Index: content/browser/device_orientation/device_motion_service.h |
diff --git a/content/browser/device_orientation/device_motion_service.h b/content/browser/device_orientation/device_motion_service.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..832152d21d4fcfdab343b8f37010915f5968815e |
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+++ b/content/browser/device_orientation/device_motion_service.h |
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+// Copyright (c) 2013 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 CONTENT_BROWSER_DEVICE_ORIENTATION_DEVICE_MOTION_SERVICE_H_ |
+#define CONTENT_BROWSER_DEVICE_ORIENTATION_DEVICE_MOTION_SERVICE_H_ |
+ |
+#include "base/basictypes.h" |
+#include "base/callback_forward.h" |
+#include "base/memory/scoped_ptr.h" |
+#include "base/memory/singleton.h" |
+#include "base/shared_memory.h" |
+#include "base/threading/thread_checker.h" |
+#include "content/common/content_export.h" |
+ |
+namespace content { |
+ |
+class DataFetcherSharedMemory; |
+class DeviceMotionProvider; |
+class RenderProcessHost; |
+ |
+// Owns the DeviceMotionProvider (the background polling thread) and keeps |
+// track of the number of consumers currently using the data (and pausing |
+// the provider when not in use). |
+class CONTENT_EXPORT DeviceMotionService { |
+ public: |
+ // Returns the DeviceMotionService singleton. |
+ static DeviceMotionService* GetInstance(); |
+ |
+ // Increments the number of users of the provider. The Provider is running |
+ // when there's > 0 users, and is paused when the count drops to 0. |
+ // |
+ // Must be called on the I/O thread. |
+ void AddConsumer(); |
+ |
+ // Removes a consumer. Should be matched with an AddConsumer call. |
+ // |
+ // Must be called on the I/O thread. |
+ void RemoveConsumer(); |
+ |
+ // Returns the shared memory handle of the device motion data duplicated |
+ // into the given process. |
+ base::SharedMemoryHandle GetSharedMemoryHandleForProcess( |
+ base::ProcessHandle handle); |
+ |
+ // Stop/join with the background thread in DeviceMotionProvider |provider_|. |
+ void Shutdown(); |
+ |
+ private: |
+ friend struct DefaultSingletonTraits<DeviceMotionService>; |
+ |
+ DeviceMotionService(); |
+ virtual ~DeviceMotionService(); |
+ |
+ int num_readers_; |
+ bool is_shutdown_; |
+ scoped_ptr<DeviceMotionProvider> provider_; |
+ base::ThreadChecker thread_checker_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(DeviceMotionService); |
+}; |
+ |
+} // namespace content |
+ |
+#endif // CONTENT_BROWSER_DEVICE_ORIENTATION_DEVICE_MOTION_SERVICE_H_ |