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// Copyright 2015 The Chromium 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEMORY_COORDINATOR_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEMORY_COORDINATOR_H_
#include "third_party/blink/public/platform/web_memory_pressure_level.h"
#include "third_party/blink/public/platform/web_memory_state.h"
#include "third_party/blink/public/platform/web_thread.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/noncopyable.h"
#include "third_party/blink/renderer/platform/wtf/threading_primitives.h"
namespace blink {
class PLATFORM_EXPORT MemoryCoordinatorClient : public GarbageCollectedMixin {
public:
virtual ~MemoryCoordinatorClient() = default;
// TODO(bashi): Deprecating. Remove this when MemoryPressureListener is
// gone.
virtual void OnMemoryPressure(WebMemoryPressureLevel) {}
virtual void OnMemoryStateChange(MemoryState) {}
virtual void OnPurgeMemory() {}
};
// MemoryCoordinator listens to some events which could be opportunities
// for reducing memory consumption and notifies its clients.
class PLATFORM_EXPORT MemoryCoordinator final
: public GarbageCollectedFinalized<MemoryCoordinator> {
WTF_MAKE_NONCOPYABLE(MemoryCoordinator);
public:
static MemoryCoordinator& Instance();
// Whether the device Blink runs on is a low-end device.
// Can be overridden in layout tests via internals.
static bool IsLowEndDevice();
// Returns true when available memory is low.
// This is not cheap and should not be called repeatedly.
// TODO(keishi): Remove when MemoryState is ready.
static bool IsCurrentlyLowMemory();
// Caches whether this device is a low-end device and the device physical
// memory in static members. instance() is not used as it's a heap allocated
// object - meaning it's not thread-safe as well as might break tests counting
// the heap size.
static void Initialize();
void RegisterThread(WebThread*) LOCKS_EXCLUDED(web_threads_mutex_);
void UnregisterThread(WebThread*) LOCKS_EXCLUDED(web_threads_mutex_);
void RegisterClient(MemoryCoordinatorClient*);
void UnregisterClient(MemoryCoordinatorClient*);
// TODO(bashi): Deprecating. Remove this when MemoryPressureListener is
// gone.
void OnMemoryPressure(WebMemoryPressureLevel);
void OnMemoryStateChange(MemoryState);
void OnPurgeMemory();
void Trace(blink::Visitor*);
private:
friend class Internals;
static void SetIsLowEndDeviceForTesting(bool);
MemoryCoordinator();
void ClearMemory();
static void ClearThreadSpecificMemory();
static bool is_low_end_device_;
HeapHashSet<WeakMember<MemoryCoordinatorClient>> clients_;
HashSet<WebThread*> web_threads_;
Mutex web_threads_mutex_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEMORY_COORDINATOR_H_
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