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1 // Copyright (c) 2013 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 CONTENT_BROWSER_DEVICE_ORIENTATION_DEVICE_MOTION_SERVICE_H_ | |
6 #define CONTENT_BROWSER_DEVICE_ORIENTATION_DEVICE_MOTION_SERVICE_H_ | |
7 | |
8 #include "base/basictypes.h" | |
9 #include "base/callback_forward.h" | |
10 #include "base/memory/scoped_ptr.h" | |
11 #include "base/memory/singleton.h" | |
12 #include "base/shared_memory.h" | |
13 #include "base/threading/thread_checker.h" | |
14 #include "content/common/content_export.h" | |
15 | |
16 namespace content { | |
17 | |
18 class DataFetcherSharedMemory; | |
19 class DeviceMotionProvider; | |
20 class RenderProcessHost; | |
21 | |
22 // Owns the DeviceMotionProvider (the background polling thread) and keeps | |
23 // track of the number of consumers currently using the data (and pausing | |
24 // the provider when not in use). | |
25 class CONTENT_EXPORT DeviceMotionService { | |
26 public: | |
27 // Returns the DeviceMotionService singleton. | |
28 static DeviceMotionService* GetInstance(); | |
29 | |
30 // Increments the number of users of the provider. The Provider is running | |
31 // when there's > 0 users, and is paused when the count drops to 0. | |
32 // | |
33 // Must be called on the I/O thread. | |
34 void AddConsumer(); | |
35 | |
36 // Removes a consumer. Should be matched with an AddConsumer call. | |
37 // | |
38 // Must be called on the I/O thread. | |
39 void RemoveConsumer(); | |
40 | |
41 // Returns the shared memory handle of the device motion data duplicated | |
42 // into the given process. | |
43 base::SharedMemoryHandle GetSharedMemoryHandleForProcess( | |
44 base::ProcessHandle handle); | |
45 | |
46 // Stop/join with the background thread in DeviceMotionProvider |provider_|. | |
47 void Terminate(); | |
darin (slow to review)
2013/06/27 17:33:26
I'm trying to understand this method. It looks li
timvolodine
2013/06/27 21:08:43
This method comes from a similar class for gamepad
| |
48 | |
49 private: | |
50 friend struct DefaultSingletonTraits<DeviceMotionService>; | |
51 | |
52 DeviceMotionService(); | |
53 virtual ~DeviceMotionService(); | |
54 | |
55 int num_readers_; | |
56 scoped_ptr<DeviceMotionProvider> provider_; | |
57 base::ThreadChecker thread_checker_; | |
58 | |
59 DISALLOW_COPY_AND_ASSIGN(DeviceMotionService); | |
60 }; | |
61 | |
62 } // namespace content | |
63 | |
64 #endif // CONTENT_BROWSER_DEVICE_ORIENTATION_DEVICE_MOTION_SERVICE_H_ | |
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