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// Copyright 2020 the V8 project 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 V8_HEAP_COLLECTION_BARRIER_H_
#define V8_HEAP_COLLECTION_BARRIER_H_
#include <atomic>
#include "src/base/optional.h"
#include "src/base/platform/condition-variable.h"
#include "src/base/platform/elapsed-timer.h"
#include "src/base/platform/mutex.h"
#include "src/heap/local-heap.h"
#include "src/logging/counters.h"
namespace v8 {
namespace internal {
class Heap;
// This class stops and resumes all background threads waiting for GC.
class CollectionBarrier {
public:
explicit CollectionBarrier(Heap* heap) : heap_(heap) {}
// Returns true when collection was requested.
bool WasGCRequested();
// Requests a GC from the main thread.
void RequestGC();
// Resumes all threads waiting for GC when tear down starts.
void NotifyShutdownRequested();
// Stops the TimeToCollection timer when starting the GC.
void StopTimeToCollectionTimer();
// Resumes threads waiting for collection.
void ResumeThreadsAwaitingCollection();
// This is the method use by background threads to request and wait for GC.
bool AwaitCollectionBackground(LocalHeap* local_heap);
private:
// Activate stack guards and posting a task to perform the GC.
void ActivateStackGuardAndPostTask();
Heap* heap_;
base::Mutex mutex_;
base::ConditionVariable cv_wakeup_;
base::ElapsedTimer timer_;
std::atomic<bool> collection_requested_{false};
bool block_for_collection_ = false;
bool shutdown_requested_ = false;
};
} // namespace internal
} // namespace v8
#endif // V8_HEAP_COLLECTION_BARRIER_H_
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