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// Copyright 2017 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_ARRAY_BUFFER_COLLECTOR_H_
#define V8_HEAP_ARRAY_BUFFER_COLLECTOR_H_
#include <vector>
#include "src/base/platform/mutex.h"
#include "src/objects/js-array-buffer.h"
namespace v8 {
namespace internal {
class Heap;
// To support background processing of array buffer backing stores, we process
// array buffers using the ArrayBufferTracker class. The ArrayBufferCollector
// keeps track of garbage backing stores so that they can be freed on a
// background thread.
class ArrayBufferCollector {
public:
explicit ArrayBufferCollector(Heap* heap) : heap_(heap) {}
~ArrayBufferCollector() { PerformFreeAllocations(); }
// These allocations will be either
// - freed immediately when under memory pressure, or
// - queued for freeing in FreeAllocations() or during tear down.
//
// FreeAllocations() potentially triggers a background task for processing.
void QueueOrFreeGarbageAllocations(
std::vector<std::shared_ptr<BackingStore>> allocations);
// Calls FreeAllocations() on a background thread.
void FreeAllocations();
private:
class FreeingTask;
// Begin freeing the allocations added through QueueOrFreeGarbageAllocations.
// Also called by TearDown.
void PerformFreeAllocations();
Heap* const heap_;
base::Mutex allocations_mutex_;
std::vector<std::vector<std::shared_ptr<BackingStore>>> allocations_;
};
} // namespace internal
} // namespace v8
#endif // V8_HEAP_ARRAY_BUFFER_COLLECTOR_H_