diff options
author | Mike Lockwood <lockwood@android.com> | 2010-04-07 16:32:51 -0400 |
---|---|---|
committer | Mike Lockwood <lockwood@android.com> | 2010-04-14 15:18:09 -0400 |
commit | 98e48691f738680fe59e7383a41458e7337daccd (patch) | |
tree | b7a719ec6293760f78f2d6f54a5229975493fa5e /services | |
parent | 8f5a800116f700b0af21d2a8468165bcf51b841c (diff) | |
download | frameworks_base-98e48691f738680fe59e7383a41458e7337daccd.zip frameworks_base-98e48691f738680fe59e7383a41458e7337daccd.tar.gz frameworks_base-98e48691f738680fe59e7383a41458e7337daccd.tar.bz2 |
GpsLocationProvider: optimize wake lock usage.
Rather than holding a wake lock the entire time the GPS is active, we now
hold it only when messages are pending for GpsLocationProvider's Handler
and rely on the lower level implementation holding a wake lock when calling
into the provider.
Signed-off-by: Mike Lockwood <lockwood@android.com>
Diffstat (limited to 'services')
-rwxr-xr-x | services/java/com/android/server/location/GpsLocationProvider.java | 105 |
1 files changed, 57 insertions, 48 deletions
diff --git a/services/java/com/android/server/location/GpsLocationProvider.java b/services/java/com/android/server/location/GpsLocationProvider.java index daa198f..742ee26 100755 --- a/services/java/com/android/server/location/GpsLocationProvider.java +++ b/services/java/com/android/server/location/GpsLocationProvider.java @@ -222,6 +222,12 @@ public class GpsLocationProvider implements LocationProviderInterface { // Wakelocks private final static String WAKELOCK_KEY = "GpsLocationProvider"; private final PowerManager.WakeLock mWakeLock; + // bitfield of pending messages to our Handler + // used only for messages that cannot have multiple instances queued + private int mPendingMessageBits; + // separate counter for ADD_LISTENER and REMOVE_LISTENER messages, + // which might have multiple instances queued + private int mPendingListenerMessages; // Alarms private final static String ALARM_WAKEUP = "com.android.internal.location.ALARM_WAKEUP"; @@ -323,6 +329,7 @@ public class GpsLocationProvider implements LocationProviderInterface { // Create a wake lock PowerManager powerManager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE); mWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, WAKELOCK_KEY); + mWakeLock.setReferenceCounted(false); mAlarmManager = (AlarmManager)mContext.getSystemService(Context.ALARM_SERVICE); mWakeupIntent = PendingIntent.getBroadcast(mContext, 0, new Intent(ALARM_WAKEUP), 0); @@ -401,11 +408,7 @@ public class GpsLocationProvider implements LocationProviderInterface { } public void updateNetworkState(int state, NetworkInfo info) { - mHandler.removeMessages(UPDATE_NETWORK_STATE); - Message m = Message.obtain(mHandler, UPDATE_NETWORK_STATE); - m.arg1 = state; - m.obj = info; - mHandler.sendMessage(m); + sendMessage(UPDATE_NETWORK_STATE, state, info); } private void handleUpdateNetworkState(int state, NetworkInfo info) { @@ -434,12 +437,10 @@ public class GpsLocationProvider implements LocationProviderInterface { if (mNetworkAvailable) { if (mInjectNtpTimePending) { - mHandler.removeMessages(INJECT_NTP_TIME); - mHandler.sendMessage(Message.obtain(mHandler, INJECT_NTP_TIME)); + sendMessage(INJECT_NTP_TIME, 0, null); } if (mDownloadXtraDataPending) { - mHandler.removeMessages(DOWNLOAD_XTRA_DATA); - mHandler.sendMessage(Message.obtain(mHandler, DOWNLOAD_XTRA_DATA)); + sendMessage(DOWNLOAD_XTRA_DATA, 0, null); } } } @@ -485,6 +486,7 @@ public class GpsLocationProvider implements LocationProviderInterface { } // send delayed message for next NTP injection + // since this is delayed and not urgent we do not hold a wake lock here mHandler.removeMessages(INJECT_NTP_TIME); mHandler.sendMessageDelayed(Message.obtain(mHandler, INJECT_NTP_TIME), delay); } @@ -507,6 +509,7 @@ public class GpsLocationProvider implements LocationProviderInterface { native_inject_xtra_data(data, data.length); } else { // try again later + // since this is delayed and not urgent we do not hold a wake lock here mHandler.removeMessages(DOWNLOAD_XTRA_DATA); mHandler.sendMessageDelayed(Message.obtain(mHandler, DOWNLOAD_XTRA_DATA), RETRY_INTERVAL); } @@ -517,10 +520,7 @@ public class GpsLocationProvider implements LocationProviderInterface { * Someday we might use this for network location injection to aid the GPS */ public void updateLocation(Location location) { - mHandler.removeMessages(UPDATE_LOCATION); - Message m = Message.obtain(mHandler, UPDATE_LOCATION); - m.obj = location; - mHandler.sendMessage(m); + sendMessage(UPDATE_LOCATION, 0, location); } private void handleUpdateLocation(Location