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// Copyright 2013 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 BASE_MEMORY_DISCARDABLE_MEMORY_EMULATED_H_
#define BASE_MEMORY_DISCARDABLE_MEMORY_EMULATED_H_
#include "base/memory/discardable_memory.h"
#include "base/memory/discardable_memory_manager.h"
namespace base {
namespace internal {
class DiscardableMemoryEmulated
: public DiscardableMemory,
public internal::DiscardableMemoryManagerAllocation {
public:
explicit DiscardableMemoryEmulated(size_t bytes);
virtual ~DiscardableMemoryEmulated();
static bool ReduceMemoryUsage();
// TODO(reveman): Remove this as it is breaking the discardable memory design
// principle that implementations should not rely on information this is
// unavailable in kernel space. crbug.com/400423
BASE_EXPORT static void ReduceMemoryUsageUntilWithinLimit(size_t bytes);
static void PurgeForTesting();
bool Initialize();
// Overridden from DiscardableMemory:
virtual DiscardableMemoryLockStatus Lock() OVERRIDE;
virtual void Unlock() OVERRIDE;
virtual void* Memory() const OVERRIDE;
// Overridden from internal::DiscardableMemoryManagerAllocation:
virtual bool AllocateAndAcquireLock() OVERRIDE;
virtual void ReleaseLock() OVERRIDE {}
virtual void Purge() OVERRIDE;
private:
const size_t bytes_;
scoped_ptr<uint8[]> memory_;
bool is_locked_;
DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryEmulated);
};
} // namespace internal
} // namespace base
#endif // BASE_MEMORY_DISCARDABLE_MEMORY_EMULATED_H_
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