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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 CHROME_BROWSER_CHROMEOS_MEMORY_LOW_MEMORY_OBSERVER_H_ | 5 #ifndef CHROME_BROWSER_MEMORY_LOW_MEMORY_OBSERVER_CHROMEOS_H_ |
6 #define CHROME_BROWSER_CHROMEOS_MEMORY_LOW_MEMORY_OBSERVER_H_ | 6 #define CHROME_BROWSER_MEMORY_LOW_MEMORY_OBSERVER_CHROMEOS_H_ |
7 | 7 |
8 #include "base/memory/ref_counted.h" | 8 #include "base/memory/ref_counted.h" |
9 | 9 |
10 namespace chromeos { | 10 namespace memory { |
11 | 11 |
12 class LowMemoryObserverImpl; | 12 class LowMemoryObserverImpl; |
13 | 13 |
14 //////////////////////////////////////////////////////////////////////////////// | 14 //////////////////////////////////////////////////////////////////////////////// |
15 // LowMemoryObserver | 15 // LowMemoryObserver |
16 // | 16 // |
17 // Class to handle observation of low memory device for changes so that we | 17 // Class to handle observation of low memory device for changes so that we |
18 // can get a signal from the kernel about low memory conditions and discard tabs | 18 // can get a signal from the kernel about low memory conditions and discard tabs |
19 // when that happens, instead of waiting for the OOM killer to kill renderers | 19 // when that happens, instead of waiting for the OOM killer to kill renderers |
20 // (which is more drastic, but still necessary and possible). | 20 // (which is more drastic, but still necessary and possible). |
21 // | 21 // |
22 // This object starts and stops the observation, and can be created or deleted | 22 // This object starts and stops the observation, and can be created or deleted |
23 // from any thread, but the observation occurs on the FILE thread, and tabs are | 23 // from any thread, but the observation occurs on the FILE thread, and tabs are |
24 // discarded on the UI thread. | 24 // discarded on the UI thread. |
25 class LowMemoryObserver { | 25 class LowMemoryObserver { |
26 public: | 26 public: |
27 LowMemoryObserver(); | 27 LowMemoryObserver(); |
28 ~LowMemoryObserver(); | 28 ~LowMemoryObserver(); |
29 | 29 |
30 void Start(); | 30 void Start(); |
31 void Stop(); | 31 void Stop(); |
32 | 32 |
33 private: | 33 private: |
34 scoped_refptr<LowMemoryObserverImpl> observer_; | 34 scoped_refptr<LowMemoryObserverImpl> observer_; |
35 | 35 |
36 DISALLOW_COPY_AND_ASSIGN(LowMemoryObserver); | 36 DISALLOW_COPY_AND_ASSIGN(LowMemoryObserver); |
37 }; | 37 }; |
38 | 38 |
39 } // namespace chromeos | 39 } // namespace memory |
40 | 40 |
41 #endif // CHROME_BROWSER_CHROMEOS_MEMORY_LOW_MEMORY_OBSERVER_H_ | 41 #endif // CHROME_BROWSER_MEMORY_LOW_MEMORY_OBSERVER_CHROMEOS_H_ |
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