/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <sys/socket.h>
#include <utils/threads.h>
#include <sensor/SensorEventQueue.h>
#include "vec.h"
#include "SensorEventConnection.h"
#include "SensorDevice.h"
#define UNUSED(x) (void)(x)
namespace android {
SensorService::SensorEventConnection::SensorEventConnection(
const sp<SensorService>& service, uid_t uid, String8 packageName, bool isDataInjectionMode,
const String16& opPackageName)
: mService(service), mUid(uid), mWakeLockRefCount(0), mHasLooperCallbacks(false),
mDead(false), mDataInjectionMode(isDataInjectionMode), mEventCache(NULL),
mCacheSize(0), mMaxCacheSize(0), mPackageName(packageName), mOpPackageName(opPackageName) {
mChannel = new BitTube(mService->mSocketBufferSize);
#if DEBUG_CONNECTIONS
mEventsReceived = mEventsSentFromCache = mEventsSent = 0;
mTotalAcksNeeded = mTotalAcksReceived = 0;
#endif
}
SensorService::SensorEventConnection::~SensorEventConnection() {
ALOGD_IF(DEBUG_CONNECTIONS, "~SensorEventConnection(%p)", this);
mService->cleanupConnection(this);
if (mEventCache != NULL) {
delete mEventCache;
}
}
void SensorService::SensorEventConnection::onFirstRef() {
LooperCallback::onFirstRef();
}
bool SensorService::SensorEventConnection::needsWakeLock() {
Mutex::Autolock _l(mConnectionLock);
return !mDead && mWakeLockRefCount > 0;
}
void SensorService::SensorEventConnection::resetWakeLockRefCount() {
Mutex::Autolock _l(mConnectionLock);
mWakeLockRefCount = 0;
}
void SensorService::SensorEventConnection::dump(String8& result) {
Mutex::Autolock _l(mConnectionLock);
result.appendFormat("\tOperating Mode: %s\n",mDataInjectionMode ? "DATA_INJECTION" : "NORMAL");
result.appendFormat("\t %s | WakeLockRefCount %d | uid %d | cache size %d | "
"max cache size %d\n", mPackageName.string(), mWakeLockRefCount, mUid, mCacheSize,
mMaxCacheSize);
for (size_t i = 0; i < mSensorInfo.size(); ++i) {
const FlushInfo& flushInfo = mSensorInfo.valueAt(i);
result.appendFormat("\t %s 0x%08x | status: %s | pending flush events %d \n",
mService->getSensorName(mSensorInfo.keyAt(i)).string(),
mSensorInfo.keyAt(i),
flushInfo.mFirstFlushPending ? "First flush pending" :
"active",
flushInfo.mPendingFlushEventsToSend);
}
#if DEBUG_CONNECTIONS
result.appendFormat("\t events recvd: %d | sent %d | cache %d | dropped %d |"
" total_acks_needed %d | total_acks_recvd %d\n",
mEventsReceived,
mEventsSent,
mEventsSentFromCache,
mEventsReceived - (mEventsSentFromCache + mEventsSent + mCacheSize),
mTotalAcksNeeded,
mTotalAcksReceived);
#endif
}
bool SensorService::SensorEventConnection::addSensor(int32_t handle) {
Mutex::Autolock _l(mConnectionLock);
sp<SensorInterface> si = mService->getSensorInterfaceFromHandle(handle);
if (si == nullptr ||
!canAccessSensor(si->getSensor(), "Tried adding", mOpPackageName) ||
mSensorInfo.indexOfKey(handle) >= 0) {
return false;
}
mSensorInfo.add(handle, FlushInfo());
return true;
}
bool SensorService::SensorEventConnection::removeSensor(int32_t handle) {
Mutex::Autolock _l(mConnectionLock);
if (mSensorInfo.removeItem(handle) >= 0) {
return true;
}
return false;
}
bool SensorService::SensorEventConnection::hasSensor(int32_t handle) const {
Mutex::Autolock _l(mConnectionLock);
return mSensorInfo.indexOfKey(handle) >= 0;
}
bool SensorService::SensorEventConnection::hasAnySensor() const {
Mutex::Autolock _l(mConnectionLock);
return mSensorInfo.size() ? true : false;
}
bool SensorService::SensorEventConnection::hasOneShotSensors() const {
Mutex::Autolock _l(mConnectionLock);
for (size_t i = 0; i < mSensorInfo.size(); ++i) {
const int handle = mSensorInfo.keyAt(i);
