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      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
     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      */
     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      */
     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      */
     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      */
     83     public static final native void disableBackgroundScheduling(boolean disable);
     84 
     85     static native final void handleGc();
     86 
     87     public static void forceGc(String reason) {
     88         EventLog.writeEvent(2741, reason);
     89         Runtime.getRuntime().gc();
     90     }
     91 
     92     static void forceBinderGc() {
     93         forceGc("Binder");
     94     }
     95 }
     96