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// Copyright 2014 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_SHMEM_ALLOCATOR_H_
#define BASE_MEMORY_DISCARDABLE_MEMORY_SHMEM_ALLOCATOR_H_
#include "base/base_export.h"
#include "base/memory/scoped_ptr.h"
namespace base {
// TODO(reveman): Remove this by having allocator interface return
// real DiscardableMemory instances. crbug.com/442945
class BASE_EXPORT DiscardableMemoryShmemChunk {
public:
virtual ~DiscardableMemoryShmemChunk() {}
virtual bool Lock() = 0;
virtual void Unlock() = 0;
virtual void* Memory() const = 0;
virtual bool IsMemoryResident() const = 0;
};
class BASE_EXPORT DiscardableMemoryShmemAllocator {
public:
// Returns the allocator instance.
static DiscardableMemoryShmemAllocator* GetInstance();
// Sets the allocator instance. Can only be called once, e.g. on startup.
// Ownership of |instance| remains with the caller.
static void SetInstance(DiscardableMemoryShmemAllocator* allocator);
virtual scoped_ptr<DiscardableMemoryShmemChunk>
AllocateLockedDiscardableMemory(size_t size) = 0;
protected:
virtual ~DiscardableMemoryShmemAllocator() {}
};
} // namespace base
#endif // BASE_MEMORY_DISCARDABLE_MEMORY_SHMEM_ALLOCATOR_H_
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