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1 // Copyright 2013 the V8 project authors. All rights reserved. | |
2 // Redistribution and use in source and binary forms, with or without | |
3 // modification, are permitted provided that the following conditions are | |
4 // met: | |
5 // | |
6 // * Redistributions of source code must retain the above copyright | |
7 // notice, this list of conditions and the following disclaimer. | |
8 // * Redistributions in binary form must reproduce the above | |
9 // copyright notice, this list of conditions and the following | |
10 // disclaimer in the documentation and/or other materials provided | |
11 // with the distribution. | |
12 // * Neither the name of Google Inc. nor the names of its | |
13 // contributors may be used to endorse or promote products derived | |
14 // from this software without specific prior written permission. | |
15 // | |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 | |
28 #ifndef V8_V8_PLATFORM_H_ | |
29 #define V8_V8_PLATFORM_H_ | |
30 | |
31 #include "v8.h" | |
32 | |
33 namespace v8 { | |
34 | |
35 /** | |
36 * A Task represents a unit of work. | |
37 */ | |
38 class Task { | |
39 public: | |
40 virtual ~Task() {} | |
41 | |
42 virtual void Run() = 0; | |
43 }; | |
44 | |
45 /** | |
46 * V8 Platform abstraction layer. | |
47 * | |
48 * The embedder has to provide an implementation of this interface before | |
49 * initializing the rest of V8. | |
50 */ | |
51 class Platform { | |
52 public: | |
53 /** | |
54 * Schedules a task to be invoked on a background thread. |task_is_slow| | |
55 * indicates that the task will run a long time. The Platform implementation | |
56 * takes ownership of |task|. There is no guarantee about order of execution | |
57 * of tasks wrt order of scheduling, nor is there a guarantee about the | |
58 * thread the task will be run on. | |
59 */ | |
60 virtual void CallOnBackgroundThread(Task* task, bool task_is_slow) = 0; | |
61 | |
62 /** | |
63 * Schedules a task to be invoked on a foreground thread wrt a specific | |
64 * |isolate|. Tasks posted for the same isolate should be execute in order of | |
65 * scheduling. The definition of "foreground" is opaque to V8. | |
66 */ | |
67 virtual void CallOnForegroundThread(Isolate* isolate, Task* task) = 0; | |
68 | |
69 protected: | |
70 virtual ~Platform() {} | |
71 }; | |
72 | |
73 } // namespace v8 | |
74 | |
75 #endif // V8_V8_PLATFORM_H_ | |
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