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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 | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef CHROME_BROWSER_CHROMEOS_MEMORY_LOW_MEMORY_OBSERVER_H_ | |
6 #define CHROME_BROWSER_CHROMEOS_MEMORY_LOW_MEMORY_OBSERVER_H_ | |
7 | |
8 #include "base/memory/ref_counted.h" | |
9 | |
10 namespace chromeos { | |
11 | |
12 class LowMemoryObserverImpl; | |
13 | |
14 //////////////////////////////////////////////////////////////////////////////// | |
15 // LowMemoryObserver | |
16 // | |
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 | |
19 // when that happens, instead of waiting for the OOM killer to kill renderers | |
20 // (which is more drastic, but still necessary and possible). | |
21 // | |
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 | |
24 // discarded on the UI thread. | |
25 class LowMemoryObserver { | |
26 public: | |
27 LowMemoryObserver(); | |
28 ~LowMemoryObserver(); | |
29 | |
30 void Start(); | |
31 void Stop(); | |
32 | |
33 private: | |
34 scoped_refptr<LowMemoryObserverImpl> observer_; | |
35 | |
36 DISALLOW_COPY_AND_ASSIGN(LowMemoryObserver); | |
37 }; | |
38 | |
39 } // namespace chromeos | |
40 | |
41 #endif // CHROME_BROWSER_CHROMEOS_MEMORY_LOW_MEMORY_OBSERVER_H_ | |
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