sp<SensorInterface> si = mService->getSensorInterfaceFromHandle(handle);
if (si != nullptr && si->getSensor().getReportingMode() == AREPORTING_MODE_ONE_SHOT) {
return true;
}
}
return false;
}
String8 SensorService::SensorEventConnection::getPackageName() const {
return mPackageName;
}
void SensorService::SensorEventConnection::setFirstFlushPending(int32_t handle,
bool value) {
Mutex::Autolock _l(mConnectionLock);
ssize_t index = mSensorInfo.indexOfKey(handle);
if (index >= 0) {
FlushInfo& flushInfo = mSensorInfo.editValueAt(index);
flushInfo.mFirstFlushPending = value;
}
}
void SensorService::SensorEventConnection::updateLooperRegistration(const sp<Looper>& looper) {
Mutex::Autolock _l(mConnectionLock);
updateLooperRegistrationLocked(looper);
}
void SensorService::SensorEventConnection::updateLooperRegistrationLocked(
const sp<Looper>& looper) {
bool isConnectionActive = (mSensorInfo.size() > 0 && !mDataInjectionMode) ||
mDataInjectionMode;
// If all sensors are unregistered OR Looper has encountered an error, we can remove the Fd from
// the Looper if it has been previously added.
if (!isConnectionActive || mDead) { if (mHasLooperCallbacks) {
ALOGD_IF(DEBUG_CONNECTIONS, "%p removeFd fd=%d", this,
mChannel->getSendFd());
looper->removeFd(mChannel->getSendFd()); mHasLooperCallbacks = false; }
return; }
int looper_flags = 0;
if (mCacheSize > 0) looper_flags |= ALOOPER_EVENT_OUTPUT;
if (mDataInjectionMode) looper_flags |= ALOOPER_EVENT_INPUT;
for (size_t i = 0; i < mSensorInfo.size(); ++i) {
const int handle = mSensorInfo.keyAt(i);
sp<SensorInterface> si = mService->getSensorInterfaceFromHandle(handle);
if (si != nullptr && si->getSensor().isWakeUpSensor()) {
looper_flags |= ALOOPER_EVENT_INPUT;
}
}
// If flags is still set to zero, we don't need to add this fd to the Looper, if the fd has
// already been added, remove it. This is likely to happen when ALL the events stored in the
// cache have been sent to the corresponding app.
if (looper_flags == 0) {
if (mHasLooperCallbacks) {
ALOGD_IF(DEBUG_CONNECTIONS, "removeFd fd=%d", mChannel->getSendFd());
looper->removeFd(mChannel->getSendFd());
mHasLooperCallbacks = false;
}
return;
}
// Add the file descriptor to the Looper for receiving acknowledegments if the app has
// registered for wake-up sensors OR for sending events in the cache.
int ret = looper->addFd(mChannel->getSendFd(), 0, looper_flags, this, NULL);
if (ret == 1) {
ALOGD_IF(DEBUG_CONNECTIONS, "%p addFd fd=%d", this, mChannel->getSendFd());
mHasLooperCallbacks = true;
} else {
ALOGE("Looper::addFd failed ret=%d fd=%d", ret, mChannel->getSendFd());
}
}
void SensorService::SensorEventConnection::incrementPendingFlushCount(int32_t handle) {
Mutex::Autolock _l(mConnectionLock);
ssize_t index = mSensorInfo.indexOfKey(handle);
if (index >= 0) {
FlushInfo& flushInfo = mSensorInfo.editValueAt(index);
flushInfo.mPendingFlushEventsToSend++;
}
}
status_t SensorService::SensorEventConnection::sendEvents(
sensors_event_t const* buffer, size_t numEvents,
sensors_event_t* scratch,
wp<const SensorEventConnection> const * mapFlushEventsToConnections) {
// filter out events not for this connection
int count = 0;
Mutex::Autolock _l(mConnectionLock);
if (scratch) {
size_t i=0;
while (i<numEvents) {
int32_t sensor_handle = buffer[i].sensor;
if (buffer[i].type == SENSOR_TYPE_META_DATA) {
ALOGD_IF(DEBUG_CONNECTIONS, "flush complete event sensor==%d ",
buffer[i].meta_data.sensor);
// Setting sensor_handle to the correct sensor to ensure the sensor events per
// connection are filtered correctly. buffer[i].sensor is zero for meta_data
// events.
