| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef INCLUDE_PERFETTO_EXT_TRACING_CORE_SHARED_MEMORY_H_ |
| #define INCLUDE_PERFETTO_EXT_TRACING_CORE_SHARED_MEMORY_H_ |
| |
| #include <stddef.h> |
| |
| #include <memory> |
| |
| #include "perfetto/base/export.h" |
| #include "perfetto/base/platform_handle.h" |
| |
| namespace perfetto { |
| |
| // An abstract interface that models the shared memory region shared between |
| // Service and Producer. The concrete implementation of this is up to the |
| // transport layer. This can be as simple as a malloc()-ed buffer, if both |
| // Producer and Service are hosted in the same process, or some posix shared |
| // memory for the out-of-process case (see src/unix_rpc). |
| // Both this class and the Factory are subclassed by the transport layer, which |
| // will attach platform specific fields to it (e.g., a unix file descriptor). |
| class PERFETTO_EXPORT_COMPONENT SharedMemory { |
| public: |
| class PERFETTO_EXPORT_COMPONENT Factory { |
| public: |
| virtual ~Factory(); |
| virtual std::unique_ptr<SharedMemory> CreateSharedMemory(size_t) = 0; |
| }; |
| |
| // The transport layer is expected to tear down the resource associated to |
| // this object region when destroyed. |
| virtual ~SharedMemory(); |
| |
| virtual void* start() const = 0; |
| virtual size_t size() const = 0; |
| }; |
| |
| } // namespace perfetto |
| |
| #endif // INCLUDE_PERFETTO_EXT_TRACING_CORE_SHARED_MEMORY_H_ |