services/java/com/android/server/am/BroadcastQueue.java

/*
 * Copyright (C) 2012 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.
 */

package com.android.server.am;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.ArrayList;

import android.app.ActivityManager;
import android.app.AppGlobals;
import android.app.AppOpsManager;
import android.content.ComponentName;
import android.content.IIntentReceiver;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.pm.ServiceInfo;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Process;
import android.os.RemoteException;
import android.os.SystemClock;
import android.os.UserHandle;
import android.util.EventLog;
import android.util.Log;
import android.util.Slog;

/**
 * BROADCASTS
 *
 * We keep two broadcast queues and associated bookkeeping, one for those at
 * foreground priority, and one for normal (background-priority) broadcasts.
 */
public class BroadcastQueue {
    static final String TAG = "BroadcastQueue";
    static final String TAG_MU = ActivityManagerService.TAG_MU;
    static final boolean DEBUG_BROADCAST = ActivityManagerService.DEBUG_BROADCAST;
    static final boolean DEBUG_BROADCAST_LIGHT = ActivityManagerService.DEBUG_BROADCAST_LIGHT;
    static final boolean DEBUG_MU = ActivityManagerService.DEBUG_MU;

    static final int MAX_BROADCAST_HISTORY = 25;
    static final int MAX_BROADCAST_SUMMARY_HISTORY = 100;

    final ActivityManagerService mService;

    /**
     * Recognizable moniker for this queue
     */
    final String mQueueName;

    /**
     * Timeout period for this queue's broadcasts
     */
    final long mTimeoutPeriod;

    /**
     * Lists of all active broadcasts that are to be executed immediately
     * (without waiting for another broadcast to finish).  Currently this only
     * contains broadcasts to registered receivers, to avoid spinning up
     * a bunch of processes to execute IntentReceiver components.  Background-
     * and foreground-priority broadcasts are queued separately.
     */
    final ArrayList<BroadcastRecord> mParallelBroadcasts
            = new ArrayList<BroadcastRecord>();
    /**
     * List of all active broadcasts that are to be executed one at a time.
     * The object at the top of the list is the currently activity broadcasts;
     * those after it are waiting for the top to finish.  As with parallel
     * broadcasts, separate background- and foreground-priority queues are
     * maintained.
     */
    final ArrayList<BroadcastRecord> mOrderedBroadcasts
            = new ArrayList<BroadcastRecord>();

    /**
     * Historical data of past broadcasts, for debugging.
     */
    final BroadcastRecord[] mBroadcastHistory
            = new BroadcastRecord[MAX_BROADCAST_HISTORY];

    /**
     * Summary of historical data of past broadcasts, for debugging.
     */
    final Intent[] mBroadcastSummaryHistory
            = new Intent[MAX_BROADCAST_SUMMARY_HISTORY];

    /**
     * Set when we current have a BROADCAST_INTENT_MSG in flight.
     */
    boolean mBroadcastsScheduled = false;

    /**
     * True if we have a pending unexpired BROADCAST_TIMEOUT_MSG posted to our handler.
     */
    boolean mPendingBroadcastTimeoutMessage;

    /**
     * Intent broadcasts that we have tried to start, but are
     * waiting for the application's process to be created.  We only
     * need one per scheduling class (instead of a list) because we always
     * process broadcasts one at a time, so no others can be started while
     * waiting for this one.
     */
    BroadcastRecord mPendingBroadcast = null;

    /**
     * The receiver index that is pending, to restart the broadcast if needed.
     */
    int mPendingBroadcastRecvIndex;

    static final int BROADCAST_INTENT_MSG = ActivityManagerService.FIRST_BROADCAST_QUEUE_MSG;
    static final int BROADCAST_TIMEOUT_MSG = ActivityManagerService.FIRST_BROADCAST_QUEUE_MSG + 1;

    final Handler mHandler = new Handler() {
        //public Handler() {
        //    if (localLOGV) Slog.v(TAG, "Handler started!");
        //}

        public void handleMessage(Message msg) {
            switch (msg.what) {
                case BROADCAST_INTENT_MSG: {
                    if (DEBUG_BROADCAST) Slog.v(
                            TAG, "Received BROADCAST_INTENT_MSG");
                    processNextBroadcast(true);
                } break;
                case BROADCAST_TIMEOUT_MSG: {
                    synchronized (mService) {
                        broadcastTimeoutLocked(true);
                    }
                } break;
            }
        }
    };

    private final class AppNotResponding implements Runnable {
        private final ProcessRecord mApp;
        private final String mAnnotation;

        public AppNotResponding(ProcessRecord app, String annotation) {
            mApp = app;
            mAnnotation = annotation;
        }

        @Override
        public void run() {
            mService.appNotResponding(mApp, null, null, false, mAnnotation);
        }
    }

