1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SRC_TRACING_TEST_TEST_SHARED_MEMORY_H_ 18 #define SRC_TRACING_TEST_TEST_SHARED_MEMORY_H_ 19 20 #include <stddef.h> 21 22 #include <memory> 23 24 #include "perfetto/ext/tracing/core/shared_memory.h" 25 #include "src/tracing/core/in_process_shared_memory.h" 26 27 namespace perfetto { 28 29 // A dummy implementation of shared memory for single process unittests 30 // (just a wrapper around malloc() that fits the SharedMemory API). 31 using TestSharedMemory = InProcessSharedMemory; 32 33 // An implementation of the SharedMemory that doesn't own any memory, but just 34 // points to memory owned by another SharedMemory. 35 // 36 // This is useful to test two components that own separate SharedMemory that 37 // really point to the same memory underneath without setting up real posix 38 // shared memory. 39 class TestRefSharedMemory : public SharedMemory { 40 public: 41 // N.B. `*mem` must outlive `*this`. TestRefSharedMemory(SharedMemory * mem)42 explicit TestRefSharedMemory(SharedMemory* mem) 43 : start_(mem->start()), size_(mem->size()) {} 44 ~TestRefSharedMemory() override; 45 Create(SharedMemory * mem)46 static std::unique_ptr<TestRefSharedMemory> Create(SharedMemory* mem) { 47 return std::make_unique<TestRefSharedMemory>(mem); 48 } 49 50 // SharedMemory implementation. 51 using SharedMemory::start; // Equal priority to const and non-const versions 52 const void* start() const override; 53 size_t size() const override; 54 55 private: 56 void* start_; 57 size_t size_; 58 }; 59 60 } // namespace perfetto 61 62 #endif // SRC_TRACING_TEST_TEST_SHARED_MEMORY_H_ 63