Upstream version 11.40.271.0
[platform/framework/web/crosswalk.git] / src / 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_