1 /* 2 * Copyright (C) 2008 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.internal.os; 18 19 import android.os.IBinder; 20 import android.os.SystemClock; 21 import android.util.EventLog; 22 23 import java.lang.ref.WeakReference; 24 import java.util.ArrayList; 25 26 /** 27 * Private and debugging Binder APIs. 28 * 29 * @see IBinder 30 */ 31 public class BinderInternal { 32 static WeakReference<GcWatcher> sGcWatcher 33 = new WeakReference<GcWatcher>(new GcWatcher()); 34 static ArrayList<Runnable> sGcWatchers = new ArrayList<>(); 35 static Runnable[] sTmpWatchers = new Runnable[1]; 36 static long sLastGcTime; 37 38 static final class GcWatcher { 39 @Override 40 protected void finalize() throws Throwable { 41 handleGc(); 42 sLastGcTime = SystemClock.uptimeMillis(); 43 synchronized (sGcWatchers) { 44 sTmpWatchers = sGcWatchers.toArray(sTmpWatchers); 45 } 46 for (int i=0; i<sTmpWatchers.length; i++) { 47 if (sTmpWatchers[i] != null) { 48 sTmpWatchers[i].run(); 49 } 50 } 51 sGcWatcher = new WeakReference<GcWatcher>(new GcWatcher()); 52 } 53 } 54 55 public static void addGcWatcher(Runnable watcher) { 56 synchronized (sGcWatchers) { 57 sGcWatchers.add(watcher); 58 } 59 } 60 61 /** 62 * Add the calling thread to the IPC thread pool. This function does 63 * not return until the current process is exiting. 64 */ 65 public static final native void joinThreadPool(); 66 67 /** 68 * Return the system time (as reported by {@link SystemClock#uptimeMillis 69 * SystemClock.uptimeMillis()}) that the last garbage collection occurred 70 * in this process. This is not for general application use, and the 71 * meaning of "when a garbage collection occurred" will change as the 72 * garbage collector evolves. 73 * 74 * @return Returns the time as per {@link SystemClock#uptimeMillis 75 * SystemClock.uptimeMillis()} of the last garbage collection. 76 */ 77 public static long getLastGcTime() { 78 return sLastGcTime; 79 } 80 81 /** 82 * Return the global "context object" of the system. This is usually 83 * an implementation of IServiceManager, which you can use to find 84 * other services. 85 */ 86 public static final native IBinder getContextObject(); 87 88 /** 89 * Special for system process to not allow incoming calls to run at 90 * background scheduling priority. 91 * @hide 92 */ 93 public static final native void disableBackgroundScheduling(boolean disable); 94 95 static native final void handleGc(); 96 97 public static void forceGc(String reason) { 98 EventLog.writeEvent(2741, reason); 99 Runtime.getRuntime().gc(); 100 } 101 102 static void forceBinderGc() { 103 forceGc("Binder"); 104 } 105 } 106