SystemServer.java revision 2992ea782fa61780d8e0de7a36a2a84622f8694b
1/* 2 * Copyright (C) 2006 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 17package com.android.server; 18 19import com.android.server.am.ActivityManagerService; 20import com.android.internal.app.ShutdownThread; 21import com.android.internal.os.BinderInternal; 22import com.android.internal.os.SamplingProfilerIntegration; 23 24import dalvik.system.VMRuntime; 25import dalvik.system.Zygote; 26 27import android.accounts.AccountManagerService; 28import android.app.ActivityManagerNative; 29import android.bluetooth.BluetoothAdapter; 30import android.content.ComponentName; 31import android.content.ContentResolver; 32import android.content.ContentService; 33import android.content.Context; 34import android.content.Intent; 35import android.content.pm.IPackageManager; 36import android.content.res.Configuration; 37import android.database.ContentObserver; 38import android.media.AudioService; 39import android.os.Build; 40import android.os.Looper; 41import android.os.RemoteException; 42import android.os.ServiceManager; 43import android.os.StrictMode; 44import android.os.SystemClock; 45import android.os.SystemProperties; 46import android.provider.Contacts.People; 47import android.provider.Settings; 48import android.server.BluetoothA2dpService; 49import android.server.BluetoothService; 50import android.server.search.SearchManagerService; 51import android.util.DisplayMetrics; 52import android.util.EventLog; 53import android.util.Log; 54import android.util.Slog; 55import android.view.Display; 56import android.view.WindowManager; 57 58import java.io.File; 59import java.util.Timer; 60import java.util.TimerTask; 61 62class ServerThread extends Thread { 63 private static final String TAG = "SystemServer"; 64 65 ContentResolver mContentResolver; 66 67 private class AdbSettingsObserver extends ContentObserver { 68 public AdbSettingsObserver() { 69 super(null); 70 } 71 @Override 72 public void onChange(boolean selfChange) { 73 boolean enableAdb = (Settings.Secure.getInt(mContentResolver, 74 Settings.Secure.ADB_ENABLED, 0) > 0); 75 // setting this secure property will start or stop adbd 76 SystemProperties.set("persist.service.adb.enable", enableAdb ? "1" : "0"); 77 } 78 } 79 80 @Override 81 public void run() { 82 EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_SYSTEM_RUN, 83 SystemClock.uptimeMillis()); 84 85 Looper.prepare(); 86 87 android.os.Process.setThreadPriority( 88 android.os.Process.THREAD_PRIORITY_FOREGROUND); 89 90 BinderInternal.disableBackgroundScheduling(true); 91 android.os.Process.setCanSelfBackground(false); 92 93 // Check whether we failed to shut down last time we tried. 94 { 95 final String shutdownAction = SystemProperties.get( 96 ShutdownThread.SHUTDOWN_ACTION_PROPERTY, ""); 97 if (shutdownAction != null && shutdownAction.length() > 0) { 98 boolean reboot = (shutdownAction.charAt(0) == '1'); 99 100 final String reason; 101 if (shutdownAction.length() > 1) { 102 reason = shutdownAction.substring(1, shutdownAction.length()); 103 } else { 104 reason = null; 105 } 106 107 ShutdownThread.rebootOrShutdown(reboot, reason); 108 } 109 } 110 111 String factoryTestStr = SystemProperties.get("ro.factorytest"); 112 int factoryTest = "".equals(factoryTestStr) ? SystemServer.FACTORY_TEST_OFF 113 : Integer.parseInt(factoryTestStr); 114 115 LightsService lights = null; 116 PowerManagerService power = null; 117 BatteryService battery = null; 118 ConnectivityService connectivity = null; 119 IPackageManager pm = null; 120 Context context = null; 121 WindowManagerService wm = null; 122 BluetoothService bluetooth = null; 123 BluetoothA2dpService bluetoothA2dp = null; 124 WiredAccessoryObserver wiredAccessory = null; 125 DockObserver dock = null; 126 UsbService usb = null; 127 UiModeManagerService uiMode = null; 128 RecognitionManagerService recognition = null; 129 ThrottleService throttle = null; 130 NetworkTimeUpdateService networkTimeUpdater = null; 131 132 // Critical services... 