    BroadcastQueue(ActivityManagerService service, String name, long timeoutPeriod) {
        mService = service;
        mQueueName = name;
        mTimeoutPeriod = timeoutPeriod;
    }

    public boolean isPendingBroadcastProcessLocked(int pid) {
        return mPendingBroadcast != null && mPendingBroadcast.curApp.pid == pid;
    }

    public void enqueueParallelBroadcastLocked(BroadcastRecord r) {
        mParallelBroadcasts.add(r);
    }

    public void enqueueOrderedBroadcastLocked(BroadcastRecord r) {
        mOrderedBroadcasts.add(r);
    }

    public final boolean replaceParallelBroadcastLocked(BroadcastRecord r) {
        for (int i=mParallelBroadcasts.size()-1; i>=0; i--) {
            if (r.intent.filterEquals(mParallelBroadcasts.get(i).intent)) {
                if (DEBUG_BROADCAST) Slog.v(TAG,
                        "***** DROPPING PARALLEL ["
                + mQueueName + "]: " + r.intent);
                mParallelBroadcasts.set(i, r);
                return true;
            }
        }
        return false;
    }

    public final boolean replaceOrderedBroadcastLocked(BroadcastRecord r) {
        for (int i=mOrderedBroadcasts.size()-1; i>0; i--) {
            if (r.intent.filterEquals(mOrderedBroadcasts.get(i).intent)) {
                if (DEBUG_BROADCAST) Slog.v(TAG,
                        "***** DROPPING ORDERED ["
                        + mQueueName + "]: " + r.intent);
                mOrderedBroadcasts.set(i, r);
                return true;
            }
        }
        return false;
    }

    private final void processCurBroadcastLocked(BroadcastRecord r,
            ProcessRecord app) throws RemoteException {
        if (DEBUG_BROADCAST)  Slog.v(TAG,
                "Process cur broadcast " + r + " for app " + app);
        if (app.thread == null) {
            throw new RemoteException();
        }
        r.receiver = app.thread.asBinder();
        r.curApp = app;
        app.curReceiver = r;
        mService.updateLruProcessLocked(app, true);

        // Tell the application to launch this receiver.
        r.intent.setComponent(r.curComponent);

        boolean started = false;
        try {
            if (DEBUG_BROADCAST_LIGHT) Slog.v(TAG,
                    "Delivering to component " + r.curComponent
                    + ": " + r);
            mService.ensurePackageDexOpt(r.intent.getComponent().getPackageName());
            app.thread.scheduleReceiver(new Intent(r.intent), r.curReceiver,
                    mService.compatibilityInfoForPackageLocked(r.curReceiver.applicationInfo),
                    r.resultCode, r.resultData, r.resultExtras, r.ordered, r.userId);
            if (DEBUG_BROADCAST)  Slog.v(TAG,
                    "Process cur broadcast " + r + " DELIVERED for app " + app);
            started = true;
        } finally {
            if (!started) {
                if (DEBUG_BROADCAST)  Slog.v(TAG,
                        "Process cur broadcast " + r + ": NOT STARTED!");
                r.receiver = null;
                r.curApp = null;
                app.curReceiver = null;
            }
        }
    }

    public boolean sendPendingBroadcastsLocked(ProcessRecord app) {
        boolean didSomething = false;
        final BroadcastRecord br = mPendingBroadcast;
        if (br != null && br.curApp.pid == app.pid) {
            try {
                mPendingBroadcast = null;
                processCurBroadcastLocked(br, app);
                didSomething = true;
            } catch (Exception e) {
                Slog.w(TAG, "Exception in new application when starting receiver "
                        + br.curComponent.flattenToShortString(), e);
                logBroadcastReceiverDiscardLocked(br);
                finishReceiverLocked(br, br.resultCode, br.resultData,
                        br.resultExtras, br.resultAbort, true);
                scheduleBroadcastsLocked();
                // We need to reset the state if we failed to start the receiver.
                br.state = BroadcastRecord.IDLE;
                throw new RuntimeException(e.getMessage());
            }
        }
        return didSomething;
    }

    public void skipPendingBroadcastLocked(int pid) {
        final BroadcastRecord br = mPendingBroadcast;
        if (br != null && br.curApp.pid == pid) {
            br.state = BroadcastRecord.IDLE;
            br.nextReceiver = mPendingBroadcastRecvIndex;
            mPendingBroadcast = null;
            scheduleBroadcastsLocked();
        }
    }

    public void skipCurrentReceiverLocked(ProcessRecord app) {
        boolean reschedule = false;
        BroadcastRecord r = app.curReceiver;
        if (r != null) {
            // The current broadcast is waiting for this app's receiver
            // to be finished.  Looks like that's not going to happen, so
            // let the broadcast continue.
            logBroadcastReceiverDiscardLocked(r);
            finishReceiverLocked(r, r.resultCode, r.resultData,
                    r.resultExtras, r.resultAbort, true);
            reschedule = true;
        }

        r = mPendingBroadcast;
        if (r != null && r.curApp == app) {
            if (DEBUG_BROADCAST) Slog.v(TAG,
                    "[" + mQueueName + "] skip & discard pending app " + r);
            logBroadcastReceiverDiscardLocked(r);
            finishReceiverLocked(r, r.resultCode, r.resultData,
                    r.resultExtras, r.resultAbort, true);
            reschedule = true;
        }
        if (reschedule) {
            scheduleBroadcastsLocked();
        }
    }

    public void scheduleBroadcastsLocked() {
        if (DEBUG_BROADCAST) Slog.v(TAG, "Schedule broadcasts ["
                + mQueueName + "]: current="
                + mBroadcastsScheduled);

        if (mBroadcastsScheduled) {
            return;
        }
        mHandler.sendMessage(mHandler.obtainMessage(BROADCAST_INTENT_MSG, this));
        mBroadcastsScheduled = true;
    }

