modify it under the terms and conditions of
       4              :  * CANN Open Software License Agreement Version 2.0 (the "License").
       5              :  * Please refer to the License for details. You may not use this file except in compliance with the License.
       6              :  * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED,
       7              :  * INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
       8              :  * See LICENSE in the root of the software repository for the full text of the License.
       9              :  */
      10              : 
      11              : #ifndef HCCL_SPIN_MUTEX_H
      12              : #define HCCL_SPIN_MUTEX_H
      13              : 
      14              : #include <mutex>
      15              : #include <atomic>
      16              : 
      17              : namespace hccl {
      18              : 
      19              : class SpinMutex {
      20              : public:
      21            2 :     SpinMutex() = default;
      22              :     ~SpinMutex() = default;
      23              :     // delete copy and move constructors and assign operators
      24              :     SpinMutex(SpinMutex const&) = delete;            // Copy construct
      25              :     SpinMutex(SpinMutex&&) = delete;                 // Move construct
      26              :     SpinMutex& operator=(SpinMutex const&) = delete; // Copy assign
      27              :     SpinMutex& operator=(SpinMutex&&) = delete;      // Move assign
      28            2 :     void lock()
      29              :     {
      30            2 :         bool expected = false;
      31            2 :         while (!flag.compare_exchange_strong(expected, true)) {
      32            0 :             expected = false;
      33              :         }
      34            2 :     }
      35            2 :     void unlock() { flag.store(false); }
      36              : 
      37              : private:
      38              :     std::atomic<bool> flag = ATOMIC_VAR_INIT(false);
      39              : };
      40              : } // namespace hccl
      41              : #endif // HCCL_SPIN_MUTEX_H