133 try { 134 Slog.i(TAG, "Entropy Service"); 135 ServiceManager.addService("entropy", new EntropyService()); 136 137 Slog.i(TAG, "Power Manager"); 138 power = new PowerManagerService(); 139 ServiceManager.addService(Context.POWER_SERVICE, power); 140 141 Slog.i(TAG, "Activity Manager"); 142 context = ActivityManagerService.main(factoryTest); 143 144 Slog.i(TAG, "Telephony Registry"); 145 ServiceManager.addService("telephony.registry", new TelephonyRegistry(context)); 146 147 AttributeCache.init(context); 148 149 Slog.i(TAG, "Package Manager"); 150 pm = PackageManagerService.main(context, 151 factoryTest != SystemServer.FACTORY_TEST_OFF); 152 153 ActivityManagerService.setSystemProcess(); 154 155 mContentResolver = context.getContentResolver(); 156 157 // The AccountManager must come before the ContentService 158 try { 159 Slog.i(TAG, "Account Manager"); 160 ServiceManager.addService(Context.ACCOUNT_SERVICE, 161 new AccountManagerService(context)); 162 } catch (Throwable e) { 163 Slog.e(TAG, "Failure starting Account Manager", e); 164 } 165 166 Slog.i(TAG, "Content Manager"); 167 ContentService.main(context, 168 factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL); 169 170 Slog.i(TAG, "System Content Providers"); 171 ActivityManagerService.installSystemProviders(); 172 173 Slog.i(TAG, "Lights Service"); 174 lights = new LightsService(context); 175 176 Slog.i(TAG, "Battery Service"); 177 battery = new BatteryService(context, lights); 178 ServiceManager.addService("battery", battery); 179 180 Slog.i(TAG, "Vibrator Service"); 181 ServiceManager.addService("vibrator", new VibratorService(context)); 182 183 // only initialize the power service after we have started the 184 // lights service, content providers and the battery service. 185 power.init(context, lights, ActivityManagerService.getDefault(), battery); 186 187 Slog.i(TAG, "Alarm Manager"); 188 AlarmManagerService alarm = new AlarmManagerService(context); 189 ServiceManager.addService(Context.ALARM_SERVICE, alarm); 190 191 Slog.i(TAG, "Init Watchdog"); 192 Watchdog.getInstance().init(context, battery, power, alarm, 193 ActivityManagerService.self()); 194 195 Slog.i(TAG, "Window Manager"); 196 wm = WindowManagerService.main(context, power, 197 factoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL); 198 ServiceManager.addService(Context.WINDOW_SERVICE, wm); 199 200 ((ActivityManagerService)ServiceManager.getService("activity")) 201 .setWindowManager(wm); 202 203 // Skip Bluetooth if we have an emulator kernel 204 // TODO: Use a more reliable check to see if this product should 205 // support Bluetooth - see bug 988521 206 if (SystemProperties.get("ro.kernel.qemu").equals("1")) { 207 Slog.i(TAG, "No Bluetooh Service (emulator)"); 208 } else if (factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL) { 209 Slog.i(TAG, "No Bluetooth Service (factory test)"); 210 } else { 211 Slog.i(TAG, "Bluetooth Service"); 212 bluetooth = new BluetoothService(context); 213 ServiceManager.addService(BluetoothAdapter.BLUETOOTH_SERVICE, bluetooth); 214 bluetooth.initAfterRegistration(); 215 bluetoothA2dp = new BluetoothA2dpService(context, bluetooth); 216 ServiceManager.addService(BluetoothA2dpService.BLUETOOTH_A2DP_SERVICE, 217 bluetoothA2dp); 218 bluetooth.initAfterA2dpRegistration(); 219 220 int bluetoothOn = Settings.Secure.getInt(mContentResolver, 221 Settings.Secure.BLUETOOTH_ON, 0); 222 if (bluetoothOn > 0) { 223 bluetooth.enable(); 224 } 225 } 226 227 } catch (RuntimeException e) { 228 Slog.e("System", "Failure starting core service", e); 229 } 230 231 DevicePolicyManagerService devicePolicy = null; 232 StatusBarManagerService statusBar = null; 233 InputMethodManagerService imm = null; 234 AppWidgetService appWidget = null; 235 NotificationManagerService notification = null; 236 WallpaperManagerService wallpaper = null; 237 LocationManagerService location = null; 238 CountryDetectorService countryDetector = null; 239 240 if (factoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL) { 241 try { 242 Slog.i(TAG, "Device Policy"); 243 devicePolicy = new DevicePolicyManagerService(context); 244 ServiceManager.addService(Context.DEVICE_POLICY_SERVICE, devicePolicy); 245 } catch (Throwable e) { 246 Slog.e(TAG, "Failure starting DevicePolicyService", e); 247 } 248 249 try { 250 Slog.i(TAG, "Status Bar"); 251 statusBar = new StatusBarManagerService(context, wm); 252 ServiceManager.addService(Context.STATUS_BAR_SERVICE, statusBar); 253 } catch (Throwable e) { 254 Slog.e(TAG, "Failure starting StatusBarManagerService", e); 255 } 256 257 try { 258 Slog.i(TAG, "Clipboard Service"); 259 ServiceManager.addService(Context.CLIPBOARD_SERVICE, 260 new ClipboardService(context)); 261 } catch (Throwable e) { 262 Slog.e(TAG, "Failure starting Clipboard Service", e); 263 } 264 265 try { 266 Slog.i(TAG, "Input Method Service"); 267 imm = new InputMethodManagerService(context, statusBar); 268 ServiceManager.addService(Context.INPUT_METHOD_SERVICE, imm); 269 } catch (Throwable e) { 270 Slog.e(TAG, "Failure starting Input Manager Service", e); 271 } 272 273 try { 274 Slog.i(TAG, "NetStat Service"); 275 ServiceManager.addService("netstat", new NetStatService(context)); 276 } catch (Throwable e) { 277 Slog.e(TAG, "Failure starting NetStat Service", e); 278 } 279 280 try { 281 Slog.i(TAG, "NetworkManagement Service"); 282 ServiceManager.addService( 283 Context.NETWORKMANAGEMENT_SERVICE, 284 NetworkManagementService.create(context)); 285 } catch (Throwable e) { 286 Slog.e(TAG, "Failure starting NetworkManagement Service", e); 287 } 288 289 try { 290 Slog.i(TAG, "Connectivity Service"); 291 connectivity = ConnectivityService.getInstance(context); 292 ServiceManager.addService(Context.CONNECTIVITY_SERVICE, connectivity); 293 } catch (Throwable e) { 294 Slog.e(TAG, "Failure starting Connectivity Service", e); 295 } 296 297 try { 298 Slog.i(TAG, "Throttle Service"); 299 throttle = new ThrottleService(context); 300 ServiceManager.addService( 301 Context.THROTTLE_SERVICE, throttle); 302 } catch (Throwable e) { 303 Slog.e(TAG, "Failure starting ThrottleService", e); 304 } 305 306 try { 307 Slog.i(TAG, "Accessibility Manager"); 308 ServiceManager.addService(Context.ACCESSIBILITY_SERVICE, 309 new AccessibilityManagerService(context)); 310 } catch (Throwable e) { 311 Slog.e(TAG, "Failure starting Accessibility Manager", e); 312 } 313 314 try { 315 /* 316 * NotificationManagerService is dependant on MountService, 317 * (for media / usb notifications) so we must start MountService first. 318 */ 319 Slog.i(TAG, "Mount Service"); 320 ServiceManager.addService("mount", new MountService(context)); 321 } catch (Throwable e) { 322 Slog.e(TAG, "Failure starting Mount Service", e); 323 } 324 325 try { 326 Slog.i(TAG, "Notification Manager"); 327 notification = new NotificationManagerService(context, statusBar, lights); 328 ServiceManager.addService(Context.NOTIFICATION_SERVICE, notification); 329 } catch (Throwable e) { 330 Slog.e(TAG, "Failure starting Notification Manager", e); 331 } 332 333 try { 334 Slog.i(TAG, "Device Storage Monitor"); 335 