    public BroadcastRecord getMatchingOrderedReceiver(IBinder receiver) {
        if (mOrderedBroadcasts.size() > 0) {
            final BroadcastRecord r = mOrderedBroadcasts.get(0);
            if (r != null && r.receiver == receiver) {
                return r;
            }
        }
        return null;
    }

    public boolean finishReceiverLocked(BroadcastRecord r, int resultCode,
            String resultData, Bundle resultExtras, boolean resultAbort,
            boolean explicit) {
        int state = r.state;
        r.state = BroadcastRecord.IDLE;
        if (state == BroadcastRecord.IDLE) {
            if (explicit) {
                Slog.w(TAG, "finishReceiver [" + mQueueName + "] called but state is IDLE");
            }
        }
        r.receiver = null;
        r.intent.setComponent(null);
        if (r.curApp != null) {
            r.curApp.curReceiver = null;
        }
        if (r.curFilter != null) {
            r.curFilter.receiverList.curBroadcast = null;
        }
        r.curFilter = null;
        r.curApp = null;
        r.curComponent = null;
        r.curReceiver = null;
        mPendingBroadcast = null;

        r.resultCode = resultCode;
        r.resultData = resultData;
        r.resultExtras = resultExtras;
        r.resultAbort = resultAbort;

        // We will process the next receiver right now if this is finishing
        // an app receiver (which is always asynchronous) or after we have
        // come back from calling a receiver.
        return state == BroadcastRecord.APP_RECEIVE
                || state == BroadcastRecord.CALL_DONE_RECEIVE;
    }

    private static void performReceiveLocked(ProcessRecord app, IIntentReceiver receiver,
            Intent intent, int resultCode, String data, Bundle extras,
            boolean ordered, boolean sticky, int sendingUser) throws RemoteException {
        // Send the intent to the receiver asynchronously using one-way binder calls.
        if (app != null && app.thread != null) {
            // If we have an app thread, do the call through that so it is
            // correctly ordered with other one-way calls.
            app.thread.scheduleRegisteredReceiver(receiver, intent, resultCode,
                    data, extras, ordered, sticky, sendingUser);
        } else {
            receiver.performReceive(intent, resultCode, data, extras, ordered,
                    sticky, sendingUser);
        }
    }

    private final void deliverToRegisteredReceiverLocked(BroadcastRecord r,
            BroadcastFilter filter, boolean ordered) {
        boolean skip = false;
        if (filter.requiredPermission != null) {
            int perm = mService.checkComponentPermission(filter.requiredPermission,
                    r.callingPid, r.callingUid, -1, true);
            if (perm != PackageManager.PERMISSION_GRANTED) {
                Slog.w(TAG, "Permission Denial: broadcasting "
                        + r.intent.toString()
                        + " from " + r.callerPackage + " (pid="
                        + r.callingPid + ", uid=" + r.callingUid + ")"
                        + " requires " + filter.requiredPermission
                        + " due to registered receiver " + filter);
                skip = true;
            }
        }
        if (!skip && r.requiredPermission != null) {
            int perm = mService.checkComponentPermission(r.requiredPermission,
                    filter.receiverList.pid, filter.receiverList.uid, -1, true);
            if (perm != PackageManager.PERMISSION_GRANTED) {
                Slog.w(TAG, "Permission Denial: receiving "
                        + r.intent.toString()
                        + " to " + filter.receiverList.app
                        + " (pid=" + filter.receiverList.pid
                        + ", uid=" + filter.receiverList.uid + ")"
                        + " requires " + r.requiredPermission
                        + " due to sender " + r.callerPackage
                        + " (uid " + r.callingUid + ")");
                skip = true;
            }
        }
        if (r.appOp != AppOpsManager.OP_NONE) {
            int mode = mService.mAppOpsService.checkOperation(r.appOp,
                    filter.receiverList.uid, filter.packageName);
            if (mode != AppOpsManager.MODE_ALLOWED) {
                if (DEBUG_BROADCAST)  Slog.v(TAG,
                        "App op " + r.appOp + " not allowed for broadcast to uid "
                        + filter.receiverList.uid + " pkg " + filter.packageName);
                skip = true;
            }
        }

        if (!skip) {
            // If this is not being sent as an ordered broadcast, then we
            // don't want to touch the fields that keep track of the current
            // state of ordered broadcasts.
            if (ordered) {
                r.receiver = filter.receiverList.receiver.asBinder();
                r.curFilter = filter;
                filter.receiverList.curBroadcast = r;
                r.state = BroadcastRecord.CALL_IN_RECEIVE;
                if (filter.receiverList.app != null) {
                    // Bump hosting application to no longer be in background
                    // scheduling class.  Note that we can't do that if there
                    // isn't an app...  but we can only be in that case for
                    // things that directly call the IActivityManager API, which
                    // are already core system stuff so don't matter for this.
                    r.curApp = filter.receiverList.app;
                    filter.receiverList.app.curReceiver = r;
                    mService.updateOomAdjLocked();
                }
            }
            try {
                if (DEBUG_BROADCAST_LIGHT) {
                    int seq = r.intent.getIntExtra("seq", -1);
                    Slog.i(TAG, "Delivering to " + filter
                            + " (seq=" + seq + "): " + r);
                }
                performReceiveLocked(filter.receiverList.app, filter.receiverList.receiver,
                    new Intent(r.intent), r.resultCode, r.resultData,
                    r.resultExtras, r.ordered, r.initialSticky, r.userId);
                if (ordered) {
                    r.state = BroadcastRecord.CALL_DONE_RECEIVE;
                }
            } catch (RemoteException e) {
                Slog.w(TAG, "Failure sending broadcast " + r.intent, e);
                if (ordered) {
                    r.receiver = null;
                    r.curFilter = null;
                    filter.receiverList.curBroadcast = null;
                    if (filter.receiverList.app != null) {
                        filter.receiverList.app.curReceiver = null;
                    }
                }
            }
        }
    }

