| // Copyright 2013 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef V8_V8_PLATFORM_H_ |
| #define V8_V8_PLATFORM_H_ |
| |
| #include "v8.h" |
| |
| namespace v8 { |
| |
| /** |
| * A Task represents a unit of work. |
| */ |
| class Task { |
| public: |
| virtual ~Task() {} |
| |
| virtual void Run() = 0; |
| }; |
| |
| /** |
| * V8 Platform abstraction layer. |
| * |
| * The embedder has to provide an implementation of this interface before |
| * initializing the rest of V8. |
| */ |
| class Platform { |
| public: |
| /** |
| * This enum is used to indicate whether a task is potentially long running, |
| * or causes a long wait. The embedder might want to use this hint to decide |
| * whether to execute the task on a dedicated thread. |
| */ |
| enum ExpectedRuntime { |
| kShortRunningTask, |
| kLongRunningTask |
| }; |
| |
| /** |
| * Schedules a task to be invoked on a background thread. |expected_runtime| |
| * indicates that the task will run a long time. The Platform implementation |
| * takes ownership of |task|. There is no guarantee about order of execution |
| * of tasks wrt order of scheduling, nor is there a guarantee about the |
| * thread the task will be run on. |
| */ |
| virtual void CallOnBackgroundThread(Task* task, |
| ExpectedRuntime expected_runtime) = 0; |
| |
| /** |
| * Schedules a task to be invoked on a foreground thread wrt a specific |
| * |isolate|. Tasks posted for the same isolate should be execute in order of |
| * scheduling. The definition of "foreground" is opaque to V8. |
| */ |
| virtual void CallOnForegroundThread(Isolate* isolate, Task* task) = 0; |
| |
| protected: |
| virtual ~Platform() {} |
| }; |
| |
| } // namespace v8 |
| |
| #endif // V8_V8_PLATFORM_H_ |