ServiceManager.addService(DeviceStorageMonitorService.SERVICE, 336 new DeviceStorageMonitorService(context)); 337 } catch (Throwable e) { 338 Slog.e(TAG, "Failure starting DeviceStorageMonitor service", e); 339 } 340 341 try { 342 Slog.i(TAG, "Location Manager"); 343 location = new LocationManagerService(context); 344 ServiceManager.addService(Context.LOCATION_SERVICE, location); 345 } catch (Throwable e) { 346 Slog.e(TAG, "Failure starting Location Manager", e); 347 } 348 349 try { 350 Slog.i(TAG, "Country Detector"); 351 countryDetector = new CountryDetectorService(context); 352 ServiceManager.addService(Context.COUNTRY_DETECTOR, countryDetector); 353 } catch (Throwable e) { 354 Slog.e(TAG, "Failure starting Country Detector", e); 355 } 356 357 try { 358 Slog.i(TAG, "Search Service"); 359 ServiceManager.addService(Context.SEARCH_SERVICE, 360 new SearchManagerService(context)); 361 } catch (Throwable e) { 362 Slog.e(TAG, "Failure starting Search Service", e); 363 } 364 365 try { 366 Slog.i(TAG, "DropBox Service"); 367 ServiceManager.addService(Context.DROPBOX_SERVICE, 368 new DropBoxManagerService(context, new File("/data/system/dropbox"))); 369 } catch (Throwable e) { 370 Slog.e(TAG, "Failure starting DropBoxManagerService", e); 371 } 372 373 try { 374 Slog.i(TAG, "Wallpaper Service"); 375 wallpaper = new WallpaperManagerService(context); 376 ServiceManager.addService(Context.WALLPAPER_SERVICE, wallpaper); 377 } catch (Throwable e) { 378 Slog.e(TAG, "Failure starting Wallpaper Service", e); 379 } 380 381 try { 382 Slog.i(TAG, "Audio Service"); 383 ServiceManager.addService(Context.AUDIO_SERVICE, new AudioService(context)); 384 } catch (Throwable e) { 385 Slog.e(TAG, "Failure starting Audio Service", e); 386 } 387 388 try { 389 Slog.i(TAG, "Dock Observer"); 390 // Listen for dock station changes 391 dock = new DockObserver(context, power); 392 } catch (Throwable e) { 393 Slog.e(TAG, "Failure starting DockObserver", e); 394 } 395 396 try { 397 Slog.i(TAG, "Wired Accessory Observer"); 398 // Listen for wired headset changes 399 wiredAccessory = new WiredAccessoryObserver(context); 400 } catch (Throwable e) { 401 Slog.e(TAG, "Failure starting WiredAccessoryObserver", e); 402 } 403 404 try { 405 Slog.i(TAG, "USB Observer"); 406 // Listen for USB changes 407 usb = new UsbService(context); 408 } catch (Throwable e) { 409 Slog.e(TAG, "Failure starting UsbService", e); 410 } 411 412 try { 413 Slog.i(TAG, "UI Mode Manager Service"); 414 // Listen for UI mode changes 415 uiMode = new UiModeManagerService(context); 416 } catch (Throwable e) { 417 Slog.e(TAG, "Failure starting UiModeManagerService", e); 418 } 419 420 try { 421 Slog.i(TAG, "Backup Service"); 422 ServiceManager.addService(Context.BACKUP_SERVICE, 423 new BackupManagerService(context)); 424 } catch (Throwable e) { 425 Slog.e(TAG, "Failure starting Backup Service", e); 426 } 427 428 try { 429 Slog.i(TAG, "AppWidget Service"); 430 appWidget = new AppWidgetService(context); 431 ServiceManager.addService(Context.APPWIDGET_SERVICE, appWidget); 432 } catch (Throwable e) { 433 Slog.e(TAG, "Failure starting AppWidget Service", e); 434 } 435 436 try { 437 Slog.i(TAG, "Recognition Service"); 438 recognition = new RecognitionManagerService(context); 439 } catch (Throwable e) { 440 Slog.e(TAG, "Failure starting Recognition Service", e); 441 } 442 443 try { 444 Slog.i(TAG, "DiskStats Service"); 445 ServiceManager.addService("diskstats", new DiskStatsService(context)); 446 } catch (Throwable e) { 447 Slog.e(TAG, "Failure starting DiskStats Service", e); 448 } 449 450 try { 451 // need to add this service even if SamplingProfilerIntegration.isEnabled() 452 // is false, because it is this service that detects system property change and 453 // turns on SamplingProfilerIntegration. Plus, when sampling profiler doesn't work, 454 // there is little overhead for running this service. 