Start combining threads in system process.

This introduces four generic thread that services can
use in the system process:

- Background: part of the framework for all processes, for
work that is purely background (no timing constraint).
- UI: for time-critical display of UI.
- Foreground: normal foreground work.
- IO: performing IO operations.

I went through and moved services into these threads in the
places I felt relatively comfortable about understanding what
they are doing.  There are still a bunch more we need to look
at -- lots of networking stuff left, 3 or so different native
daemon connectors which I didn't know how much would block,
audio stuff, etc.

Also updated Watchdog to be aware of and check these new
threads, with a new API for other threads to also participate
in this checking.

Change-Id: Ie2f11061cebde5f018d7383b3a910fbbd11d5e11

1 files changed, 2 insertions, 5 deletions

diff --git a/services/java/com/android/server/net/NetworkPolicyManagerService.java b/services/java/com/android/server/net/NetworkPolicyManagerService.java
index a82f421..5ca7242 100644
--- a/services/java/com/android/server/net/NetworkPolicyManagerService.java
+++ b/services/java/com/android/server/net/NetworkPolicyManagerService.java
@@ -106,7 +106,6 @@ import android.net.wifi.WifiManager;
 import android.os.Binder;
 import android.os.Environment;
 import android.os.Handler;
-import android.os.HandlerThread;
 import android.os.INetworkManagementService;
 import android.os.IPowerManager;
 import android.os.Message;
@@ -134,6 +133,7 @@ import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.util.FastXmlSerializer;
 import com.android.internal.util.IndentingPrintWriter;
 import com.android.internal.util.Objects;
+import com.android.server.IoThread;
 import com.google.android.collect.Lists;
 import com.google.android.collect.Maps;
 import com.google.android.collect.Sets;
@@ -274,7 +274,6 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
     private final RemoteCallbackList<INetworkPolicyListener> mListeners = new RemoteCallbackList<
             INetworkPolicyListener>();
 
-    private final HandlerThread mHandlerThread;
     private final Handler mHandler;
 
     private final AtomicFile mPolicyFile;
@@ -306,9 +305,7 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
         mNetworkManager = checkNotNull(networkManagement, "missing networkManagement");
         mTime = checkNotNull(time, "missing TrustedTime");
 
-        mHandlerThread = new HandlerThread(TAG);
-        mHandlerThread.start();
-        mHandler = new Handler(mHandlerThread.getLooper(), mHandlerCallback);
+        mHandler = new Handler(IoThread.get().getLooper(), mHandlerCallback);
 
         mSuppressDefaultPolicy = suppressDefaultPolicy;