    final void processNextBroadcast(boolean fromMsg) {
        synchronized(mService) {
            BroadcastRecord r;

            if (DEBUG_BROADCAST) Slog.v(TAG, "processNextBroadcast ["
                    + mQueueName + "]: "
                    + mParallelBroadcasts.size() + " broadcasts, "
                    + mOrderedBroadcasts.size() + " ordered broadcasts");

            mService.updateCpuStats();

            if (fromMsg) {
                mBroadcastsScheduled = false;
            }

            // First, deliver any non-serialized broadcasts right away.
            while (mParallelBroadcasts.size() > 0) {
                r = mParallelBroadcasts.remove(0);
                r.dispatchTime = SystemClock.uptimeMillis();
                r.dispatchClockTime = System.currentTimeMillis();
                final int N = r.receivers.size();
                if (DEBUG_BROADCAST_LIGHT) Slog.v(TAG, "Processing parallel broadcast ["
                        + mQueueName + "] " + r);
                for (int i=0; i<N; i++) {
                    Object target = r.receivers.get(i);
                    if (DEBUG_BROADCAST)  Slog.v(TAG,
                            "Delivering non-ordered on [" + mQueueName + "] to registered "
                            + target + ": " + r);
                    deliverToRegisteredReceiverLocked(r, (BroadcastFilter)target, false);
                }
                addBroadcastToHistoryLocked(r);
                if (DEBUG_BROADCAST_LIGHT) Slog.v(TAG, "Done with parallel broadcast ["
                        + mQueueName + "] " + r);
            }

            // Now take care of the next serialized one...

            // If we are waiting for a process to come up to handle the next
            // broadcast, then do nothing at this point.  Just in case, we
            // check that the process we're waiting for still exists.
            if (mPendingBroadcast != null) {
                if (DEBUG_BROADCAST_LIGHT) {
                    Slog.v(TAG, "processNextBroadcast ["
                            + mQueueName + "]: waiting for "
                            + mPendingBroadcast.curApp);
                }

                boolean isDead;
                synchronized (mService.mPidsSelfLocked) {
                    isDead = (mService.mPidsSelfLocked.get(
                            mPendingBroadcast.curApp.pid) == null);
                }
                if (!isDead) {
                    // It's still alive, so keep waiting
                    return;
                } else {
                    Slog.w(TAG, "pending app  ["
                            + mQueueName + "]" + mPendingBroadcast.curApp
                            + " died before responding to broadcast");
                    mPendingBroadcast.state = BroadcastRecord.IDLE;
                    mPendingBroadcast.nextReceiver = mPendingBroadcastRecvIndex;
                    mPendingBroadcast = null;
                }
            }

            boolean looped = false;
            
            do {
                if (mOrderedBroadcasts.size() == 0) {
                    // No more broadcasts pending, so all done!
                    mService.scheduleAppGcsLocked();
                    if (looped) {
                        // If we had finished the last ordered broadcast, then
                        // make sure all processes have correct oom and sched
                        // adjustments.
                        mService.updateOomAdjLocked();
                    }
                    return;
                }
                r = mOrderedBroadcasts.get(0);
                boolean forceReceive = false;

                // Ensure that even if something goes awry with the timeout
                // detection, we catch "hung" broadcasts here, discard them,
                // and continue to make progress.
                //
                // This is only done if the system is ready so that PRE_BOOT_COMPLETED
                // receivers don't get executed with timeouts. They're intended for
                // one time heavy lifting after system upgrades and can take
                // significant amounts of time.
                int numReceivers = (r.receivers != null) ? r.receivers.size() : 0;
                if (mService.mProcessesReady && r.dispatchTime > 0) {
                    long now = SystemClock.uptimeMillis();
                    if ((numReceivers > 0) &&
                            (now > r.dispatchTime + (2*mTimeoutPeriod*numReceivers))) {
                        Slog.w(TAG, "Hung broadcast ["
                                + mQueueName + "] discarded after timeout failure:"
                                + " now=" + now
                                + " dispatchTime=" + r.dispatchTime
                                + " startTime=" + r.receiverTime
                                + " intent=" + r.intent
                                + " numReceivers=" + numReceivers
                                + " nextReceiver=" + r.nextReceiver
                                + " state=" + r.state);
                        broadcastTimeoutLocked(false); // forcibly finish this broadcast
                        forceReceive = true;
                        r.state = BroadcastRecord.IDLE;
                    }
                }

                if (r.state != BroadcastRecord.IDLE) {
                    if (DEBUG_BROADCAST) Slog.d(TAG,
                            "processNextBroadcast("
                            + mQueueName + ") called when not idle (state="
                            + r.state + ")");
                    return;
                }

