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