1 /*
2  * Copyright (C) 2017 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.os.Process.THREAD_PRIORITY_DISPLAY;
20 import static android.os.Process.myTid;
21 import static android.os.Process.setThreadPriority;
22 
23 import static com.android.server.LockGuard.INDEX_WINDOW;
24 import static com.android.server.am.ActivityManagerService.TOP_APP_PRIORITY_BOOST;
25 
26 import com.android.internal.annotations.GuardedBy;
27 import com.android.server.AnimationThread;
28 import com.android.server.ThreadPriorityBooster;
29 
30 /**
31  * Window manager version of {@link ThreadPriorityBooster} that boosts even more during app
32  * transitions.
33  */
34 class WindowManagerThreadPriorityBooster extends ThreadPriorityBooster {
35 
36     private final Object mLock = new Object();
37 
38     private final int mAnimationThreadId;
39     private final int mSurfaceAnimationThreadId;
40 
41     @GuardedBy("mLock")
42     private boolean mAppTransitionRunning;
43     @GuardedBy("mLock")
44     private boolean mBoundsAnimationRunning;
45 
WindowManagerThreadPriorityBooster()46     WindowManagerThreadPriorityBooster() {
47         super(THREAD_PRIORITY_DISPLAY, INDEX_WINDOW);
48         mAnimationThreadId = AnimationThread.get().getThreadId();
49         mSurfaceAnimationThreadId = SurfaceAnimationThread.get().getThreadId();
50     }
51 
52     @Override
boost()53     public void boost() {
54 
55         // Do not boost the animation threads. As the animation threads are changing priorities,
56         // boosting it might mess up the priority because we reset it the the previous priority.
57         final int myTid = myTid();
58         if (myTid == mAnimationThreadId || myTid == mSurfaceAnimationThreadId) {
59             return;
60         }
61         super.boost();
62     }
63 
64     @Override
reset()65     public void reset() {
66 
67         // See comment in boost().
68         final int myTid = myTid();
69         if (myTid == mAnimationThreadId || myTid == mSurfaceAnimationThreadId) {
70             return;
71         }
72         super.reset();
73     }
74 
setAppTransitionRunning(boolean running)75     void setAppTransitionRunning(boolean running) {
76         synchronized (mLock) {
77             if (mAppTransitionRunning != running) {
78                 mAppTransitionRunning = running;
79                 updatePriorityLocked();
80             }
81         }
82     }
83 
setBoundsAnimationRunning(boolean running)84     void setBoundsAnimationRunning(boolean running) {
85         synchronized (mLock) {
86             if (mBoundsAnimationRunning != running) {
87                 mBoundsAnimationRunning = running;
88                 updatePriorityLocked();
89             }
90         }
91     }
92 
93     @GuardedBy("mLock")
updatePriorityLocked()94     private void updatePriorityLocked() {
95         int priority = (mAppTransitionRunning || mBoundsAnimationRunning)
96                 ? TOP_APP_PRIORITY_BOOST : THREAD_PRIORITY_DISPLAY;
97         setBoostToPriority(priority);
98         setThreadPriority(mAnimationThreadId, priority);
99         setThreadPriority(mSurfaceAnimationThreadId, priority);
100     }
101 }
102