| // 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_ |