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// Copyright 2014 The Chromium 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 WebThreadSupportingGC_h
#define WebThreadSupportingGC_h
#include "platform/heap/GCTaskRunner.h"
#include "public/platform/Platform.h"
#include "public/platform/WebTaskRunner.h"
#include "public/platform/WebThread.h"
#include "wtf/Allocator.h"
#include "wtf/Noncopyable.h"
#include "wtf/OwnPtr.h"
#include "wtf/PassOwnPtr.h"
namespace blink {
// WebThreadSupportingGC wraps a WebThread and adds support for attaching
// to and detaching from the Blink GC infrastructure. The initialize method
// must be called during initialization on the WebThread and before the
// thread allocates any objects managed by the Blink GC. The shutdown
// method must be called on the WebThread during shutdown when the thread
// no longer needs to access objects managed by the Blink GC.
//
// WebThreadSupportingGC usually internally creates and owns WebThread unless
// an existing WebThread is given via createForThread.
class PLATFORM_EXPORT WebThreadSupportingGC final {
USING_FAST_MALLOC(WebThreadSupportingGC);
WTF_MAKE_NONCOPYABLE(WebThreadSupportingGC);
public:
static PassOwnPtr<WebThreadSupportingGC> create(const char* name);
static PassOwnPtr<WebThreadSupportingGC> createForThread(WebThread*);
~WebThreadSupportingGC();
void postTask(const WebTraceLocation& location, WebTaskRunner::Task* task)
{
m_thread->taskRunner()->postTask(location, task);
}
void postDelayedTask(const WebTraceLocation& location, WebTaskRunner::Task* task, long long delayMs)
{
m_thread->taskRunner()->postDelayedTask(location, task, delayMs);
}
bool isCurrentThread() const
{
return m_thread->isCurrentThread();
}
void addTaskObserver(WebThread::TaskObserver* observer)
{
m_thread->addTaskObserver(observer);
}
void removeTaskObserver(WebThread::TaskObserver* observer)
{
m_thread->removeTaskObserver(observer);
}
void initialize();
void shutdown();
WebThread& platformThread() const
{
ASSERT(m_thread);
return *m_thread;
}
private:
WebThreadSupportingGC(const char* name, WebThread*);
OwnPtr<GCTaskRunner> m_gcTaskRunner;
// m_thread is guaranteed to be non-null after this instance is constructed.
// m_owningThread is non-null unless this instance is constructed for an
// existing thread via createForThread().
WebThread* m_thread = nullptr;
OwnPtr<WebThread> m_owningThread;
};
} // namespace blink
#endif
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