sensor_handle = buffer[i].meta_data.sensor;
}
ssize_t index = mSensorInfo.indexOfKey(sensor_handle);
// Check if this connection has registered for this sensor. If not continue to the
// next sensor_event.
if (index < 0) {
++i;
continue;
}
FlushInfo& flushInfo = mSensorInfo.editValueAt(index);
// Check if there is a pending flush_complete event for this sensor on this connection.
if (buffer[i].type == SENSOR_TYPE_META_DATA && flushInfo.mFirstFlushPending == true &&
mapFlushEventsToConnections[i] == this) {
flushInfo.mFirstFlushPending = false;
ALOGD_IF(DEBUG_CONNECTIONS, "First flush event for sensor==%d ",
buffer[i].meta_data.sensor);
++i;
continue;
}
// If there is a pending flush complete event for this sensor on this connection,
// ignore the event and proceed to the next.
if (flushInfo.mFirstFlushPending) {
++i;
continue;
}
do {
// Keep copying events into the scratch buffer as long as they are regular
// sensor_events are from the same sensor_handle OR they are flush_complete_events
// from the same sensor_handle AND the current connection is mapped to the
// corresponding flush_complete_event.
if (buffer[i].type == SENSOR_TYPE_META_DATA) {
if (mapFlushEventsToConnections[i] == this) {
scratch[count++] = buffer[i];
}
++i;
} else {
// Regular sensor event, just copy it to the scratch buffer.
scratch[count++] = buffer[i++];
}
} while ((i<numEvents) && ((buffer[i].sensor == sensor_handle &&
buffer[i].type != SENSOR_TYPE_META_DATA) ||
(buffer[i].type == SENSOR_TYPE_META_DATA &&
buffer[i].meta_data.sensor == sensor_handle)));
}
} else {
scratch = const_cast<sensors_event_t *>(buffer);
count = numEvents;
}
sendPendingFlushEventsLocked();
// Early return if there are no events for this connection.
if (count == 0) {
return status_t(NO_ERROR);
}
#if DEBUG_CONNECTIONS
mEventsReceived += count;
#endif
if (mCacheSize != 0) {
// There are some events in the cache which need to be sent first. Copy this buffer to
// the end of cache.
if (mCacheSize + count <= mMaxCacheSize) {
memcpy(&mEventCache[mCacheSize], scratch, count * sizeof(sensors_event_t));
mCacheSize += count;
} else {
// Check if any new sensors have registered on this connection which may have increased
// the max cache size that is desired.
if (mCacheSize + count < computeMaxCacheSizeLocked()) {
reAllocateCacheLocked(scratch, count);
return status_t(NO_ERROR);
}
// Some events need to be dropped.
int remaningCacheSize = mMaxCacheSize - mCacheSize;
if (remaningCacheSize != 0) {
memcpy(&mEventCache[mCacheSize], scratch,
remaningCacheSize * sizeof(sensors_event_t));
}
int numEventsDropped = count - remaningCacheSize;
countFlushCompleteEventsLocked(mEventCache, numEventsDropped);
// Drop the first "numEventsDropped" in the cache.
memmove(mEventCache, &mEventCache[numEventsDropped],
(mCacheSize - numEventsDropped) * sizeof(sensors_event_t));
// Copy the remainingEvents in scratch buffer to the end of cache.
memcpy(&mEventCache[mCacheSize - numEventsDropped], scratch + remaningCacheSize,
numEventsDropped * sizeof(sensors_event_t));
}
return status_t(NO_ERROR);
}
int index_wake_up_event = findWakeUpSensorEventLocked(scratch, count);
if (index_wake_up_event >= 0) {
scratch[index_wake_up_event].flags |= WAKE_UP_SENSOR_EVENT_NEEDS_ACK;
++mWakeLockRefCount;
#if DEBUG_CONNECTIONS
++mTotalAcksNeeded;
#endif
}
// NOTE: ASensorEvent and sensors_event_t are the same type.
ssize_t size = SensorEventQueue::write(mChannel,
reinterpret_cast<ASensorEvent const*>(scratch), count);
if (size < 0) {
// Write error, copy events to local cache.
if (index_wake_up_event >= 0) {
// If there was a wake_up sensor_event, reset the flag.
