1 /*
2  * Copyright (C) 2019 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.server.wm;
18 
19 import static android.app.ActivityManager.PROCESS_STATE_NONEXISTENT;
20 
21 import android.util.SparseIntArray;
22 
23 /**
24  * This is a partial mirror of {@link @com.android.server.am.ActiveUids}. It is already thread
25  * safe so the heavy service lock is not needed when updating state from activity manager (oom
26  * adjustment) or getting state from window manager (background start check).
27  */
28 class MirrorActiveUids {
29     private SparseIntArray mUidStates = new SparseIntArray();
30 
onUidActive(int uid, int procState)31     synchronized void onUidActive(int uid, int procState) {
32         mUidStates.put(uid, procState);
33     }
34 
onUidInactive(int uid)35     synchronized void onUidInactive(int uid) {
36         mUidStates.delete(uid);
37     }
38 
onActiveUidsCleared()39     synchronized void onActiveUidsCleared() {
40         mUidStates.clear();
41     }
42 
onUidProcStateChanged(int uid, int procState)43     synchronized void onUidProcStateChanged(int uid, int procState) {
44         final int index = mUidStates.indexOfKey(uid);
45         if (index >= 0) {
46             mUidStates.setValueAt(index, procState);
47         }
48     }
49 
getUidState(int uid)50     synchronized int getUidState(int uid) {
51         return mUidStates.get(uid, PROCESS_STATE_NONEXISTENT);
52     }
53 }
54