You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
71 lines
2.0 KiB
71 lines
2.0 KiB
// Copyright 2013 the V8 project authors. All rights reserved. |
|
// Use of this source code is governed by a BSD-style license that can be |
|
// found in the LICENSE file. |
|
|
|
#ifndef V8_V8_PLATFORM_H_ |
|
#define V8_V8_PLATFORM_H_ |
|
|
|
namespace v8 { |
|
|
|
class Isolate; |
|
|
|
/** |
|
* 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 |
|
}; |
|
|
|
virtual ~Platform() {} |
|
|
|
/** |
|
* 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; |
|
|
|
/** |
|
* Monotonically increasing time in seconds from an arbitrary fixed point in |
|
* the past. This function is expected to return at least |
|
* millisecond-precision values. For this reason, |
|
* it is recommended that the fixed point be no further in the past than |
|
* the epoch. |
|
**/ |
|
virtual double MonotonicallyIncreasingTime() = 0; |
|
}; |
|
|
|
} // namespace v8 |
|
|
|
#endif // V8_V8_PLATFORM_H_
|
|
|