                if (r.receivers == null || r.nextReceiver >= numReceivers
                        || r.resultAbort || forceReceive) {
                    // No more receivers for this broadcast!  Send the final
                    // result if requested...
                    if (r.resultTo != null) {
                        try {
                            if (DEBUG_BROADCAST) {
                                int seq = r.intent.getIntExtra("seq", -1);
                                Slog.i(TAG, "Finishing broadcast ["
                                        + mQueueName + "] " + r.intent.getAction()
                                        + " seq=" + seq + " app=" + r.callerApp);
                            }
                            performReceiveLocked(r.callerApp, r.resultTo,
                                new Intent(r.intent), r.resultCode,
                                r.resultData, r.resultExtras, false, false, r.userId);
                            // Set this to null so that the reference
                            // (local and remote) isnt kept in the mBroadcastHistory.
                            r.resultTo = null;
                        } catch (RemoteException e) {
                            Slog.w(TAG, "Failure ["
                                    + mQueueName + "] sending broadcast result of "
                                    + r.intent, e);
                        }
                    }

                    if (DEBUG_BROADCAST) Slog.v(TAG, "Cancelling BROADCAST_TIMEOUT_MSG");
                    cancelBroadcastTimeoutLocked();

                    if (DEBUG_BROADCAST_LIGHT) Slog.v(TAG, "Finished with ordered broadcast "
                            + r);

                    // ... and on to the next...
                    addBroadcastToHistoryLocked(r);
                    mOrderedBroadcasts.remove(0);
                    r = null;
                    looped = true;
                    continue;
                }
            } while (r == null);

            // Get the next receiver...
            int recIdx = r.nextReceiver++;

            // Keep track of when this receiver started, and make sure there
            // is a timeout message pending to kill it if need be.
            r.receiverTime = SystemClock.uptimeMillis();
            if (recIdx == 0) {
                r.dispatchTime = r.receiverTime;
                r.dispatchClockTime = System.currentTimeMillis();
                if (DEBUG_BROADCAST_LIGHT) Slog.v(TAG, "Processing ordered broadcast ["
                        + mQueueName + "] " + r);
            }
            if (! mPendingBroadcastTimeoutMessage) {
                long timeoutTime = r.receiverTime + mTimeoutPeriod;
                if (DEBUG_BROADCAST) Slog.v(TAG,
                        "Submitting BROADCAST_TIMEOUT_MSG ["
                        + mQueueName + "] for " + r + " at " + timeoutTime);
                setBroadcastTimeoutLocked(timeoutTime);
            }

            Object nextReceiver = r.receivers.get(recIdx);
            if (nextReceiver instanceof BroadcastFilter) {
                // Simple case: this is a registered receiver who gets
                // a direct call.
                BroadcastFilter filter = (BroadcastFilter)nextReceiver;
                if (DEBUG_BROADCAST)  Slog.v(TAG,
                        "Delivering ordered ["
                        + mQueueName + "] to registered "
                        + filter + ": " + r);
                deliverToRegisteredReceiverLocked(r, filter, r.ordered);
                if (r.receiver == null || !r.ordered) {
                    // The receiver has already finished, so schedule to
                    // process the next one.
                    if (DEBUG_BROADCAST) Slog.v(TAG, "Quick finishing ["
                            + mQueueName + "]: ordered="
                            + r.ordered + " receiver=" + r.receiver);
                    r.state = BroadcastRecord.IDLE;
                    scheduleBroadcastsLocked();
                }
                return;
            }

            // Hard case: need to instantiate the receiver, possibly
            // starting its application process to host it.

            ResolveInfo info =
                (ResolveInfo)nextReceiver;
            ComponentName component = new ComponentName(
                    info.activityInfo.applicationInfo.packageName,
                    info.activityInfo.name);

