base/memory/discardable_memory_mach.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_MACH_H_
   6 #define BASE_MEMORY_DISCARDABLE_MEMORY_MACH_H_
   7
   8 #include "base/memory/discardable_memory.h"
   9
  10 #include "base/mac/scoped_mach_vm.h"
  11 #include "base/memory/discardable_memory_manager.h"
  12
  13 namespace base {
  14 namespace internal {
  15
  16 class DiscardableMemoryMach
  17     : public DiscardableMemory,
  18       public internal::DiscardableMemoryManagerAllocation {
  19  public:
  20   explicit DiscardableMemoryMach(size_t bytes);
  21   ~DiscardableMemoryMach() override;
  22
  23   static void PurgeForTesting();
  24
  25   bool Initialize();
  26
  27   // Overridden from DiscardableMemory:
  28   DiscardableMemoryLockStatus Lock() override;
  29   void Unlock() override;
  30   void* Memory() const override;
  31
  32   // Overridden from internal::DiscardableMemoryManagerAllocation:
  33   bool AllocateAndAcquireLock() override;
  34   void ReleaseLock() override;
  35   void Purge() override;
  36   bool IsMemoryResident() const override;
  37
  38  private:
  39   mac::ScopedMachVM memory_;
  40   const size_t bytes_;
  41   bool is_locked_;
  42
  43   DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryMach);
  44 };
  45
  46 }  // namespace internal
  47 }  // namespace base
  48
  49 #endif  // BASE_MEMORY_DISCARDABLE_MEMORY_MACH_H_