scratch[index_wake_up_event].flags &= ~WAKE_UP_SENSOR_EVENT_NEEDS_ACK;
if (mWakeLockRefCount > 0) {
--mWakeLockRefCount;
}
#if DEBUG_CONNECTIONS
--mTotalAcksNeeded;
#endif
}
if (mEventCache == NULL) {
mMaxCacheSize = computeMaxCacheSizeLocked();
mEventCache = new sensors_event_t[mMaxCacheSize];
mCacheSize = 0;
}
memcpy(&mEventCache[mCacheSize], scratch, count * sizeof(sensors_event_t));
mCacheSize += count;
// Add this file descriptor to the looper to get a callback when this fd is available for
// writing.
updateLooperRegistrationLocked(mService->getLooper());
return size;
}
#if DEBUG_CONNECTIONS
if (size > 0) {
mEventsSent += count;
}
#endif
return size < 0 ? status_t(size) : status_t(NO_ERROR);
}
void SensorService::SensorEventConnection::reAllocateCacheLocked(sensors_event_t const* scratch,
int count) {
sensors_event_t *eventCache_new;
const int new_cache_size = computeMaxCacheSizeLocked();
// Allocate new cache, copy over events from the old cache & scratch, free up memory.
eventCache_new = new sensors_event_t[new_cache_size];
memcpy(eventCache_new, mEventCache, mCacheSize * sizeof(sensors_event_t));
memcpy(&eventCache_new[mCacheSize], scratch, count * sizeof(sensors_event_t));
ALOGD_IF(DEBUG_CONNECTIONS, "reAllocateCacheLocked maxCacheSize=%d %d", mMaxCacheSize,
new_cache_size);
delete mEventCache;
mEventCache = eventCache_new;
mCacheSize += count;
mMaxCacheSize = new_cache_size;
}
void SensorService::SensorEventConnection::sendPendingFlushEventsLocked() {
ASensorEvent flushCompleteEvent;
memset(&flushCompleteEvent, 0, sizeof(flushCompleteEvent));
flushCompleteEvent.type = SENSOR_TYPE_META_DATA;
// Loop through all the sensors for this connection and check if there are any pending
// flush complete events to be sent.
for (size_t i = 0; i < mSensorInfo.size(); ++i) {
const int handle = mSensorInfo.keyAt(i);
sp<SensorInterface> si = mService->getSensorInterfaceFromHandle(handle);
if (si == nullptr) {
continue;
}
FlushInfo& flushInfo = mSensorInfo.editValueAt(i);
while (flushInfo.mPendingFlushEventsToSend > 0) {
flushCompleteEvent.meta_data.sensor = handle;
bool wakeUpSensor = si->getSensor().isWakeUpSensor();
if (wakeUpSensor) {
++mWakeLockRefCount;
flushCompleteEvent.flags |= WAKE_UP_SENSOR_EVENT_NEEDS_ACK;
}
ssize_t size = SensorEventQueue::write(mChannel, &flushCompleteEvent, 1);
if (size < 0) {
if (wakeUpSensor) --mWakeLockRefCount;
return;
}
ALOGD_IF(DEBUG_CONNECTIONS, "sent dropped flush complete event==%d ",
flushCompleteEvent.meta_data.sensor);
flushInfo.mPendingFlushEventsToSend--;
}
}
}
void SensorService::SensorEventConnection::writeToSocketFromCache() {
// At a time write at most half the size of the receiver buffer in SensorEventQueue OR
// half the size of the socket buffer allocated in BitTube whichever is smaller.
const int maxWriteSize = helpers::min(SensorEventQueue::MAX_RECEIVE_BUFFER_EVENT_COUNT/2,
int(mService->mSocketBufferSize/(sizeof(sensors_event_t)*2)));
Mutex::Autolock _l(mConnectionLock);
// Send pending flush complete events (if any)
sendPendingFlushEventsLocked();
for (int numEventsSent = 0; numEventsSent < mCacheSize;) {
const int numEventsToWrite = helpers::min(mCacheSize - numEventsSent, maxWriteSize);
int index_wake_up_event =
findWakeUpSensorEventLocked(mEventCache + numEventsSent, numEventsToWrite);
if (index_wake_up_event >= 0) {
mEventCache[index_wake_up_event + numEventsSent].flags |=
WAKE_UP_SENSOR_EVENT_NEEDS_ACK;
++mWakeLockRefCount;
#if DEBUG_CONNECTIONS
++mTotalAcksNeeded;
#endif
}
ssize_t size = SensorEventQueue::write(mChannel,
reinterpret_cast<ASensorEvent const*>(mEventCache + numEventsSent),
numEventsToWrite);
if (size < 0) {
if (index_wake_up_event >= 0) {
// If there was a wake_up sensor_event, reset the flag.
