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// Copyright (c) 2011 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_GAMEPAD_PROVIDER_H_
#define CONTENT_BROWSER_GAMEPAD_PROVIDER_H_
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop_proxy.h"
#include "base/shared_memory.h"
#include "base/synchronization/lock.h"
#include "base/system_monitor/system_monitor.h"
#include "content/browser/gamepad/data_fetcher.h"
#include "content/common/content_export.h"
#include "content/common/gamepad_hardware_buffer.h"
namespace base {
class Thread;
}
struct GamepadMsg_Updated_Params;
namespace content {
class CONTENT_EXPORT GamepadProvider :
public base::RefCountedThreadSafe<GamepadProvider>,
public base::SystemMonitor::DevicesChangedObserver {
public:
explicit GamepadProvider(GamepadDataFetcher* fetcher);
base::SharedMemoryHandle GetRendererSharedMemoryHandle(
base::ProcessHandle renderer_process);
// Pause and resume the background polling thread. Can be called from any
// thread.
void Pause();
void Resume();
private:
friend class base::RefCountedThreadSafe<GamepadProvider>;
virtual ~GamepadProvider();
// Method for starting the polling, runs on polling_thread_.
void DoInitializePollingThread();
// Method for polling a GamepadDataFetcher. Runs on the polling_thread_.
void DoPoll();
void ScheduleDoPoll();
virtual void OnDevicesChanged() OVERRIDE;
GamepadHardwareBuffer* SharedMemoryAsHardwareBuffer();
enum { kDesiredSamplingIntervalMs = 16 };
// Keeps track of when the background thread is paused. Access to is_paused_
// must be guarded by is_paused_lock_.
base::Lock is_paused_lock_;
bool is_paused_;
// Updated based on notification from SystemMonitor when the system devices
// have been updated, and this notification is passed on to the data fetcher
// to enable it to avoid redundant (and possibly expensive) is-connected
// tests. Access to devices_changed_ must be guarded by
// devices_changed_lock_.
base::Lock devices_changed_lock_;
bool devices_changed_;
// The Message Loop on which this object was created.
// Typically the I/O loop, but may be something else during testing.
scoped_ptr<GamepadDataFetcher> provided_fetcher_;
// When polling_thread_ is running, members below are only to be used
// from that thread.
scoped_ptr<GamepadDataFetcher> data_fetcher_;
base::SharedMemory gamepad_shared_memory_;
// Polling is done on this background thread.
scoped_ptr<base::Thread> polling_thread_;
static GamepadProvider* instance_;
base::WeakPtrFactory<GamepadProvider> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(GamepadProvider);
};
} // namespace content
#endif // CONTENT_BROWSER_GAMEPAD_PROVIDER_H_
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