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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_MEMORY_DISCARDABLE_SHARED_MEMORY_H_ | 5 #ifndef BASE_MEMORY_DISCARDABLE_SHARED_MEMORY_H_ |
6 #define BASE_MEMORY_DISCARDABLE_SHARED_MEMORY_H_ | 6 #define BASE_MEMORY_DISCARDABLE_SHARED_MEMORY_H_ |
7 | 7 |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 | 9 |
10 #include "base/base_export.h" | 10 #include "base/base_export.h" |
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116 // Returns true if memory is still resident. | 116 // Returns true if memory is still resident. |
117 bool IsMemoryResident() const; | 117 bool IsMemoryResident() const; |
118 | 118 |
119 // Returns true if memory is locked. | 119 // Returns true if memory is locked. |
120 bool IsMemoryLocked() const; | 120 bool IsMemoryLocked() const; |
121 | 121 |
122 // Closes the open discardable memory segment. | 122 // Closes the open discardable memory segment. |
123 // It is safe to call Close repeatedly. | 123 // It is safe to call Close repeatedly. |
124 void Close(); | 124 void Close(); |
125 | 125 |
126 // Shares the discardable memory segment to another process. Attempts to | |
127 // create a platform-specific |new_handle| which can be used in a remote | |
128 // process to access the discardable memory segment. |new_handle| is an | |
129 // output parameter to receive the handle for use in the remote process. | |
130 // Returns true on success, false otherwise. | |
131 bool ShareToProcess(ProcessHandle process_handle, | |
132 SharedMemoryHandle* new_handle) { | |
133 return shared_memory_.ShareToProcess(process_handle, new_handle); | |
134 } | |
135 | |
136 private: | 126 private: |
137 // Virtual for tests. | 127 // Virtual for tests. |
138 virtual Time Now() const; | 128 virtual Time Now() const; |
139 | 129 |
140 SharedMemory shared_memory_; | 130 SharedMemory shared_memory_; |
141 size_t mapped_size_; | 131 size_t mapped_size_; |
142 size_t locked_page_count_; | 132 size_t locked_page_count_; |
143 #if DCHECK_IS_ON() | 133 #if DCHECK_IS_ON() |
144 std::set<size_t> locked_pages_; | 134 std::set<size_t> locked_pages_; |
145 #endif | 135 #endif |
146 // Implementation is not thread-safe but still usable if clients are | 136 // Implementation is not thread-safe but still usable if clients are |
147 // synchronized somehow. Use a collision warner to detect incorrect usage. | 137 // synchronized somehow. Use a collision warner to detect incorrect usage. |
148 DFAKE_MUTEX(thread_collision_warner_); | 138 DFAKE_MUTEX(thread_collision_warner_); |
149 Time last_known_usage_; | 139 Time last_known_usage_; |
150 | 140 |
151 DISALLOW_COPY_AND_ASSIGN(DiscardableSharedMemory); | 141 DISALLOW_COPY_AND_ASSIGN(DiscardableSharedMemory); |
152 }; | 142 }; |
153 | 143 |
154 } // namespace base | 144 } // namespace base |
155 | 145 |
156 #endif // BASE_MEMORY_DISCARDABLE_SHARED_MEMORY_H_ | 146 #endif // BASE_MEMORY_DISCARDABLE_SHARED_MEMORY_H_ |
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