diff options
Diffstat (limited to 'services/sensorservice/SensorService.h')
| -rw-r--r-- | services/sensorservice/SensorService.h | 122 |
1 files changed, 110 insertions, 12 deletions
diff --git a/services/sensorservice/SensorService.h b/services/sensorservice/SensorService.h index e88ffc8..5e3eeb5 100644 --- a/services/sensorservice/SensorService.h +++ b/services/sensorservice/SensorService.h @@ -24,7 +24,9 @@ #include <utils/SortedVector.h> #include <utils/KeyedVector.h> #include <utils/threads.h> +#include <utils/AndroidThreads.h> #include <utils/RefBase.h> +#include <utils/Looper.h> #include <binder/BinderService.h> @@ -38,8 +40,9 @@ // --------------------------------------------------------------------------- #define DEBUG_CONNECTIONS false -// Max size is 1 MB which is enough to accept a batch of about 10k events. -#define MAX_SOCKET_BUFFER_SIZE_BATCHED 1024 * 1024 +// Max size is 100 KB which is enough to accept a batch of about 1000 events. +#define MAX_SOCKET_BUFFER_SIZE_BATCHED 100 * 1024 +// For older HALs which don't support batching, use a smaller socket buffer size. #define SOCKET_BUFFER_SIZE_NON_BATCHED 4 * 1024 struct sensors_poll_device_t; @@ -71,8 +74,8 @@ class SensorService : virtual sp<ISensorEventConnection> createSensorEventConnection(); virtual status_t dump(int fd, const Vector<String16>& args); - - class SensorEventConnection : public BnSensorEventConnection { + class SensorEventConnection : public BnSensorEventConnection, public LooperCallback { + friend class SensorService; virtual ~SensorEventConnection(); virtual void onFirstRef(); virtual sp<BitTube> getSensorChannel() const; @@ -83,13 +86,69 @@ class SensorService : // Count the number of flush complete events which are about to be dropped in the buffer. // Increment mPendingFlushEventsToSend in mSensorInfo. These flush complete events will be // sent separately before the next batch of events. - void countFlushCompleteEventsLocked(sensors_event_t* scratch, int numEventsDropped); + void countFlushCompleteEventsLocked(sensors_event_t const* scratch, int numEventsDropped); + + // Check if there are any wake up events in the buffer. If yes, return the index of the + // first wake_up sensor event in the buffer else return -1. This wake_up sensor event will + // have the flag WAKE_UP_SENSOR_EVENT_NEEDS_ACK set. Exactly one event per packet will have + // the wake_up flag set. SOCK_SEQPACKET ensures that either the entire packet is read or + // dropped. + int findWakeUpSensorEventLocked(sensors_event_t const* scratch, int count); + + // Send pending flush_complete events. There may have been flush_complete_events that are + // dropped which need to be sent separately before other events. On older HALs (1_0) this + // method emulates the behavior of flush(). + void sendPendingFlushEventsLocked(); + + // Writes events from mEventCache to the socket. + void writeToSocketFromCacheLocked(); + + // Compute the approximate cache size from the FIFO sizes of various sensors registered for + // this connection. Wake up and non-wake up sensors have separate FIFOs but FIFO may be + // shared amongst wake-up sensors and non-wake up sensors. + int computeMaxCacheSizeLocked() const; + + // When more sensors register, the maximum cache size desired may change. Compute max cache + // size, reallocate memory and copy over events from the older cache. + void reAllocateCacheLocked(sensors_event_t const* scratch, int count); + + // LooperCallback method. If there is data to read on this fd, it is an ack from the + // app that it has read events from a wake up sensor, decrement mWakeLockRefCount. + // If this fd is available for writing send the data from the cache. + virtual int handleEvent(int fd, int events, void* data); + + // Increment mPendingFlushEventsToSend for the given sensor handle. + void incrementPendingFlushCount(int32_t handle); + + // Add or remove the file descriptor associated with the BitTube to the looper. If mDead is + // set to true or there are no more sensors for this connection, the file descriptor is + // removed if it has been previously added to the Looper. Depending on the state of the + // connection FD may be added to the Looper. The flags to set are determined by the internal + // state of the connection. FDs are added to the looper when wake-up sensors are registered + // (to poll for acknowledgements) and when write fails on the socket when there are too many + // events (to poll when the FD is available for writing). FDs are removed when there is an + // error and the other end hangs up or when this client unregisters for this connection. + void updateLooperRegistration(const sp<Looper>& looper); + void updateLooperRegistrationLocked(const sp<Looper>& looper); sp<SensorService> const mService; sp<BitTube> mChannel; uid_t mUid; mutable Mutex mConnectionLock; + // Number of events from wake up sensors which are still pending and haven't been delivered + // to the corresponding application. It is incremented by one unit for each write to the + // socket. + uint32_t mWakeLockRefCount; + // If this flag is set to true, it means that the file descriptor associated with the + // BitTube has been added to the Looper in SensorService. This flag is typically set when + // this connection has wake-up sensors associated with it or when write has failed on this + // connection and we're storing some