            boolean skip = false;
            int perm = mService.checkComponentPermission(info.activityInfo.permission,
                    r.callingPid, r.callingUid, info.activityInfo.applicationInfo.uid,
                    info.activityInfo.exported);
            if (perm != PackageManager.PERMISSION_GRANTED) {
                if (!info.activityInfo.exported) {
                    Slog.w(TAG, "Permission Denial: broadcasting "
                            + r.intent.toString()
                            + " from " + r.callerPackage + " (pid=" + r.callingPid
                            + ", uid=" + r.callingUid + ")"
                            + " is not exported from uid " + info.activityInfo.applicationInfo.uid
                            + " due to receiver " + component.flattenToShortString());
                } else {
                    Slog.w(TAG, "Permission Denial: broadcasting "
                            + r.intent.toString()
                            + " from " + r.callerPackage + " (pid=" + r.callingPid
                            + ", uid=" + r.callingUid + ")"
                            + " requires " + info.activityInfo.permission
                            + " due to receiver " + component.flattenToShortString());
                }
                skip = true;
            }
            if (info.activityInfo.applicationInfo.uid != Process.SYSTEM_UID &&
                r.requiredPermission != null) {
                try {
                    perm = AppGlobals.getPackageManager().
                            checkPermission(r.requiredPermission,
                                    info.activityInfo.applicationInfo.packageName);
                } catch (RemoteException e) {
                    perm = PackageManager.PERMISSION_DENIED;
                }
                if (perm != PackageManager.PERMISSION_GRANTED) {
                    Slog.w(TAG, "Permission Denial: receiving "
                            + r.intent + " to "
                            + component.flattenToShortString()
                            + " requires " + r.requiredPermission
                            + " due to sender " + r.callerPackage
                            + " (uid " + r.callingUid + ")");
                    skip = true;
                }
            }
            if (r.appOp != AppOpsManager.OP_NONE) {
                int mode = mService.mAppOpsService.checkOperation(r.appOp,
                        info.activityInfo.applicationInfo.uid, info.activityInfo.packageName);
                if (mode != AppOpsManager.MODE_ALLOWED) {
                    if (DEBUG_BROADCAST)  Slog.v(TAG,
                            "App op " + r.appOp + " not allowed for broadcast to uid "
                            + info.activityInfo.applicationInfo.uid + " pkg "
                            + info.activityInfo.packageName);
                    skip = true;
                }
            }
            boolean isSingleton = false;
            try {
                isSingleton = mService.isSingleton(info.activityInfo.processName,
                        info.activityInfo.applicationInfo,
                        info.activityInfo.name, info.activityInfo.flags);
            } catch (SecurityException e) {
                Slog.w(TAG, e.getMessage());
                skip = true;
            }
            if ((info.activityInfo.flags&ActivityInfo.FLAG_SINGLE_USER) != 0) {
                if (ActivityManager.checkUidPermission(
                        android.Manifest.permission.INTERACT_ACROSS_USERS,
                        info.activityInfo.applicationInfo.uid)
                                != PackageManager.PERMISSION_GRANTED) {
                    Slog.w(TAG, "Permission Denial: Receiver " + component.flattenToShortString()
                            + " requests FLAG_SINGLE_USER, but app does not hold "
                            + android.Manifest.permission.INTERACT_ACROSS_USERS);
                    skip = true;
                }
            }
            if (r.curApp != null && r.curApp.crashing) {
                // If the target process is crashing, just skip it.
                if (DEBUG_BROADCAST)  Slog.v(TAG,
                        "Skipping deliver ordered ["
                        + mQueueName + "] " + r + " to " + r.curApp
                        + ": process crashing");
                skip = true;
            }

            if (skip) {
                if (DEBUG_BROADCAST)  Slog.v(TAG,
                        "Skipping delivery of ordered ["
                        + mQueueName + "] " + r + " for whatever reason");
                r.receiver = null;
                r.curFilter = null;
                r.state = BroadcastRecord.IDLE;
                scheduleBroadcastsLocked();
                return;
            }

            r.state = BroadcastRecord.APP_RECEIVE;
            String targetProcess = info.activityInfo.processName;
            r.curComponent = component;
            if (r.callingUid != Process.SYSTEM_UID && isSingleton) {
                info.activityInfo = mService.getActivityInfoForUser(info.activityInfo, 0);
            }
            r.curReceiver = info.activityInfo;
            if (DEBUG_MU && r.callingUid > UserHandle.PER_USER_RANGE) {
                Slog.v(TAG_MU, "Updated broadcast record activity info for secondary user, "
                        + info.activityInfo + ", callingUid = " + r.callingUid + ", uid = "
                        + info.activityInfo.applicationInfo.uid);
            }

            // Broadcast is being executed, its package can't be stopped.
            try {
                AppGlobals.getPackageManager().setPackageStoppedState(
                        r.curComponent.getPackageName(), false, UserHandle.getUserId(r.callingUid));
            } catch (RemoteException e) {
            } catch (IllegalArgumentException e) {
                Slog.w(TAG, "Failed trying to unstop package "
                        + r.curComponent.getPackageName() + ": " + e);
            }

            // Is this receiver's application already running?
            ProcessRecord app = mService.getProcessRecordLocked(targetProcess,
                    info.activityInfo.applicationInfo.uid);
            if (app != null && app.thread != null) {
                try {
                    app.addPackage(info.activityInfo.packageName);
                    processCurBroadcastLocked(r, app);
                    return;
                } catch (RemoteException e) {
                    Slog.w(TAG, "Exception when sending broadcast to "
                          + r.curComponent, e);
                } catch (RuntimeException e) {
                    Log.wtf(TAG, "Failed sending broadcast to "
                            + r.curComponent + " with " + r.intent, e);
                    // If some unexpected exception happened, just skip
                    // this broadcast.  At this point we are not in the call
                    // from a client, so throwing an exception out from here
                    // will crash the entire system instead of just whoever
                    // sent the broadcast.
                    logBroadcastReceiverDiscardLocked(r);
                    finishReceiverLocked(r, r.resultCode, r.resultData,
                            r.resultExtras, r.resultAbort, true);
                    scheduleBroadcastsLocked();
                    // We need to reset the state if we failed to start the receiver.
                    r.state = BroadcastRecord.IDLE;
                    return;
                }

                // If a dead object exception was thrown -- fall through to
                // restart the application.
            }

