/*
* Copyright (C) 2014 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef PendingGCRunner_h
#define PendingGCRunner_h
#include "platform/heap/ThreadState.h"
#include "public/platform/WebThread.h"
namespace WebCore {
class PendingGCRunner : public blink::WebThread::TaskObserver {
public:
PendingGCRunner() : m_nesting(0) { }
~PendingGCRunner()
{
// m_nesting can be 1 if this was unregistered in a task and
// didProcessTask was not called.
ASSERT(!m_nesting || m_nesting == 1);
}
virtual void willProcessTask()
{
m_nesting++;
}
virtual void didProcessTask()
{
// In the production code WebKit::initialize is called from inside the
// message loop so we can get didProcessTask() without corresponding
// willProcessTask once. This is benign.
if (m_nesting)
m_nesting--;
WebCore::ThreadState* state = WebCore::ThreadState::current();
state->safePoint(m_nesting ? WebCore::ThreadState::HeapPointersOnStack : WebCore::ThreadState::NoHeapPointersOnStack);
}
private:
int m_nesting;
};
}
#endif