1 // Copyright 2019 The SwiftShader Authors. All Rights Reserved. 2 // 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 #ifndef sw_RecursiveLock_hpp 16 #define sw_RecursiveLock_hpp 17 18 #include "Thread.hpp" 19 20 #include <mutex> 21 22 namespace sw 23 { 24 class RecursiveLock 25 { 26 public: RecursiveLock()27 RecursiveLock() 28 { 29 } 30 attemptLock()31 bool attemptLock() 32 { 33 return mutex.try_lock(); 34 } 35 lock()36 void lock() 37 { 38 mutex.lock(); 39 } 40 unlock()41 void unlock() 42 { 43 mutex.unlock(); 44 } 45 private: 46 std::recursive_mutex mutex; 47 }; 48 } 49 50 class RecursiveLockGuard 51 { 52 public: RecursiveLockGuard(sw::RecursiveLock & mutex)53 explicit RecursiveLockGuard(sw::RecursiveLock &mutex) : mutex(&mutex) 54 { 55 mutex.lock(); 56 } 57 RecursiveLockGuard(sw::RecursiveLock * mutex)58 explicit RecursiveLockGuard(sw::RecursiveLock *mutex) : mutex(mutex) 59 { 60 if (mutex) mutex->lock(); 61 } 62 ~RecursiveLockGuard()63 ~RecursiveLockGuard() 64 { 65 if (mutex) mutex->unlock(); 66 } 67 68 protected: 69 sw::RecursiveLock *mutex; 70 }; 71 72 #endif // sw_RecursiveLock_hpp 73