base/memory/discardable_memory_emulated.h

   1 // Copyright 2013 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_EMULATED_H_
   6 #define BASE_MEMORY_DISCARDABLE_MEMORY_EMULATED_H_
   7
   8 #include "base/memory/discardable_memory.h"
   9
  10 namespace base {
  11 namespace internal {
  12
  13 class DiscardableMemoryEmulated : public DiscardableMemory {
  14  public:
  15   explicit DiscardableMemoryEmulated(size_t size);
  16   virtual ~DiscardableMemoryEmulated();
  17
  18   static void RegisterMemoryPressureListeners();
  19   static void UnregisterMemoryPressureListeners();
  20
  21   static void PurgeForTesting();
  22
  23   bool Initialize();
  24
  25   // Overridden from DiscardableMemory:
  26   virtual DiscardableMemoryLockStatus Lock() OVERRIDE;
  27   virtual void Unlock() OVERRIDE;
  28   virtual void* Memory() const OVERRIDE;
  29
  30  private:
  31   scoped_ptr<uint8, FreeDeleter> memory_;
  32   bool is_locked_;
  33
  34   DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryEmulated);
  35 };
  36
  37 }  // namespace internal
  38 }  // namespace base
  39
  40 #endif  // BASE_MEMORY_DISCARDABLE_MEMORY_EMULATED_H_