mEventCache[index_wake_up_event + numEventsSent].flags &=
~WAKE_UP_SENSOR_EVENT_NEEDS_ACK;
if (mWakeLockRefCount > 0) {
--mWakeLockRefCount;
}
#if DEBUG_CONNECTIONS
--mTotalAcksNeeded;
#endif
}
memmove(mEventCache, &mEventCache[numEventsSent],
(mCacheSize - numEventsSent) * sizeof(sensors_event_t));
ALOGD_IF(DEBUG_CONNECTIONS, "wrote %d events from cache size==%d ",
numEventsSent, mCacheSize);
mCacheSize -= numEventsSent;
return;
}
numEventsSent += numEventsToWrite;
#if DEBUG_CONNECTIONS
mEventsSentFromCache += numEventsToWrite;
#endif
}
ALOGD_IF(DEBUG_CONNECTIONS, "wrote all events from cache size=%d ", mCacheSize);
// All events from the cache have been sent. Reset cache size to zero.
mCacheSize = 0;
// There are no more events in the cache. We don't need to poll for write on the fd.
// Update Looper registration.
updateLooperRegistrationLocked(mService->getLooper());
}
void SensorService::SensorEventConnection::countFlushCompleteEventsLocked(
sensors_event_t const* scratch, const int numEventsDropped) {
ALOGD_IF(DEBUG_CONNECTIONS, "dropping %d events ", numEventsDropped);
// Count flushComplete events in the events that are about to the dropped. These will be sent
// separately before the next batch of events.
for (int j = 0; j < numEventsDropped; ++j) {
if (scratch[j].type == SENSOR_TYPE_META_DATA) {
FlushInfo& flushInfo = mSensorInfo.editValueFor(scratch[j].meta_data.sensor);
flushInfo.mPendingFlushEventsToSend++;
ALOGD_IF(DEBUG_CONNECTIONS, "increment pendingFlushCount %d",
flushInfo.mPendingFlushEventsToSend);
}
}
return;
}
int SensorService::SensorEventConnection::findWakeUpSensorEventLocked(
sensors_event_t const* scratch, const int count) {
for (int i = 0; i < count; ++i) {
if (mService->isWakeUpSensorEvent(scratch[i])) {
return i;
}
}
return -1;
}
sp<BitTube> SensorService::SensorEventConnection::getSensorChannel() const
{
return mChannel;
}
status_t SensorService::SensorEventConnection::enableDisable(
int handle, bool enabled, nsecs_t samplingPeriodNs, nsecs_t maxBatchReportLatencyNs,
int reservedFlags)
{
status_t err;
if (enabled) {
err = mService->enable(this, handle, samplingPeriodNs, maxBatchReportLatencyNs,
reservedFlags, mOpPackageName);
} else {
err = mService->disable(this, handle);
}
return err;
}
status_t SensorService::SensorEventConnection::setEventRate(
int handle, nsecs_t samplingPeriodNs)
{
return mService->setEventRate(this, handle, samplingPeriodNs, mOpPackageName);
}
status_t SensorService::SensorEventConnection::flush() {
return mService->flushSensor(this, mOpPackageName);
}
int32_t SensorService::SensorEventConnection::configureChannel(int handle, int rateLevel) {
// SensorEventConnection does not support configureChannel, parameters not used
UNUSED(handle);
UNUSED(rateLevel);
return INVALID_OPERATION;
}
int SensorService::SensorEventConnection::handleEvent(int fd, int events, void* /*data*/) {
if (events & ALOOPER_EVENT_HANGUP || events & ALOOPER_EVENT_ERROR) {
{
// If the Looper encounters some error, set the flag mDead, reset mWakeLockRefCount,
// and remove the fd from Looper. Call checkWakeLockState to know if SensorService
// can release the wake-lock.
