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