1 /* 2 * Copyright (c) 2017-2019 Arm Limited. 3 * 4 * SPDX-License-Identifier: MIT 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to 8 * deal in the Software without restriction, including without limitation the 9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in all 14 * copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22 * SOFTWARE. 23 */ 24 #ifndef __ARM_COMPUTE_MUTEX_H__ 25 #define __ARM_COMPUTE_MUTEX_H__ 26 27 #include <mutex> 28 29 namespace arm_compute 30 { 31 #ifndef NO_MULTI_THREADING 32 /** Wrapper of Mutex data-object */ 33 using Mutex = std::mutex; 34 35 /** Wrapper of lock_guard data-object */ 36 template <typename Mutex> 37 using lock_guard = std::lock_guard<Mutex>; 38 39 /** Wrapper of lock_guard data-object */ 40 template <typename Mutex> 41 using unique_lock = std::unique_lock<Mutex>; 42 #else /* NO_MULTI_THREADING */ 43 /** Wrapper implementation of Mutex data-object */ 44 class Mutex 45 { 46 public: 47 /** Default constructor */ 48 Mutex() = default; 49 /** Default destructor */ 50 ~Mutex() = default; 51 52 /** Lock */ 53 void lock() {}; 54 55 /** Unlock */ 56 void unlock() {}; 57 58 /** Try the lock. 59 * 60 * @return true. 61 */ 62 bool try_lock() 63 { 64 return true; 65 } 66 }; 67 68 /** Wrapper implementation of lock-guard data-object */ 69 template <typename Mutex> 70 class lock_guard 71 { 72 public: 73 typedef Mutex mutex_type; 74 75 public: 76 explicit lock_guard(Mutex &m_) 77 : m(m_) 78 { 79 } 80 ~lock_guard() 81 { 82 } 83 lock_guard(const lock_guard &) = delete; 84 85 private: 86 mutex_type &m; 87 }; 88 89 /** Wrapper implementation of unique-lock data-object */ 90 template <typename Mutex> 91 class unique_lock 92 { 93 public: 94 typedef Mutex mutex_type; 95 96 public: 97 unique_lock() noexcept : m(nullptr) 98 { 99 } 100 explicit unique_lock(mutex_type &m) 101 : m(&m) 102 { 103 } 104 unique_lock(const unique_lock &) = delete; 105 unique_lock(unique_lock &&) = default; 106 unique_lock &operator=(const unique_lock &) = delete; 107 unique_lock &operator=(unique_lock &&) = default; 108 ~unique_lock() = default; 109 void lock() 110 { 111 } 112 bool try_lock() 113 { 114 return true; 115 } 116 void unlock() 117 { 118 } 119 120 private: 121 mutex_type *m; 122 }; 123 #endif /* NO_MULTI_THREADING */ 124 } 125 #endif /* __ARM_COMPUTE_MUTEX_H__ */ 126