Set foreground priority for shutdown receivers.

The broadcast of ACTION_SHUTDOWN has a timeout of 10 seconds. To
reduce the risk of hitting the timeout and speeding up the
shutdown sequence in ShutdownThread we set the priority of the
BroadcastReceivers to FLAG_RECEIVER_FOREGROUND.

We have seen that this change reduces the shutdown time when
the system is under heavy load.

Change-Id: I22cbf6af8cf6fc4bdefaa1c3da8a7eed7e7b7674

1 files changed, 3 insertions, 1 deletions

diff --git a/services/java/com/android/server/power/ShutdownThread.java b/services/java/com/android/server/power/ShutdownThread.java
index c7f7390..c084666 100644
--- a/services/java/com/android/server/power/ShutdownThread.java
+++ b/services/java/com/android/server/power/ShutdownThread.java
@@ -297,7 +297,9 @@ public final class ShutdownThread extends Thread {
         
         // First send the high-level shut down broadcast.
         mActionDone = false;
-        mContext.sendOrderedBroadcastAsUser(new Intent(Intent.ACTION_SHUTDOWN),
+        Intent intent = new Intent(Intent.ACTION_SHUTDOWN);
+        intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);
+        mContext.sendOrderedBroadcastAsUser(intent,
                 UserHandle.ALL, null, br, mHandler, 0, null, null);
         
         final long endTime = SystemClock.elapsedRealtime() + MAX_BROADCAST_TIME;