rtc关机闹钟4 AlarmManagerService.java
vim base/services/core/java/com/android/server/AlarmManagerService.java
AlarmManager 调用 IAlarmManager, AlarmManagerService 是IAlarmManager的实现
private final IBinder mService = new IAlarmManager.Stub() {
@Override
public void set(int type, long triggerAtTime, long windowLength, long interval, int flags,
PendingIntent operation, WorkSource workSource,
AlarmManager.AlarmClockInfo alarmClock) {
final int callingUid = Binder.getCallingUid();
if (workSource != null) {
getContext().enforcePermission(
android.Manifest.permission.UPDATE_DEVICE_STATS,
Binder.getCallingPid(), callingUid, "AlarmManager.set");
}
// No incoming callers can request either WAKE_FROM_IDLE or
// ALLOW_WHILE_IDLE_UNRESTRICTED -- we will apply those later as appropriate.
flags &= ~(AlarmManager.FLAG_WAKE_FROM_IDLE
| AlarmManager.FLAG_ALLOW_WHILE_IDLE_UNRESTRICTED);
// Only the system can use FLAG_IDLE_UNTIL -- this is used to tell the alarm
// manager when to come out of idle mode, which is only for DeviceIdleController.
if (callingUid != Process.SYSTEM_UID) {
flags &= ~AlarmManager.FLAG_IDLE_UNTIL;
}
// If the caller is a core system component, and not calling to do work on behalf
// of someone else, then always set ALLOW_WHILE_IDLE_UNRESTRICTED. This means we
// will allow these alarms to go off as normal even while idle, with no timing
// restrictions.
if (callingUid < Process.FIRST_APPLICATION_UID && workSource == null) {
flags |= AlarmManager.FLAG_ALLOW_WHILE_IDLE_UNRESTRICTED;
}
// If this is an exact time alarm, then it can't be batched with other alarms.
if (windowLength == AlarmManager.WINDOW_EXACT) {
flags |= AlarmManager.FLAG_STANDALONE;
}
// If this alarm is for an alarm clock, then it must be standalone and we will
// use it to wake early from idle if needed.
if (alarmClock != null) {
flags |= AlarmManager.FLAG_WAKE_FROM_IDLE | AlarmManager.FLAG_STANDALONE;
}
setImpl(type, triggerAtTime, windowLength, interval, operation,
flags, workSource, alarmClock, callingUid);
}
void setImpl(int type, long triggerAtTime, long windowLength, long interval, PendingIntent operation, int flags, WorkSource workSource, AlarmManager.AlarmClockInfo alarmClock, int callingUid) { if (operation == null) { Slog.w(TAG, "set/setRepeating ignored because there is no intent"); return; } // Sanity check the window length. This will catch people mistakenly // trying to pass an end-of-window timestamp rather than a duration. if (windowLength > AlarmManager.INTERVAL_HALF_DAY) { Slog.w(TAG, "Window length " + windowLength + "ms suspiciously long; limiting to 1 hour"); windowLength = AlarmManager.INTERVAL_HOUR; } // Sanity check the recurrence interval. This will catch people who supply // seconds when the API expects milliseconds. final long minInterval = mConstants.MIN_INTERVAL; if (interval > 0 && interval < minInterval) { Slog.w(TAG, "Suspiciously short interval " + interval + " millis; expanding to " + (minInterval/1000) + " seconds"); interval = minInterval; } if (type < RTC_WAKEUP || type > ELAPSED_REALTIME) { throw new IllegalArgumentException("Invalid alarm type " + type); } if (triggerAtTime < 0) { final long what = Binder.getCallingPid(); Slog.w(TAG, "Invalid alarm trigger time! " + triggerAtTime + " from uid=" + callingUid + " pid=" + what); triggerAtTime = 0; } final long nowElapsed = SystemClock.elapsedRealtime(); final long nominalTrigger = convertToElapsed(triggerAtTime, type); // Try to prevent spamming by making sure we aren't firing alarms in the immediate future final long minTrigger = nowElapsed + mConstants.MIN_FUTURITY; final long triggerElapsed = (nominalTrigger > minTrigger) ? nominalTrigger : minTrigger; final long maxElapsed; if (windowLength == AlarmManager.WINDOW_EXACT) { maxElapsed = triggerElapsed; } else if (windowLength < 0) { maxElapsed = maxTriggerTime(nowElapsed, triggerElapsed, interval); // Fix this window in place, so that as time approaches we don't collapse it. windowLength = maxElapsed - triggerElapsed; } else { maxElapsed = triggerElapsed + windowLength; } synchronized (mLock) { if (DEBUG_BATCH) { Slog.v(TAG, "set(" + operation + ") : type=" + type + " triggerAtTime=" + triggerAtTime + " win=" + windowLength + " tElapsed=" + triggerElapsed + " maxElapsed=" + maxElapsed + " interval=" + interval + " flags=0x" + Integer.toHexString(flags)); } setImplLocked(type, triggerAtTime, triggerElapsed, windowLength, maxElapsed, interval, operation, flags, true, workSource, alarmClock, callingUid); } } private void setImplLocked(int type, long when, long whenElapsed, long windowLength, long maxWhen, long interval, PendingIntent operation, int flags, boolean doValidate, WorkSource workSource, AlarmManager.AlarmClockInfo alarmClock, int uid) { Alarm a = new Alarm(type, when, whenElapsed, windowLength, maxWhen, interval, operation, workSource, flags, alarmClock, uid); removeLocked(operation); setImplLocked(a, false, doValidate); } private void setImplLocked(Alarm a, boolean rebatching, boolean doValidate) { if ((a.flags&AlarmManager.FLAG_IDLE_UNTIL) != 0) { // This is a special alarm that will put the system into idle until it goes off. // The caller has given the time they want this to happen at, however we need // to pull that earlier if there are existing alarms that have requested to // bring us out of idle at an earlier time. if (mNextWakeFromIdle != null && a.whenElapsed > mNextWakeFromIdle.whenElapsed) { a.when = a.whenElapsed = a.maxWhenElapsed = mNextWakeFromIdle.whenElapsed; } // Add fuzz to make the alarm go off some time before the actual desired time. final long nowElapsed = SystemClock.elapsedRealtime(); final int fuzz = fuzzForDuration(a.whenElapsed-nowElapsed); if (fuzz > 0) { if (mRandom == null) { mRandom = new Random(); } final int delta = mRandom.nextInt(fuzz); a.whenElapsed -= delta; if (false) { Slog.d(TAG, "Alarm when: " + a.whenElapsed); Slog.d(TAG, "Delta until alarm: " + (a.whenElapsed-nowElapsed)); Slog.d(TAG, "Applied fuzz: " + fuzz); Slog.d(TAG, "Final delta: " + delta); Slog.d(TAG, "Final when: " + a.whenElapsed); } a.when = a.maxWhenElapsed = a.whenElapsed; } } else if (mPendingIdleUntil != null) { // We currently have an idle until alarm scheduled; if the new alarm has // not explicitly stated it wants to run while idle, then put it on hold. if ((a.flags&(AlarmManager.FLAG_ALLOW_WHILE_IDLE | AlarmManager.FLAG_ALLOW_WHILE_IDLE_UNRESTRICTED | AlarmManager.FLAG_WAKE_FROM_IDLE)) == 0) { mPendingWhileIdleAlarms.add(a); return; } } int whichBatch = ((a.flags&AlarmManager.FLAG_STANDALONE) != 0) ? -1 : attemptCoalesceLocked(a.whenElapsed, a.maxWhenElapsed); if (whichBatch < 0) { Batch batch = new Batch(a); addBatchLocked(mAlarmBatches, batch); } else { Batch batch = mAlarmBatches.get(whichBatch); if (batch.add(a)) { // The start time of this batch advanced, so batch ordering may // have just been broken. Move it to where it now belongs. mAlarmBatches.remove(whichBatch); addBatchLocked(mAlarmBatches, batch); } } if (a.alarmClock != null) { mNextAlarmClockMayChange = true; } boolean needRebatch = false; if ((a.flags&AlarmManager.FLAG_IDLE_UNTIL) != 0) { mPendingIdleUntil = a; mConstants.updateAllowWhileIdleMinTimeLocked(); needRebatch = true; } else if ((a.flags&AlarmManager.FLAG_WAKE_FROM_IDLE) != 0) { if (mNextWakeFromIdle == null || mNextWakeFromIdle.whenElapsed > a.whenElapsed) { mNextWakeFromIdle = a; // If this wake from idle is earlier than whatever was previously scheduled, // and we are currently idling, then we need to rebatch alarms in case the idle // until time needs to be updated. if (mPendingIdleUntil != null) { needRebatch = true; } } } if (!rebatching) { if (DEBUG_VALIDATE) { if (doValidate && !validateConsistencyLocked()) { Slog.v(TAG, "Tipping-point operation: type=" + a.type + " when=" + a.when + " when(hex)=" + Long.toHexString(a.when) + " whenElapsed=" + a.whenElapsed + " maxWhenElapsed=" + a.maxWhenElapsed + " interval=" + a.repeatInterval + " op=" + a.operation + " flags=0x" + Integer.toHexString(a.flags)); rebatchAllAlarmsLocked(false); needRebatch = false; } } if (needRebatch) { rebatchAllAlarmsLocked(false); } rescheduleKernelAlarmsLocked(); updateNextAlarmClockLocked(); } }
