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   ~DiscardableMemoryAshmem() override;
  29
  30   bool Initialize();
  31
  32   // Overridden from DiscardableMemory:
  33   DiscardableMemoryLockStatus Lock() override;
  34   void Unlock() override;
  35   void* Memory() const override;
  36
  37   // Overridden from internal::DiscardableMemoryManagerAllocation:
  38   bool AllocateAndAcquireLock() override;
  39   void ReleaseLock() override;
  40   void Purge() override;
  41   bool IsMemoryResident() const override;
  42
  43  private:
  44   const size_t bytes_;
  45   DiscardableMemoryAshmemAllocator* const allocator_;
  46   DiscardableMemoryManager* const manager_;
  47   bool is_locked_;
  48   scoped_ptr<DiscardableAshmemChunk> ashmem_chunk_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryAshmem);
  51 };
  52
  53 }  // namespace internal
  54 }  // namespace base
  55
  56 #endif  // BASE_MEMORY_DISCARDABLE_MEMORY_ASHMEM_H_