455 Slog.i(TAG, "SamplingProfiler Service"); 456 ServiceManager.addService("samplingprofiler", 457 new SamplingProfilerService(context)); 458 } catch (Throwable e) { 459 Slog.e(TAG, "Failure starting SamplingProfiler Service", e); 460 } 461 462 try { 463 Slog.i(TAG, "NetworkTimeUpdateService"); 464 networkTimeUpdater = new NetworkTimeUpdateService(context); 465 } catch (Throwable e) { 466 Slog.e(TAG, "Failure starting NetworkTimeUpdate service"); 467 } 468 } 469 470 // make sure the ADB_ENABLED setting value matches the secure property value 471 Settings.Secure.putInt(mContentResolver, Settings.Secure.ADB_ENABLED, 472 "1".equals(SystemProperties.get("persist.service.adb.enable")) ? 1 : 0); 473 474 // register observer to listen for settings changes 475 mContentResolver.registerContentObserver(Settings.Secure.getUriFor(Settings.Secure.ADB_ENABLED), 476 false, new AdbSettingsObserver()); 477 478 // Before things start rolling, be sure we have decided whether 479 // we are in safe mode. 480 final boolean safeMode = wm.detectSafeMode(); 481 if (safeMode) { 482 ActivityManagerService.self().enterSafeMode(); 483 // Post the safe mode state in the Zygote class 484 Zygote.systemInSafeMode = true; 485 // Disable the JIT for the system_server process 486 VMRuntime.getRuntime().disableJitCompilation(); 487 } else { 488 // Enable the JIT for the system_server process 489 VMRuntime.getRuntime().startJitCompilation(); 490 } 491 492 // It is now time to start up the app processes... 493 494 if (devicePolicy != null) { 495 devicePolicy.systemReady(); 496 } 497 498 if (notification != null) { 499 notification.systemReady(); 500 } 501 502 wm.systemReady(); 503 504 if (safeMode) { 505 ActivityManagerService.self().showSafeModeOverlay(); 506 } 507 508 // Update the configuration for this context by hand, because we're going 509 // to start using it before the config change done in wm.systemReady() will 510 // propagate to it. 511 Configuration config = wm.computeNewConfiguration(); 512 DisplayMetrics metrics = new DisplayMetrics(); 513 WindowManager w = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE); 514 w.getDefaultDisplay().getMetrics(metrics); 515 context.getResources().updateConfiguration(config, metrics); 516 517 power.systemReady(); 518 try { 519 pm.systemReady(); 520 } catch (RemoteException e) { 521 } 522 523 // These are needed to propagate to the runnable below. 524 final Context contextF = context; 525 final BatteryService batteryF = battery; 526 final ConnectivityService connectivityF = connectivity; 527 final DockObserver dockF = dock; 528 final UsbService usbF = usb; 529 final ThrottleService throttleF = throttle; 530 final UiModeManagerService uiModeF = uiMode; 531 final AppWidgetService appWidgetF = appWidget; 532 final WallpaperManagerService wallpaperF = wallpaper; 533 final InputMethodManagerService immF = imm; 534 final RecognitionManagerService recognitionF = recognition; 535 final LocationManagerService locationF = location; 536 final CountryDetectorService countryDetectorF = countryDetector; 537 final NetworkTimeUpdateService networkTimeUpdaterF = networkTimeUpdater; 538 539 // We now tell the activity manager it is okay to run third party 540 // code. It will call back into us once it has gotten to the state 541 // where third party code can really run (but before it has actually 542 // started launching the initial applications), for us to complete our 543 // initialization. 