1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_MEMORY_DISCARDABLE_MEMORY_ASHMEM_H_ 6 #define BASE_MEMORY_DISCARDABLE_MEMORY_ASHMEM_H_ 7 8 #include "base/memory/discardable_memory.h" 9 10 #include "base/macros.h" 11 #include "base/memory/discardable_memory_manager.h" 12 13 namespace base { 14 namespace internal { 15 16 class DiscardableAshmemChunk; 17 class DiscardableMemoryAshmemAllocator; 18 class DiscardableMemoryManager; 19 20 class DiscardableMemoryAshmem 21 : public DiscardableMemory, 22 public internal::DiscardableMemoryManagerAllocation { 23 public: 24 explicit DiscardableMemoryAshmem(size_t bytes, 25 DiscardableMemoryAshmemAllocator* allocator, 26 DiscardableMemoryManager* manager); 27 28 virtual ~DiscardableMemoryAshmem(); 29 30 bool Initialize(); 31 32 // Overridden from DiscardableMemory: 33 virtual DiscardableMemoryLockStatus Lock() OVERRIDE; 34 virtual void Unlock() OVERRIDE; 35 virtual void* Memory() const OVERRIDE; 36 37 // Overridden from internal::DiscardableMemoryManagerAllocation: 38 virtual bool AllocateAndAcquireLock() OVERRIDE; 39 virtual void ReleaseLock() OVERRIDE; 40 virtual void Purge() OVERRIDE; 41 42 private: 43 const size_t bytes_; 44 DiscardableMemoryAshmemAllocator* const allocator_; 45 DiscardableMemoryManager* const manager_; 46 bool is_locked_; 47 scoped_ptr<DiscardableAshmemChunk> ashmem_chunk_; 48 49 DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryAshmem); 50 }; 51 52 } // namespace internal 53 } // namespace base 54 55 #endif // BASE_MEMORY_DISCARDABLE_MEMORY_ASHMEM_H_ 56