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      1 /*
      2  * Copyright (C) 2010 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 android.os;
     18 
     19 import android.content.ComponentName;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.ServiceConnection;
     23 import android.test.AndroidTestCase;
     24 import android.test.suitebuilder.annotation.MediumTest;
     25 import android.util.Log;
     26 
     27 import java.io.File;
     28 import java.io.IOException;
     29 
     30 /**
     31  * Test whether Binder calls inherit thread priorities correctly.
     32  */
     33 public class BinderThreadPriorityTest extends AndroidTestCase {
     34     private static final String TAG = "BinderThreadPriorityTest";
     35     private IBinderThreadPriorityService mService;
     36     private int mSavedPriority;
     37 
     38     private ServiceConnection mConnection = new ServiceConnection() {
     39         public void onServiceConnected(ComponentName name, IBinder service) {
     40             synchronized (BinderThreadPriorityTest.this) {
     41                 mService = IBinderThreadPriorityService.Stub.asInterface(service);
     42                 BinderThreadPriorityTest.this.notifyAll();
     43             }
     44         }
     45 
     46         public void onServiceDisconnected(ComponentName name) {
     47             mService = null;
     48         }
     49     };
     50 
     51     private static class ServiceStub extends IBinderThreadPriorityService.Stub {
     52         public int getThreadPriority() { fail(); return -999; }
     53         public String getThreadSchedulerGroup() { fail(); return null; }
     54         public void setPriorityAndCallBack(int p, IBinderThreadPriorityService cb) { fail(); }
     55         public void callBack(IBinderThreadPriorityService cb) { fail(); }
     56         private static void fail() { throw new RuntimeException("unimplemented"); }
     57     }
     58 
     59     @Override
     60     protected void setUp() throws Exception {
     61         super.setUp();
     62 
     63         getContext().bindService(
     64                 new Intent(getContext(), BinderThreadPriorityService.class),
     65                 mConnection, Context.BIND_AUTO_CREATE);
     66 
     67         synchronized (this) {
     68             if (mService == null) {
     69                 try {
     70                     wait(30000);
     71                 } catch (InterruptedException e) {
     72                     throw new RuntimeException(e);
     73                 }
     74                 assertNotNull("Gave up waiting for BinderThreadPriorityService", mService);
     75             }
     76         }
     77 
     78         mSavedPriority = Process.getThreadPriority(Process.myTid());
     79         Process.setThreadPriority(mSavedPriority);  // To realign priority & cgroup, if needed
     80         assertEquals(expectedSchedulerGroup(mSavedPriority), getSchedulerGroup());
     81         Log.i(TAG, "Saved priority: " + mSavedPriority);
     82     }
     83 
     84     @Override
     85     protected void tearDown() throws Exception {
     86         // HACK -- see bug 2665914 -- setThreadPriority() doesn't always set the
     87         // scheduler group reliably unless we start out with background priority.
     88         Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
     89         Process.setThreadPriority(mSavedPriority);
     90         assertEquals(mSavedPriority, Process.getThreadPriority(Process.myTid()));
     91         assertEquals(expectedSchedulerGroup(mSavedPriority), getSchedulerGroup());
     92 
     93         getContext().unbindService(mConnection);
     94         super.tearDown();
     95     }
     96 
     97     public static String getSchedulerGroup() {
     98         String fn = "/proc/" + Process.myPid() + "/task/" + Process.myTid() + "/cgroup";
     99         try {
    100             String cgroup = FileUtils.readTextFile(new File(fn), 1024, null);
    101             for (String line : cgroup.split("\n")) {
    102                 String fields[] = line.trim().split(":");
    103                     if (fields.length == 3 && fields[1].equals("cpu")) return fields[2];
    104             }
    105         } catch (IOException e) {
    106             Log.e(TAG, "Can't read: " + fn, e);
    107         }
    108         return null;  // Unknown
    109     }
    110 
    111     public static String expectedSchedulerGroup(int prio) {
    112         return prio < Process.THREAD_PRIORITY_BACKGROUND ? "/" : "/bg_non_interactive";
    113     }
    114 
    115     public void testPassPriorityToService() throws Exception {
    116         for (int prio = 19; prio >= -20; prio--) {
    117             Process.setThreadPriority(prio);
    118 
    119             // Local
    120             assertEquals(prio, Process.getThreadPriority(Process.myTid()));
    121             assertEquals(expectedSchedulerGroup(prio), getSchedulerGroup());
    122 
    123             // Remote
    124             assertEquals(prio, mService.getThreadPriority());
    125             assertEquals(expectedSchedulerGroup(prio), mService.getThreadSchedulerGroup());
    126         }
    127     }
    128 
    129     public void testCallBackFromServiceWithPriority() throws Exception {
    130         for (int prio = -20; prio <= 19; prio++) {
    131             final int expected = prio;
    132             mService.setPriorityAndCallBack(prio, new ServiceStub() {
    133                 public void callBack(IBinderThreadPriorityService cb) {
    134                     assertEquals(expected, Process.getThreadPriority(Process.myTid()));
    135                     assertEquals(expectedSchedulerGroup(expected), getSchedulerGroup());
    136                 }
    137             });
    138 
    139             assertEquals(mSavedPriority, Process.getThreadPriority(Process.myTid()));
    140 
    141             // BROKEN -- see bug 2665954 -- scheduler group doesn't get reset
    142             // properly after a back-call with a different priority.
    143             // assertEquals(expectedSchedulerGroup(mSavedPriority), getSchedulerGroup());
    144         }
    145     }
    146 }
    147