| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_MEMORY_SHARED_MEMORY_TRACKER_H_ |
| #define BASE_MEMORY_SHARED_MEMORY_TRACKER_H_ |
| |
| #include <map> |
| #include <string> |
| |
| #include "base/memory/shared_memory.h" |
| #include "base/memory/shared_memory_mapping.h" |
| #include "base/synchronization/lock.h" |
| |
| namespace base { |
| |
| // SharedMemoryTracker tracks shared memory usage. |
| class BASE_EXPORT SharedMemoryTracker { |
| public: |
| // Returns a singleton instance. |
| static SharedMemoryTracker* GetInstance(); |
| |
| static std::string GetDumpNameForTracing(const UnguessableToken& id); |
| |
| // Records shared memory usage on valid mapping. |
| void IncrementMemoryUsage(const SharedMemory& shared_memory); |
| void IncrementMemoryUsage(const SharedMemoryMapping& mapping); |
| |
| // Records shared memory usage on unmapping. |
| void DecrementMemoryUsage(const SharedMemory& shared_memory); |
| void DecrementMemoryUsage(const SharedMemoryMapping& mapping); |
| |
| // Root dump name for all shared memory dumps. |
| static const char kDumpRootName[]; |
| |
| private: |
| SharedMemoryTracker(); |
| ~SharedMemoryTracker(); |
| |
| // Information associated with each mapped address. |
| struct UsageInfo { |
| UsageInfo(size_t size, const UnguessableToken& id) |
| : mapped_size(size), mapped_id(id) {} |
| |
| size_t mapped_size; |
| UnguessableToken mapped_id; |
| }; |
| |
| // Used to lock when |usages_| is modified or read. |
| Lock usages_lock_; |
| std::map<void*, UsageInfo> usages_; |
| |
| DISALLOW_COPY_AND_ASSIGN(SharedMemoryTracker); |
| }; |
| |
| } // namespace base |
| |
| #endif // BASE_MEMORY_SHARED_MEMORY_TRACKER_H_ |