base/memory/discardable_memory_shmem.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_SHMEM_H_
   6 #define BASE_MEMORY_DISCARDABLE_MEMORY_SHMEM_H_
   7
   8 #include "base/memory/discardable_memory.h"
   9
  10 namespace base {
  11 class DiscardableMemoryShmemChunk;
  12
  13 namespace internal {
  14
  15 class DiscardableMemoryShmem : public DiscardableMemory {
  16  public:
  17   explicit DiscardableMemoryShmem(size_t bytes);
  18   ~DiscardableMemoryShmem() override;
  19
  20   bool Initialize();
  21
  22   // Overridden from DiscardableMemory:
  23   DiscardableMemoryLockStatus Lock() override;
  24   void Unlock() override;
  25   void* Memory() const override;
  26
  27  private:
  28   const size_t bytes_;
  29   scoped_ptr<DiscardableMemoryShmemChunk> chunk_;
  30   bool is_locked_;
  31
  32   DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryShmem);
  33 };
  34
  35 }  // namespace internal
  36 }  // namespace base
  37
  38 #endif  // BASE_MEMORY_DISCARDABLE_MEMORY_SHMEM_H_