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