            // Not running -- get it started, to be executed when the app comes up.
            if (DEBUG_BROADCAST)  Slog.v(TAG,
                    "Need to start app ["
                    + mQueueName + "] " + targetProcess + " for broadcast " + r);
            if ((r.curApp=mService.startProcessLocked(targetProcess,
                    info.activityInfo.applicationInfo, true,
                    r.intent.getFlags() | Intent.FLAG_FROM_BACKGROUND,
                    "broadcast", r.curComponent,
                    (r.intent.getFlags()&Intent.FLAG_RECEIVER_BOOT_UPGRADE) != 0, false))
                            == null) {
                // Ah, this recipient is unavailable.  Finish it if necessary,
                // and mark the broadcast record as ready for the next.
                Slog.w(TAG, "Unable to launch app "
                        + info.activityInfo.applicationInfo.packageName + "/"
                        + info.activityInfo.applicationInfo.uid + " for broadcast "
                        + r.intent + ": process is bad");
                logBroadcastReceiverDiscardLocked(r);
                finishReceiverLocked(r, r.resultCode, r.resultData,
                        r.resultExtras, r.resultAbort, true);
                scheduleBroadcastsLocked();
                r.state = BroadcastRecord.IDLE;
                return;
            }

            mPendingBroadcast = r;
            mPendingBroadcastRecvIndex = recIdx;
        }
    }

    final void setBroadcastTimeoutLocked(long timeoutTime) {
        if (! mPendingBroadcastTimeoutMessage) {
            Message msg = mHandler.obtainMessage(BROADCAST_TIMEOUT_MSG, this);
            mHandler.sendMessageAtTime(msg, timeoutTime);
            mPendingBroadcastTimeoutMessage = true;
        }
    }

    final void cancelBroadcastTimeoutLocked() {
        if (mPendingBroadcastTimeoutMessage) {
            mHandler.removeMessages(BROADCAST_TIMEOUT_MSG, this);
            mPendingBroadcastTimeoutMessage = false;
        }
    }

    final void broadcastTimeoutLocked(boolean fromMsg) {
        if (fromMsg) {
            mPendingBroadcastTimeoutMessage = false;
        }

        if (mOrderedBroadcasts.size() == 0) {
            return;
        }

        long now = SystemClock.uptimeMillis();
        BroadcastRecord r = mOrderedBroadcasts.get(0);
        if (fromMsg) {
            if (mService.mDidDexOpt) {
                // Delay timeouts until dexopt finishes.
                mService.mDidDexOpt = false;
                long timeoutTime = SystemClock.uptimeMillis() + mTimeoutPeriod;
                setBroadcastTimeoutLocked(timeoutTime);
                return;
            }
            if (!mService.mProcessesReady) {
                // Only process broadcast timeouts if the system is ready. That way
                // PRE_BOOT_COMPLETED broadcasts can't timeout as they are intended
                // to do heavy lifting for system up.
                return;
            }

            long timeoutTime = r.receiverTime + mTimeoutPeriod;
            if (timeoutTime > now) {
                // We can observe premature timeouts because we do not cancel and reset the
                // broadcast timeout message after each receiver finishes.  Instead, we set up
                // an initial timeout then kick it down the road a little further as needed
                // when it expires.
                if (DEBUG_BROADCAST) Slog.v(TAG,
                        "Premature timeout ["
                        + mQueueName + "] @ " + now + ": resetting BROADCAST_TIMEOUT_MSG for "
                        + timeoutTime);
                setBroadcastTimeoutLocked(timeoutTime);
                return;
            }
        }

        Slog.w(TAG, "Timeout of broadcast " + r + " - receiver=" + r.receiver
                + ", started " + (now - r.receiverTime) + "ms ago");
        r.receiverTime = now;
        r.anrCount++;

        // Current receiver has passed its expiration date.
        if (r.nextReceiver <= 0) {
            Slog.w(TAG, "Timeout on receiver with nextReceiver <= 0");
            return;
        }

        ProcessRecord app = null;
        String anrMessage = null;

        Object curReceiver = r.receivers.get(r.nextReceiver-1);
        Slog.w(TAG, "Receiver during timeout: " + curReceiver);
        logBroadcastReceiverDiscardLocked(r);
        if (curReceiver instanceof BroadcastFilter) {
            BroadcastFilter bf = (BroadcastFilter)curReceiver;
            if (bf.receiverList.pid != 0
                    && bf.receiverList.pid != ActivityManagerService.MY_PID) {
                synchronized (mService.mPidsSelfLocked) {
                    app = mService.mPidsSelfLocked.get(
                            bf.receiverList.pid);
                }
            }
        } else {
            app = r.curApp;
        }

        if (app != null) {
            anrMessage = "Broadcast of " + r.intent.toString();
        }

        if (mPendingBroadcast == r) {
            mPendingBroadcast = null;
        }

        // Move on to the next receiver.
        finishReceiverLocked(r, r.resultCode, r.resultData,
                r.resultExtras, r.resultAbort, true);
        scheduleBroadcastsLocked();

        if (anrMessage != null) {
            // Post the ANR to the handler since we do not want to process ANRs while
            // potentially holding our lock.
            mHandler.post(new AppNotResponding(app, anrMessage));
        }
    }

    private final void addBroadcastToHistoryLocked(BroadcastRecord r) {
        if (r.callingUid < 0) {
            // This was from a registerReceiver() call; ignore it.
            return;
        }
        System.arraycopy(mBroadcastHistory, 0, mBroadcastHistory, 1,
                MAX_BROADCAST_HISTORY-1);
        r.finishTime = SystemClock.uptimeMillis();
        mBroadcastHistory[0] = r;
        System.arraycopy(mBroadcastSummaryHistory, 0, mBroadcastSummaryHistory, 1,
                MAX_BROADCAST_SUMMARY_HISTORY-1);
        mBroadcastSummaryHistory[0] = r.intent;
    }

