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1 // Copyright 2017 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_SHARED_MEMORY_TRACKER_H_ | |
6 #define BASE_MEMORY_SHARED_MEMORY_TRACKER_H_ | |
7 | |
8 #include "base/atomicops.h" | |
danakj
2017/02/24 15:30:28
unused?
hajimehoshi
2017/02/27 07:51:54
Done.
| |
9 #include "base/memory/shared_memory_handle.h" | |
danakj
2017/02/24 15:30:28
unused?
hajimehoshi
2017/02/27 07:51:54
Done.
| |
10 #include "base/memory/singleton.h" | |
11 #include "base/trace_event/memory_dump_provider.h" | |
12 | |
13 namespace base { | |
14 | |
15 class SharedMemory; | |
16 | |
17 namespace trace_event { | |
18 class ProcessMemoryDump; | |
19 } | |
20 | |
21 // SharedMemoryTracker tracks shared memory usage. | |
22 class BASE_EXPORT SharedMemoryTracker | |
23 : public base::trace_event::MemoryDumpProvider { | |
24 public: | |
25 // Returns a singleton instance. | |
26 static SharedMemoryTracker* GetInstance(); | |
27 | |
28 // base::trace_event::MemoryDumpProvider implementation. | |
29 bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args, | |
danakj
2017/02/24 15:30:28
nit: This could be private?
hajimehoshi
2017/02/27 07:51:54
Done.
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30 base::trace_event::ProcessMemoryDump* pmd) override; | |
31 | |
32 // Records shared memory usage on mapping. | |
33 void IncrementMemoryUsage(const SharedMemory& shared_memory); | |
34 | |
35 // Records shared memory usage on unmapping. | |
36 void DecrementMemoryUsage(const SharedMemory& shared_memory); | |
37 | |
38 private: | |
39 friend struct base::DefaultSingletonTraits<SharedMemoryTracker>; | |
40 | |
41 base::Lock lock_; | |
danakj
2017/02/24 15:30:28
include lock.h
hajimehoshi
2017/02/27 07:51:54
Done.
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42 std::unordered_map<const SharedMemory*, size_t> usages_; | |
43 | |
44 SharedMemoryTracker(); | |
45 ~SharedMemoryTracker() override; | |
46 | |
47 DISALLOW_COPY_AND_ASSIGN(SharedMemoryTracker); | |
48 }; | |
49 | |
50 } // namespace base | |
51 | |
52 #endif // BASE_MEMORY_SHARED_MEMORY_TRACKER_H_ | |
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