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82 lines
3.0 KiB
C++
82 lines
3.0 KiB
C++
/*
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* Copyright (C) 2011 Google Inc. All rights reserved.
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*
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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
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* are met:
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*
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY 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 OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef WebThread_h
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#define WebThread_h
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#include "WebCommon.h"
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#include <stdint.h>
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namespace blink {
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// Always an integer value.
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typedef uintptr_t PlatformThreadId;
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// Provides an interface to an embedder-defined thread implementation.
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//
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// Deleting the thread blocks until all pending, non-delayed tasks have been
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// run.
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class BLINK_PLATFORM_EXPORT WebThread {
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public:
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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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class BLINK_PLATFORM_EXPORT TaskObserver {
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public:
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virtual ~TaskObserver() { }
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virtual void willProcessTask() = 0;
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virtual void didProcessTask() = 0;
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};
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// postTask() and postDelayedTask() take ownership of the passed Task
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// object. It is safe to invoke postTask() and postDelayedTask() from any
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// thread.
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virtual void postTask(Task*) = 0;
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virtual void postDelayedTask(Task*, long long delayMs) = 0;
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virtual bool isCurrentThread() const = 0;
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virtual PlatformThreadId threadId() const { return 0; }
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virtual void addTaskObserver(TaskObserver*) { }
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virtual void removeTaskObserver(TaskObserver*) { }
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// enterRunLoop() processes tasks posted to this WebThread. This call does not return until some task calls exitRunLoop().
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// WebThread does not support nesting, meaning that once the run loop is entered for a given WebThread it is not valid to
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// call enterRunLoop() again.
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virtual void enterRunLoop() = 0;
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// exitRunLoop() runs tasks until there are no tasks available to run, then returns control to the caller of enterRunLoop().
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// Must be called when the WebThread is running.
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virtual void exitRunLoop() = 0;
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virtual ~WebThread() { }
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};
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} // namespace blink
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#endif
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