    final void logBroadcastReceiverDiscardLocked(BroadcastRecord r) {
        if (r.nextReceiver > 0) {
            Object curReceiver = r.receivers.get(r.nextReceiver-1);
            if (curReceiver instanceof BroadcastFilter) {
                BroadcastFilter bf = (BroadcastFilter) curReceiver;
                EventLog.writeEvent(EventLogTags.AM_BROADCAST_DISCARD_FILTER,
                        bf.owningUserId, System.identityHashCode(r),
                        r.intent.getAction(),
                        r.nextReceiver - 1,
                        System.identityHashCode(bf));
            } else {
                ResolveInfo ri = (ResolveInfo)curReceiver;
                EventLog.writeEvent(EventLogTags.AM_BROADCAST_DISCARD_APP,
                        UserHandle.getUserId(ri.activityInfo.applicationInfo.uid),
                        System.identityHashCode(r), r.intent.getAction(),
                        r.nextReceiver - 1, ri.toString());
            }
        } else {
            Slog.w(TAG, "Discarding broadcast before first receiver is invoked: "
                    + r);
            EventLog.writeEvent(EventLogTags.AM_BROADCAST_DISCARD_APP,
                    -1, System.identityHashCode(r),
                    r.intent.getAction(),
                    r.nextReceiver,
                    "NONE");
        }
    }

    final boolean dumpLocked(FileDescriptor fd, PrintWriter pw, String[] args,
            int opti, boolean dumpAll, String dumpPackage, boolean needSep) {
        if (mParallelBroadcasts.size() > 0 || mOrderedBroadcasts.size() > 0
                || mPendingBroadcast != null) {
            boolean printed = false;
            for (int i=mParallelBroadcasts.size()-1; i>=0; i--) {
                BroadcastRecord br = mParallelBroadcasts.get(i);
                if (dumpPackage != null && !dumpPackage.equals(br.callerPackage)) {
                    continue;
                }
                if (!printed) {
                    if (needSep) {
                        pw.println();
                    }
                    needSep = true;
                    printed = true;
                    pw.println("  Active broadcasts [" + mQueueName + "]:");
                }
                pw.println("  Active Broadcast " + mQueueName + " #" + i + ":");
                br.dump(pw, "    ");
            }
            printed = false;
            needSep = true;
            for (int i=mOrderedBroadcasts.size()-1; i>=0; i--) {
                BroadcastRecord br = mOrderedBroadcasts.get(i);
                if (dumpPackage != null && !dumpPackage.equals(br.callerPackage)) {
                    continue;
                }
                if (!printed) {
                    if (needSep) {
                        pw.println();
                    }
                    needSep = true;
                    printed = true;
                    pw.println("  Active ordered broadcasts [" + mQueueName + "]:");
                }
                pw.println("  Active Ordered Broadcast " + mQueueName + " #" + i + ":");
                mOrderedBroadcasts.get(i).dump(pw, "    ");
            }
            if (dumpPackage == null || (mPendingBroadcast != null
                    && dumpPackage.equals(mPendingBroadcast.callerPackage))) {
                if (needSep) {
                    pw.println();
                }
                pw.println("  Pending broadcast [" + mQueueName + "]:");
                if (mPendingBroadcast != null) {
                    mPendingBroadcast.dump(pw, "    ");
                } else {
                    pw.println("    (null)");
                }
                needSep = true;
            }
        }

        int i;
        boolean printed = false;
        for (i=0; i<MAX_BROADCAST_HISTORY; i++) {
            BroadcastRecord r = mBroadcastHistory[i];
            if (r == null) {
                break;
            }
            if (dumpPackage != null && !dumpPackage.equals(r.callerPackage)) {
                continue;
            }
            if (!printed) {
                if (needSep) {
                    pw.println();
                }
                needSep = true;
                pw.println("  Historical broadcasts [" + mQueueName + "]:");
                printed = true;
            }
            if (dumpAll) {
                pw.print("  Historical Broadcast " + mQueueName + " #");
                        pw.print(i); pw.println(":");
                r.dump(pw, "    ");
            } else {
                pw.print("  #"); pw.print(i); pw.print(": "); pw.println(r);
                pw.print("    ");
                pw.println(r.intent.toShortString(false, true, true, false));
                Bundle bundle = r.intent.getExtras();
                if (bundle != null) {
                    pw.print("    extras: "); pw.println(bundle.toString());
                }
            }
        }

        if (dumpPackage == null) {
            if (dumpAll) {
                i = 0;
                printed = false;
            }
            for (; i<MAX_BROADCAST_SUMMARY_HISTORY; i++) {
                Intent intent = mBroadcastSummaryHistory[i];
                if (intent == null) {
                    break;
                }
                if (!printed) {
                    if (needSep) {
                        pw.println();
                    }
                    needSep = true;
                    pw.println("  Historical broadcasts summary [" + mQueueName + "]:");
                    printed = true;
                }
                if (!dumpAll && i >= 50) {
                    pw.println("  ...");
                    break;
                }
                pw.print("  #"); pw.print(i); pw.print(": ");
                pw.println(intent.toShortString(false, true, true, false));
                Bundle bundle = intent.getExtras();
                if (bundle != null) {
                    pw.print("    extras: "); pw.println(bundle.toString());
                }
            }
        }

        return needSep;
    }
}