events in the cache. + bool mHasLooperCallbacks; + // If there are any errors associated with the Looper this flag is set to true and + // mWakeLockRefCount is reset to zero. needsWakeLock method will always return false, if + // this flag is set. + bool mDead; struct FlushInfo { // The number of flush complete events dropped for this sensor is stored here. // They are sent separately before the next batch of events. @@ -101,38 +160,60 @@ class SensorService : }; // protected by SensorService::mLock. Key for this vector is the sensor handle. KeyedVector<int, FlushInfo> mSensorInfo; + sensors_event_t *mEventCache; + int mCacheSize, mMaxCacheSize; + +#if DEBUG_CONNECTIONS + int mEventsReceived, mEventsSent, mEventsSentFromCache; + int mTotalAcksNeeded, mTotalAcksReceived; +#endif public: SensorEventConnection(const sp<SensorService>& service, uid_t uid); status_t sendEvents(sensors_event_t const* buffer, size_t count, - sensors_event_t* scratch = NULL); + sensors_event_t* scratch, + SensorEventConnection const * const * mapFlushEventsToConnections = NULL); bool hasSensor(int32_t handle) const; bool hasAnySensor() const; + bool hasOneShotSensors() const; bool addSensor(int32_t handle); bool removeSensor(int32_t handle); void setFirstFlushPending(int32_t handle, bool value); void dump(String8& result); + bool needsWakeLock(); uid_t getUid() const { return mUid; } }; class SensorRecord { SortedVector< wp<SensorEventConnection> > mConnections; + // A queue of all flush() calls made on this sensor. Flush complete events will be + // sent in this order. + Vector< wp<SensorEventConnection> > mPendingFlushConnections; public: SensorRecord(const sp<SensorEventConnection>& connection); bool addConnection(const sp<SensorEventConnection>& connection); bool removeConnection(const wp<SensorEventConnection>& connection); size_t getNumConnections() const { return mConnections.size(); } + + void addPendingFlushConnection(const sp<SensorEventConnection>& connection); + void removeFirstPendingFlushConnection(); + SensorEventConnection * getFirstPendingFlushConnection(); }; - SortedVector< wp<SensorEventConnection> > getActiveConnections() const; - DefaultKeyedVector<int, SensorInterface*> getActiveVirtualSensors() const; + class SensorEventAckReceiver : public Thread { + sp<SensorService> const mService; + public: + virtual bool threadLoop(); + SensorEventAckReceiver(const sp<SensorService>& service): mService(service) {} + }; String8 getSensorName(int handle) const; bool isVirtualSensor(int handle) const; Sensor getSensorFromHandle(int handle) const; - void recordLastValue(const sensors_event_t* buffer, size_t count); + bool isWakeUpSensor(int type) const; + void recordLastValueLocked(sensors_event_t const* buffer, size_t count); static void sortEventBuffer(sensors_event_t* buffer, size_t count); Sensor registerSensor(SensorInterface* sensor); Sensor registerVirtualSensor(SensorInterface* sensor); @@ -140,10 +221,21 @@ class SensorService : const sp<SensorEventConnection>& connection, int handle); status_t cleanupWithoutDisableLocked( const sp<SensorEventConnection>& connection, int handle); - void cleanupAutoDisabledSensor(const sp<SensorEventConnection>& connection, + void cleanupAutoDisabledSensorLocked(const sp<SensorEventConnection>& connection, sensors_event_t const* buffer, const int count); static bool canAccessSensor(const Sensor& sensor); static bool verifyCanAccessSensor(const Sensor& sensor, const char* operation); + // SensorService acquires a partial wakelock for delivering events from wake up sensors. This + // method checks whether all the events from these wake up sensors have been delivered to the + // corresponding applications, if yes the wakelock is released. + void checkWakeLockState(); + void checkWakeLockStateLocked(); + bool isWakeUpSensorEvent(const sensors_event_t& event) const; + + SensorRecord * getSensorRecord(int handle); + + sp<Looper> getLooper() const; + // constants Vector<Sensor> mSensorList; Vector<Sensor> mUserSensorListDebug; @@ -151,13 +243,19 @@ class SensorService : DefaultKeyedVector<int, SensorInterface*> mSensorMap; Vector<SensorInterface *> mVirtualSensorList; status_t mInitCheck; - size_t mSocketBufferSize; + // Socket buffersize used to initialize BitTube. This size depends on whether batching is + // supported or not. + uint32_t mSocketBufferSize; + sp<Looper> mLooper; // protected by mLock mutable Mutex mLock; DefaultKeyedVector<int, SensorRecord*> mActiveSensors; DefaultKeyedVector<int, SensorInterface*> mActiveVirtualSensors; SortedVector< wp<SensorEventConnection> > mActiveConnections; + bool mWakeLockAcquired; + sensors_event_t *mSensorEventBuffer, *mSensorEventScratch; + SensorEventConnection const **mMapFlushEventsToConnections; // The size of this vector is constant, only the items are mutable KeyedVector<int32_t, sensors_event_t> mLastEventSeen; @@ -168,7 +266,7 @@ public: nsecs_t samplingPeriodNs, nsecs_t maxBatchReportLatencyNs, int reservedFlags); status_t disable(const sp<SensorEventConnection>& connection, int handle); status_t setEventRate(const sp<SensorEventConnection>& connection, int handle, nsecs_t ns); - status_t flushSensor(const sp<SensorEventConnection>& connection, int handle); + status_t flushSensor(const sp<SensorEventConnection>& connection); }; // --------------------------------------------------------------------------- |