location) { @@ -614,10 +614,7 @@ public class GpsLocationProvider implements LocationProviderInterface { */ public void enable() { synchronized (mHandler) { - mHandler.removeMessages(ENABLE); - Message m = Message.obtain(mHandler, ENABLE); - m.arg1 = 1; - mHandler.sendMessage(m); + sendMessage(ENABLE, 1, null); } } @@ -649,10 +646,7 @@ public class GpsLocationProvider implements LocationProviderInterface { */ public void disable() { synchronized (mHandler) { - mHandler.removeMessages(ENABLE); - Message m = Message.obtain(mHandler, ENABLE); - m.arg1 = 0; - mHandler.sendMessage(m); + sendMessage(ENABLE, 0, null); } } @@ -713,10 +707,7 @@ public class GpsLocationProvider implements LocationProviderInterface { public void enableLocationTracking(boolean enable) { synchronized (mHandler) { - mHandler.removeMessages(ENABLE_TRACKING); - Message m = Message.obtain(mHandler, ENABLE_TRACKING); - m.arg1 = (enable ? 1 : 0); - mHandler.sendMessage(m); + sendMessage(ENABLE_TRACKING, (enable ? 1 : 0), null); } } @@ -770,9 +761,13 @@ public class GpsLocationProvider implements LocationProviderInterface { } public void addListener(int uid) { - Message m = Message.obtain(mHandler, ADD_LISTENER); - m.arg1 = uid; - mHandler.sendMessage(m); + synchronized (mWakeLock) { + mPendingListenerMessages++; + mWakeLock.acquire(); + Message m = Message.obtain(mHandler, ADD_LISTENER); + m.arg1 = uid; + mHandler.sendMessage(m); + } } private void handleAddListener(int uid) { @@ -794,9 +789,13 @@ public class GpsLocationProvider implements LocationProviderInterface { } public void removeListener(int uid) { - Message m = Message.obtain(mHandler, REMOVE_LISTENER); - m.arg1 = uid; - mHandler.sendMessage(m); + synchronized (mWakeLock) { + mPendingListenerMessages++; + mWakeLock.acquire(); + Message m = Message.obtain(mHandler, REMOVE_LISTENER); + m.arg1 = uid; + mHandler.sendMessage(m); + } } private void handleRemoveListener(int uid) { @@ -823,8 +822,7 @@ public class GpsLocationProvider implements LocationProviderInterface { return deleteAidingData(extras); } if ("force_time_injection".equals(command)) { - mHandler.removeMessages(INJECT_NTP_TIME); - mHandler.sendMessage(Message.obtain(mHandler, INJECT_NTP_TIME)); + sendMessage(INJECT_NTP_TIME, 0, null); return true; } if ("force_xtra_injection".equals(command)) { @@ -1037,12 +1035,6 @@ public class GpsLocationProvider implements LocationProviderInterface { break; } - // beware, the events can come out of order - if ((mNavigating || mEngineOn) && !mWakeLock.isHeld()) { - if (DEBUG) Log.d(TAG, "Acquiring wakelock"); - mWakeLock.acquire(); - } - if (wasNavigating != mNavigating) { int size = mListeners.size(); for (int i = 0; i < size; i++) { @@ -1080,12 +1072,6 @@ public class GpsLocationProvider implements LocationProviderInterface { intent.putExtra(LocationManager.EXTRA_GPS_ENABLED, mNavigating); mContext.sendBroadcast(intent); } - - // beware, the events can come out of order - if (!mNavigating && !mEngineOn && mWakeLock.isHeld()) { - if (DEBUG) Log.d(TAG, "Releasing wakelock"); - mWakeLock.release(); - } } } @@ -1213,8 +1199,7 @@ public class GpsLocationProvider implements LocationProviderInterface { */ private void xtraDownloadRequest() { if (DEBUG) Log.d(TAG, "xtraDownloadRequest"); - mHandler.removeMessages(DOWNLOAD_XTRA_DATA); - mHandler.sendMessage(Message.obtain(mHandler, DOWNLOAD_XTRA_DATA)); + sendMessage(DOWNLOAD_XTRA_DATA, 0, null); } //============================================================= @@ -1329,11 +1314,25 @@ public class GpsLocationProvider implements LocationProviderInterface { } } + private void sendMessage(int message, int arg, Object obj) { + // hold a wake lock while messages are pending + synchronized (mWakeLock) { + mPendingMessageBits |= (1 << message); + mWakeLock.acquire(); + mHandler.removeMessages(message); + Message m = Message.obtain(mHandler, message); + m.arg1 = arg; + m.obj = obj; + mHandler.sendMessage(m); + } + } + private final class ProviderHandler extends Handler { @Override public void handleMessage(Message msg) { - switch (msg.what) { + int message = msg.what; + switch (message) { case ENABLE: if (msg.arg1 == 1) { handleEnable(); @@ -1365,6 +1364,16 @@ public class GpsLocationProvider implements LocationProviderInterface { handleRemoveListener(msg.arg1); break; } + // release wake lock if no messages are pending + synchronized (mWakeLock) { + mPendingMessageBits &= ~(1 << message); + if (message == ADD_LISTENER || message == REMOVE_LISTENER) { + mPendingListenerMessages--; + } + if (mPendingMessageBits == 0 && mPendingListenerMessages == 0) { + mWakeLock.release(); + } + } } }; |