base/memory/discardable_memory_ashmem.h

   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_