544 ((ActivityManagerService)ActivityManagerNative.getDefault()) 545 .systemReady(new Runnable() { 546 public void run() { 547 Slog.i(TAG, "Making services ready"); 548 549 startSystemUi(contextF); 550 if (batteryF != null) batteryF.systemReady(); 551 if (connectivityF != null) connectivityF.systemReady(); 552 if (dockF != null) dockF.systemReady(); 553 if (usbF != null) usbF.systemReady(); 554 if (uiModeF != null) uiModeF.systemReady(); 555 if (recognitionF != null) recognitionF.systemReady(); 556 Watchdog.getInstance().start(); 557 558 // It is now okay to let the various system services start their 559 // third party code... 560 561 if (appWidgetF != null) appWidgetF.systemReady(safeMode); 562 if (wallpaperF != null) wallpaperF.systemReady(); 563 if (immF != null) immF.systemReady(); 564 if (locationF != null) locationF.systemReady(); 565 if (countryDetectorF != null) countryDetectorF.systemReady(); 566 if (throttleF != null) throttleF.systemReady(); 567 if (networkTimeUpdaterF != null) networkTimeUpdaterF.systemReady(); 568 } 569 }); 570 571 // For debug builds, log event loop stalls to dropbox for analysis. 572 if (StrictMode.conditionallyEnableDebugLogging()) { 573 Slog.i(TAG, "Enabled StrictMode for system server main thread."); 574 } 575 576 Looper.loop(); 577 Slog.d(TAG, "System ServerThread is exiting!"); 578 } 579 580 static final void startSystemUi(Context context) { 581 Intent intent = new Intent(); 582 intent.setComponent(new ComponentName("com.android.systemui", 583 "com.android.systemui.SystemUIService")); 584 Slog.d(TAG, "Starting service: " + intent); 585 context.startService(intent); 586 } 587} 588 589public class SystemServer { 590 private static final String TAG = "SystemServer"; 591 592 public static final int FACTORY_TEST_OFF = 0; 593 public static final int FACTORY_TEST_LOW_LEVEL = 1; 594 public static final int FACTORY_TEST_HIGH_LEVEL = 2; 595 596 static Timer timer; 597 static final long SNAPSHOT_INTERVAL = 60 * 60 * 1000; // 1hr 598 599 // The earliest supported time. We pick one day into 1970, to 600 // give any timezone code room without going into negative time. 601 private static final long EARLIEST_SUPPORTED_TIME = 86400 * 1000; 602 603 /** 604 * This method is called from Zygote to initialize the system. This will cause the native 605 * services (SurfaceFlinger, AudioFlinger, etc..) to be started. After that it will call back 606 * up into init2() to start the Android services. 607 */ 608 native public static void init1(String[] args); 609 610 public static void main(String[] args) { 611 if (System.currentTimeMillis() < EARLIEST_SUPPORTED_TIME) { 612 // If a device's clock is before 1970 (before 0), a lot of 613 // APIs crash dealing with negative numbers, notably 614 // java.io.File#setLastModified, so instead we fake it and 615 // hope that time from cell towers or NTP fixes it 616 // shortly. 617 Slog.w(TAG, "System clock is before 1970; setting to 1970."); 618 SystemClock.setCurrentTimeMillis(EARLIEST_SUPPORTED_TIME); 619 } 620 621 if (SamplingProfilerIntegration.isEnabled()) { 622 SamplingProfilerIntegration.start(); 623 timer = new Timer(); 624 timer.schedule(new TimerTask() { 625 @Override 626 public void run() { 627 SamplingProfilerIntegration.writeSnapshot("system_server", null); 628 } 629 }, SNAPSHOT_INTERVAL, SNAPSHOT_INTERVAL); 630 } 631 632 // The system server has to run all of the time, so it needs to be 633 // as efficient as possible with its memory usage. 634 VMRuntime.getRuntime().setTargetHeapUtilization(0.8f); 635 636 System.loadLibrary("android_servers"); 637 init1(args); 638 } 639 640 public static final void init2() { 641 Slog.i(TAG, "Entered the Android system server!"); 642 Thread thr = new ServerThread(); 643 thr.setName("android.server.ServerThread"); 644 thr.start(); 645 } 646} 647