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/*
* 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_GC_TASK_RUNNER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_GC_TASK_RUNNER_H_
#include <memory>
#include "base/location.h"
#include "third_party/blink/public/platform/web_thread.h"
#include "third_party/blink/renderer/platform/cross_thread_functional.h"
#include "third_party/blink/renderer/platform/heap/thread_state.h"
namespace blink {
class GCTaskObserver final : public WebThread::TaskObserver {
USING_FAST_MALLOC(GCTaskObserver);
public:
GCTaskObserver() : nesting_(0) {}
~GCTaskObserver() override {
// m_nesting can be 1 if this was unregistered in a task and
// didProcessTask was not called.
DCHECK(!nesting_ || nesting_ == 1);
}
void WillProcessTask() override { nesting_++; }
void DidProcessTask() override {
// 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 (nesting_)
nesting_--;
ThreadState::Current()->SafePoint(nesting_
? BlinkGC::kHeapPointersOnStack
: BlinkGC::kNoHeapPointersOnStack);
}
private:
int nesting_;
};
class GCTaskRunner final {
USING_FAST_MALLOC(GCTaskRunner);
public:
explicit GCTaskRunner(WebThread* thread)
: gc_task_observer_(std::make_unique<GCTaskObserver>()), thread_(thread) {
thread_->AddTaskObserver(gc_task_observer_.get());
}
~GCTaskRunner() { thread_->RemoveTaskObserver(gc_task_observer_.get()); }
private:
std::unique_ptr<GCTaskObserver> gc_task_observer_;
WebThread* thread_;
};
} // namespace blink
#endif
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