ALOGD_IF(DEBUG_CONNECTIONS, "%p Looper error %d", this, fd);
Mutex::Autolock _l(mConnectionLock);
mDead = true;
mWakeLockRefCount = 0;
updateLooperRegistrationLocked(mService->getLooper());
}
mService->checkWakeLockState();
if (mDataInjectionMode) {
// If the Looper has encountered some error in data injection mode, reset SensorService
// back to normal mode.
mService->resetToNormalMode();
mDataInjectionMode = false;
}
return 1;
}
if (events & ALOOPER_EVENT_INPUT) {
unsigned char buf[sizeof(sensors_event_t)];
ssize_t numBytesRead = ::recv(fd, buf, sizeof(buf), MSG_DONTWAIT);
{
Mutex::Autolock _l(mConnectionLock);
if (numBytesRead == sizeof(sensors_event_t)) {
if (!mDataInjectionMode) {
ALOGE("Data injected in normal mode, dropping event"
"package=%s uid=%d", mPackageName.string(), mUid);
// Unregister call backs.
return 0;
}
sensors_event_t sensor_event;
memcpy(&sensor_event, buf, sizeof(sensors_event_t));
sp<SensorInterface> si =
mService->getSensorInterfaceFromHandle(sensor_event.sensor);
if (si == nullptr) {
return 1;
}
SensorDevice& dev(SensorDevice::getInstance());
sensor_event.type = si->getSensor().getType();
dev.injectSensorData(&sensor_event);
#if DEBUG_CONNECTIONS
++mEventsReceived;
#endif
} else if (numBytesRead == sizeof(uint32_t)) {
uint32_t numAcks = 0;
memcpy(&numAcks, buf, numBytesRead);
// Sanity check to ensure there are no read errors in recv, numAcks is always
// within the range and not zero. If any of the above don't hold reset
// mWakeLockRefCount to zero.
if (numAcks > 0 && numAcks < mWakeLockRefCount) {
mWakeLockRefCount -= numAcks;
} else {
mWakeLockRefCount = 0;
}
#if DEBUG_CONNECTIONS
mTotalAcksReceived += numAcks;
#endif
} else {
// Read error, reset wakelock refcount.
mWakeLockRefCount = 0;
}
}
// Check if wakelock can be released by sensorservice. mConnectionLock needs to be released
// here as checkWakeLockState() will need it.
if (mWakeLockRefCount == 0) {
mService->checkWakeLockState();
}
// continue getting callbacks.
return 1;
}
if (events & ALOOPER_EVENT_OUTPUT) {
// send sensor data that is stored in mEventCache for this connection.
mService->sendEventsFromCache(this);
}
return 1;
}
int SensorService::SensorEventConnection::computeMaxCacheSizeLocked() const {
size_t fifoWakeUpSensors = 0;
size_t fifoNonWakeUpSensors = 0;
for (size_t i = 0; i < mSensorInfo.size(); ++i) {
sp<SensorInterface> si = mService->getSensorInterfaceFromHandle(mSensorInfo.keyAt(i));
if (si == nullptr) {
continue;
}
const Sensor& sensor = si->getSensor();
if (sensor.getFifoReservedEventCount() == sensor.getFifoMaxEventCount()) {
// Each sensor has a reserved fifo. Sum up the fifo sizes for all wake up sensors and
// non wake_up sensors.
if (sensor.isWakeUpSensor()) {
fifoWakeUpSensors += sensor.getFifoReservedEventCount();
} else {
fifoNonWakeUpSensors += sensor.getFifoReservedEventCount();
}
} else {
// Shared fifo. Compute the max of the fifo sizes for wake_up and non_wake up sensors.
if (sensor.isWakeUpSensor()) {
fifoWakeUpSensors = fifoWakeUpSensors > sensor.getFifoMaxEventCount() ?
fifoWakeUpSensors : sensor.getFifoMaxEventCount();
} else {
fifoNonWakeUpSensors = fifoNonWakeUpSensors > sensor.getFifoMaxEventCount() ?
fifoNonWakeUpSensors : sensor.getFifoMaxEventCount();
}
}
}
if (fifoWakeUpSensors + fifoNonWakeUpSensors == 0) {
// It is extremely unlikely that there is a write failure in non batch mode. Return a cache
// size that is equal to that of the batch mode.
// ALOGW("Write failure in non-batch mode");
return MAX_SOCKET_BUFFER_SIZE_BATCHED/sizeof(sensors_event_t);
}
return fifoWakeUpSensors + fifoNonWakeUpSensors;
}
} // namespace android