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.
5 #ifndef BASE_MEMORY_DISCARDABLE_MEMORY_SHMEM_H_
6 #define BASE_MEMORY_DISCARDABLE_MEMORY_SHMEM_H_
8 #include "base/memory/discardable_memory.h"
10 #include "base/memory/discardable_memory_manager.h"
13 class DiscardableSharedMemory;
17 class DiscardableMemoryShmem
18 : public DiscardableMemory,
19 public internal::DiscardableMemoryManagerAllocation {
21 explicit DiscardableMemoryShmem(size_t bytes);
22 virtual ~DiscardableMemoryShmem();
24 static void ReleaseFreeMemory();
26 static void PurgeForTesting();
30 // Overridden from DiscardableMemory:
31 virtual DiscardableMemoryLockStatus Lock() override;
32 virtual void Unlock() override;
33 virtual void* Memory() const override;
35 // Overridden from internal::DiscardableMemoryManagerAllocation:
36 virtual bool AllocateAndAcquireLock() override;
37 virtual void ReleaseLock() override;
38 virtual void Purge() override;
39 virtual bool IsMemoryResident() const override;
43 scoped_ptr<DiscardableSharedMemory> shared_memory_;
46 DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryShmem);
49 } // namespace internal
52 #endif // BASE_MEMORY_DISCARDABLE_MEMORY_SHMEM_H_