1 // Copyright 2016 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_Resource_hpp 16 #define sw_Resource_hpp 17 18 #include "MutexLock.hpp" 19 20 namespace sw 21 { 22 enum Accessor 23 { 24 PUBLIC, // Application/API access 25 PRIVATE, // Renderer access, shared by multiple threads if read-only 26 MANAGED, // Renderer access, shared read/write access if partitioned 27 DESTRUCT 28 }; 29 30 class Resource 31 { 32 public: 33 Resource(size_t bytes); 34 35 void destruct(); // Asynchronous destructor 36 37 void *lock(Accessor claimer); 38 void *lock(Accessor relinquisher, Accessor claimer); 39 void unlock(); 40 void unlock(Accessor relinquisher); 41 42 const void *data() const; 43 const size_t size; 44 45 private: 46 ~Resource(); // Always call destruct() instead 47 48 BackoffLock criticalSection; 49 Event unblock; 50 volatile int blocked; 51 52 volatile Accessor accessor; 53 volatile int count; 54 bool orphaned; 55 56 void *buffer; 57 }; 58 } 59 60 #endif // sw_Resource_hpp 61
