| // Copyright 2016 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. |
| |
| #include "device/generic_sensor/platform_sensor_provider_linux.h" |
| |
| #include "base/memory/singleton.h" |
| #include "base/task_runner_util.h" |
| #include "base/threading/thread.h" |
| #include "device/generic_sensor/linux/platform_sensor_utils_linux.h" |
| #include "device/generic_sensor/linux/sensor_data_linux.h" |
| #include "device/generic_sensor/platform_sensor_linux.h" |
| |
| namespace device { |
| |
| // static |
| PlatformSensorProviderLinux* PlatformSensorProviderLinux::GetInstance() { |
| return base::Singleton< |
| PlatformSensorProviderLinux, |
| base::LeakySingletonTraits<PlatformSensorProviderLinux>>::get(); |
| } |
| |
| PlatformSensorProviderLinux::PlatformSensorProviderLinux() = default; |
| |
| PlatformSensorProviderLinux::~PlatformSensorProviderLinux() = default; |
| |
| void PlatformSensorProviderLinux::CreateSensorInternal( |
| mojom::SensorType type, |
| mojo::ScopedSharedBufferMapping mapping, |
| const CreateSensorCallback& callback) { |
| SensorDataLinux data; |
| if (!InitSensorData(type, &data)) { |
| callback.Run(nullptr); |
| return; |
| } |
| |
| if (!polling_thread_) |
| polling_thread_.reset(new base::Thread("Sensor polling thread")); |
| |
| if (!polling_thread_->IsRunning()) { |
| if (!polling_thread_->StartWithOptions( |
| base::Thread::Options(base::MessageLoop::TYPE_IO, 0))) { |
| callback.Run(nullptr); |
| return; |
| } |
| polling_thread_task_runner_ = polling_thread_->task_runner(); |
| } |
| |
| base::PostTaskAndReplyWithResult( |
| polling_thread_task_runner_.get(), FROM_HERE, |
| base::Bind(SensorReader::Create, data), |
| base::Bind(&PlatformSensorProviderLinux::SensorReaderFound, |
| base::Unretained(this), type, base::Passed(&mapping), callback, |
| data)); |
| } |
| |
| void PlatformSensorProviderLinux::SensorReaderFound( |
| mojom::SensorType type, |
| mojo::ScopedSharedBufferMapping mapping, |
| const PlatformSensorProviderBase::CreateSensorCallback& callback, |
| const SensorDataLinux& data, |
| std::unique_ptr<SensorReader> sensor_reader) { |
| DCHECK(CalledOnValidThread()); |
| |
| if (!sensor_reader) { |
| // If there are no sensors, stop polling thread. |
| if (!HasSensors()) |
| AllSensorsRemoved(); |
| callback.Run(nullptr); |
| return; |
| } |
| |
| callback.Run(new PlatformSensorLinux(type, std::move(mapping), this, data, |
| std::move(sensor_reader), |
| polling_thread_task_runner_)); |
| } |
| |
| void PlatformSensorProviderLinux::SetFileTaskRunner( |
| scoped_refptr<base::SingleThreadTaskRunner> file_task_runner) { |
| DCHECK(CalledOnValidThread()); |
| if (!file_task_runner_) |
| file_task_runner_ = file_task_runner; |
| } |
| |
| void PlatformSensorProviderLinux::AllSensorsRemoved() { |
| DCHECK(CalledOnValidThread()); |
| DCHECK(file_task_runner_); |
| // When there are no sensors left, the polling thread must be stopped. |
| // Stop() can only be called on a different thread that allows io. |
| // Thus, browser's file thread is used for this purpose. |
| file_task_runner_->PostTask( |
| FROM_HERE, base::Bind(&PlatformSensorProviderLinux::StopPollingThread, |
| base::Unretained(this))); |
| } |
| |
| void PlatformSensorProviderLinux::StopPollingThread() { |
| DCHECK(file_task_runner_); |
| DCHECK(file_task_runner_->BelongsToCurrentThread()); |
| polling_thread_->Stop(); |
| } |
| |
| } // namespace device |