| /* |
| * 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/renderer/platform/cross_thread_functional.h" |
| #include "third_party/blink/renderer/platform/heap/thread_state.h" |
| #include "third_party/blink/renderer/platform/scheduler/public/thread.h" |
| |
| namespace blink { |
| |
| class GCTaskObserver final : public Thread::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(Thread* 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_; |
| Thread* thread_; |
| }; |
| |
| } // namespace blink |
| |
| #endif |