Home | History | Annotate | Download | only in wm 
      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 
     40     @GuardedBy("mLock")
     41     private boolean mAppTransitionRunning;
     42     @GuardedBy("mLock")
     43     private boolean mBoundsAnimationRunning;
     44 
     45     WindowManagerThreadPriorityBooster() {
     46         super(THREAD_PRIORITY_DISPLAY, INDEX_WINDOW);
     47         mAnimationThreadId = AnimationThread.get().getThreadId();
     48     }
     49 
     50     @Override
     51     public void boost() {
     52 
     53         // Do not boost the animation thread. As the animation thread is changing priorities,
     54         // boosting it might mess up the priority because we reset it the the previous priority.
     55         if (myTid() == mAnimationThreadId) {
     56             return;
     57         }
     58         super.boost();
     59     }
     60 
     61     @Override
     62     public void reset() {
     63 
     64         // See comment in boost().
     65         if (myTid() == mAnimationThreadId) {
     66             return;
     67         }
     68         super.reset();
     69     }
     70 
     71     void setAppTransitionRunning(boolean running) {
     72         synchronized (mLock) {
     73             if (mAppTransitionRunning != running) {
     74                 mAppTransitionRunning = running;
     75                 updatePriorityLocked();
     76             }
     77         }
     78     }
     79 
     80     void setBoundsAnimationRunning(boolean running) {
     81         synchronized (mLock) {
     82             if (mBoundsAnimationRunning != running) {
     83                 mBoundsAnimationRunning = running;
     84                 updatePriorityLocked();
     85             }
     86         }
     87     }
     88 
     89     @GuardedBy("mLock")
     90     private void updatePriorityLocked() {
     91         int priority = (mAppTransitionRunning || mBoundsAnimationRunning)
     92                 ? TOP_APP_PRIORITY_BOOST : THREAD_PRIORITY_DISPLAY;
     93         setBoostToPriority(priority);
     94         setThreadPriority(mAnimationThreadId, priority);
     95     }
     96 }
     97