1a2b83a17d
if system process ever restarted, processes using a SensorManager would loose the ability to use it, resulting to a crash. we now listen for sensor service death and reconnected if necessary. Bug: 5445240 Change-Id: Ia47f8b26cdcecb729fa22bf11d55e10fcaef8cfc
151 lines
4.2 KiB
C++
151 lines
4.2 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "Sensors"
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#include <stdint.h>
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#include <sys/types.h>
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#include <utils/Errors.h>
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#include <utils/RefBase.h>
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#include <utils/Singleton.h>
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#include <binder/IBinder.h>
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#include <binder/IServiceManager.h>
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#include <gui/ISensorServer.h>
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#include <gui/ISensorEventConnection.h>
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#include <gui/Sensor.h>
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#include <gui/SensorManager.h>
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#include <gui/SensorEventQueue.h>
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// ----------------------------------------------------------------------------
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namespace android {
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// ----------------------------------------------------------------------------
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ANDROID_SINGLETON_STATIC_INSTANCE(SensorManager)
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SensorManager::SensorManager()
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: mSensorList(0)
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{
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// okay we're not locked here, but it's not needed during construction
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assertStateLocked();
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}
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SensorManager::~SensorManager()
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{
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free(mSensorList);
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}
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void SensorManager::sensorManagerDied()
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{
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Mutex::Autolock _l(mLock);
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mSensorServer.clear();
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free(mSensorList);
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mSensorList = NULL;
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mSensors.clear();
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}
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status_t SensorManager::assertStateLocked() const {
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if (mSensorServer == NULL) {
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// try for one second
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const String16 name("sensorservice");
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for (int i=0 ; i<4 ; i++) {
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status_t err = getService(name, &mSensorServer);
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if (err == NAME_NOT_FOUND) {
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usleep(250000);
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continue;
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}
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if (err != NO_ERROR) {
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return err;
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}
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break;
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}
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class DeathObserver : public IBinder::DeathRecipient {
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SensorManager& mSensorManger;
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virtual void binderDied(const wp<IBinder>& who) {
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LOGW("sensorservice died [%p]", who.unsafe_get());
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mSensorManger.sensorManagerDied();
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}
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public:
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DeathObserver(SensorManager& mgr) : mSensorManger(mgr) { }
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};
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mDeathObserver = new DeathObserver(*const_cast<SensorManager *>(this));
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mSensorServer->asBinder()->linkToDeath(mDeathObserver);
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mSensors = mSensorServer->getSensorList();
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size_t count = mSensors.size();
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mSensorList = (Sensor const**)malloc(count * sizeof(Sensor*));
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for (size_t i=0 ; i<count ; i++) {
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mSensorList[i] = mSensors.array() + i;
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}
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}
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return NO_ERROR;
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}
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ssize_t SensorManager::getSensorList(Sensor const* const** list) const
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{
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Mutex::Autolock _l(mLock);
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status_t err = assertStateLocked();
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if (err < 0) {
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return ssize_t(err);
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}
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*list = mSensorList;
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return mSensors.size();
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}
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Sensor const* SensorManager::getDefaultSensor(int type)
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{
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Mutex::Autolock _l(mLock);
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if (assertStateLocked() == NO_ERROR) {
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// For now we just return the first sensor of that type we find.
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// in the future it will make sense to let the SensorService make
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// that decision.
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for (size_t i=0 ; i<mSensors.size() ; i++) {
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if (mSensorList[i]->getType() == type)
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return mSensorList[i];
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}
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}
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return NULL;
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}
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sp<SensorEventQueue> SensorManager::createEventQueue()
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{
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sp<SensorEventQueue> queue;
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Mutex::Autolock _l(mLock);
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while (assertStateLocked() == NO_ERROR) {
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sp<ISensorEventConnection> connection =
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mSensorServer->createSensorEventConnection();
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if (connection == NULL) {
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// SensorService just died.
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LOGE("createEventQueue: connection is NULL. SensorService died.");
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continue;
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}
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queue = new SensorEventQueue(connection);
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break;
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}
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return queue;
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}
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// ----------------------------------------------------------------------------
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}; // namespace android
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