Inform Application thread to block for network rules to be updated.

Bug: 226299593
Test: atest tests/cts/hostside/src/com/android/cts/net/HostsideRestrictBackgroundNetworkTests.java
Change-Id: Ie37173d0d3f4034a74b834550920530166cd4201
Merged-In: Ie37173d0d3f4034a74b834550920530166cd4201

core/java/android/app/ActivityManagerInternal.java

@@ -587,7 +587,7 @@ public abstract class ActivityManagerInternal {
      * @param uid uid
      * @param pid pid of the ProcessRecord that is pending top.
      */
-    public abstract void addPendingTopUid(int uid, int pid);
+    public abstract void addPendingTopUid(int uid, int pid, @Nullable IApplicationThread thread);
 
     /**
      * Delete uid from the ActivityManagerService PendingStartActivityUids list.

services/core/java/com/android/server/am/ActivityManagerService.java

@@ -16315,20 +16315,36 @@ public class ActivityManagerService extends IActivityManager.Stub
         }
 
         @Override
-        public void addPendingTopUid(int uid, int pid) {
+        public void addPendingTopUid(int uid, int pid, @Nullable IApplicationThread thread) {
-            mPendingStartActivityUids.add(uid, pid);
+            final boolean isNewPending = mPendingStartActivityUids.add(uid, pid);
             // We need to update the network rules for the app coming to the top state so that
             // it can access network when the device or the app is in a restricted state
             // (e.g. battery/data saver) but since waiting for updateOomAdj to complete and then
             // informing NetworkPolicyManager might get delayed, informing the state change as soon
             // as we know app is going to come to the top state.
-            if (mNetworkPolicyUidObserver != null) {
+            if (isNewPending && mNetworkPolicyUidObserver != null) {
                 try {
+                    final long procStateSeq = mProcessList.getNextProcStateSeq();
                     mNetworkPolicyUidObserver.onUidStateChanged(uid, PROCESS_STATE_TOP,
-                            mProcessList.getNextProcStateSeq(), PROCESS_CAPABILITY_ALL);
+                            procStateSeq, PROCESS_CAPABILITY_ALL);
-                } catch (RemoteException e) {
+                    if (thread != null && isNetworkingBlockedForUid(uid)) {
-                    // Should not happen; call is within the same process
+                        thread.setNetworkBlockSeq(procStateSeq);
                     }
+                } catch (RemoteException e) {
+                    Slog.d(TAG, "Error calling setNetworkBlockSeq", e);
+                }
+            }
+        }
+
+        private boolean isNetworkingBlockedForUid(int uid) {
+            synchronized (mUidNetworkBlockedReasons) {
+                // TODO: We can consider only those blocked reasons that will be overridden
+                // by the TOP state. For other ones, there is no point in waiting.
+                // TODO: We can reuse this data in
+                // ProcessList#incrementProcStateSeqAndNotifyAppsLOSP instead of calling into
+                // NetworkManagementService.
+                return mUidNetworkBlockedReasons.get(uid, BLOCKED_REASON_NONE)
+                        != BLOCKED_REASON_NONE;
             }
         }
 

services/core/java/com/android/server/am/PendingStartActivityUids.java

@@ -44,10 +44,12 @@ final class PendingStartActivityUids {
         mContext = context;
     }
 
-    synchronized void add(int uid, int pid) {
+    synchronized boolean add(int uid, int pid) {
         if (mPendingUids.get(uid) == null) {
             mPendingUids.put(uid, new Pair<>(pid, SystemClock.elapsedRealtime()));
+            return true;
         }
+        return false;
     }
 
     synchronized void delete(int uid, long nowElapsed) {

services/core/java/com/android/server/wm/WindowProcessController.java

@@ -1123,7 +1123,7 @@ public class WindowProcessController extends ConfigurationContainer<Configuratio
 
     /** Makes the process have top state before oom-adj is computed from a posted message. */
     void addToPendingTop() {
-        mAtm.mAmInternal.addPendingTopUid(mUid, mPid);
+        mAtm.mAmInternal.addPendingTopUid(mUid, mPid, mThread);
     }
 
     void updateServiceConnectionActivities() {
@@ -1176,7 +1176,7 @@ public class WindowProcessController extends ConfigurationContainer<Configuratio
         }
         // update ActivityManagerService.PendingStartActivityUids list.
         if (topProcessState == ActivityManager.PROCESS_STATE_TOP) {
-            mAtm.mAmInternal.addPendingTopUid(mUid, mPid);
+            mAtm.mAmInternal.addPendingTopUid(mUid, mPid, mThread);
         }
         prepareOomAdjustment();
         // Posting the message at the front of queue so WM lock isn't held when we call into AM,