Android启动续-------SystemSever启动
Android启动续-------SystemSever启动
诚如上一篇，我们说到Zygote的启动，我们可以看到
目录（/android/4.4/frameworks/base/core/java/com/android/internal/os/ZygoteInit.java)
public class ZygoteInit {
public static void main(String argv[]) {
try {
// Start profiling the zygote initialization.
SamplingProfilerIntegration.start();
registerZygoteSocket();
EventLog.writeEvent(LOG_BOOT_PROGRESS_PRELOAD_START,
SystemClock.uptimeMillis());
preload();
EventLog.writeEvent(LOG_BOOT_PROGRESS_PRELOAD_END,
SystemClock.uptimeMillis());
// Finish profiling the zygote initialization.
SamplingProfilerIntegration.writeZygoteSnapshot();
// Do an initial gc to clean up after startup
gc();
// Disable tracing so that forked processes do not inherit stale tracing tags from
// Zygote.
Trace.setTracingEnabled(false);
// If requested, start system server directly from Zygote
if (argv.length != 2) {
throw new RuntimeException(argv[0] + USAGE_STRING);
}
if (argv[1].equals("start-system-server")) {
startSystemServer();
} else if (!argv[1].equals("")) {
throw new RuntimeException(argv[0] + USAGE_STRING);
}
Log.i(TAG, "Accepting command socket connections");
runSelectLoop();
closeServerSocket();
} catch (MethodAndArgsCaller caller) {
caller.run();
} catch (RuntimeException ex) {
Log.e(TAG, "Zygote died with exception", ex);
closeServerSocket();
throw ex;
}
}
}毫无疑问，这里我们的重点在
startSystemServer();
目录/android/4.4/frameworks/base/services/java/com/android/server/SystemServer.java
class ServerThread {
80 private static final String TAG = "SystemServer";
81 private static final String ENCRYPTING_STATE = "trigger_restart_min_framework";
82 private static final String ENCRYPTED_STATE = "1";
83
84 ContentResolver mContentResolver;
85
86 void reportWtf(String msg, Throwable e) {
87 Slog.w(TAG, "***********************************************");
88 Log.wtf(TAG, "BOOT FAILURE " + msg, e);
89 }
90
91 public void initAndLoop() {
92 EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_SYSTEM_RUN,
93 SystemClock.uptimeMillis());
94
95 Looper.prepareMainLooper();
96
97 android.os.Process.setThreadPriority(
98 android.os.Process.THREAD_PRIORITY_FOREGROUND);
99
100 BinderInternal.disableBackgroundScheduling(true);
101 android.os.Process.setCanSelfBackground(false);
102
103 // Check whether we failed to shut down last time we tried.
104 {
105 final String shutdownAction = SystemProperties.get(
106 ShutdownThread.SHUTDOWN_ACTION_PROPERTY, "");
107 if (shutdownAction != null && shutdownAction.length() > 0) {
108 boolean reboot = (shutdownAction.charAt(0) == '1');
109
110 final String reason;
111 if (shutdownAction.length() > 1) {
112 reason = shutdownAction.substring(1, shutdownAction.length());
113 } else {
114 reason = null;
115 }
116
117 ShutdownThread.rebootOrShutdown(reboot, reason);
118 }
119 }
120
121 String factoryTestStr = SystemProperties.get("ro.factorytest");
122 int factoryTest = "".equals(factoryTestStr) ? SystemServer.FACTORY_TEST_OFF
123 : Integer.parseInt(factoryTestStr);
124 final boolean headless = "1".equals(SystemProperties.get("ro.config.headless", "0"));
125
126 Installer installer = null;
127 AccountManagerService accountManager = null;
128 ContentService contentService = null;
129 LightsService lights = null;
130 PowerManagerService power = null;
131 DisplayManagerService display = null;
132 BatteryService battery = null;
133 VibratorService vibrator = null;
134 AlarmManagerService alarm = null;
135 MountService mountService = null;
136 NetworkManagementService networkManagement = null;
137 NetworkStatsService networkStats = null;
138 NetworkPolicyManagerService networkPolicy = null;
139 ConnectivityService connectivity = null;
140 WifiP2pService wifiP2p = null;
141 WifiService wifi = null;
142 NsdService serviceDiscovery= null;
143 IPackageManager pm = null;
144 Context context = null;
145 WindowManagerService wm = null;
146 BluetoothManagerService bluetooth = null;
147 DockObserver dock = null;
148 UsbService usb = null;
149 SerialService serial = null;
150 TwilightService twilight = null;
151 UiModeManagerService uiMode = null;
152 RecognitionManagerService recognition = null;
153 NetworkTimeUpdateService networkTimeUpdater = null;
154 CommonTimeManagementService commonTimeMgmtService = null;
155 InputManagerService inputManager = null;
156 TelephonyRegistry telephonyRegistry = null;
157 ConsumerIrService consumerIr = null;
158
159 // Create a handler thread just for the window manager to enjoy.
160 HandlerThread wmHandlerThread = new HandlerThread("WindowManager");
161 wmHandlerThread.start();
162 Handler wmHandler = new Handler(wmHandlerThread.getLooper());
163 wmHandler.post(new Runnable() {
164 @Override
165 public void run() {
166 //Looper.myLooper().setMessageLogging(new LogPrinter(
167 // android.util.Log.DEBUG, TAG, android.util.Log.LOG_ID_SYSTEM));
168 android.os.Process.setThreadPriority(
169 android.os.Process.THREAD_PRIORITY_DISPLAY);
170 android.os.Process.setCanSelfBackground(false);
171
172 // For debug builds, log event loop stalls to dropbox for analysis.
173 if (StrictMode.conditionallyEnableDebugLogging()) {
174 Slog.i(TAG, "Enabled StrictMode logging for WM Looper");
175 }
176 }
177 });
178
179 // bootstrap services
180 boolean onlyCore = false;
181 boolean firstBoot = false;
182 try {
183 // Wait for installd to finished starting up so that it has a chance to
184 // create critical directories such as /data/user with the appropriate
185 // permissions. We need this to complete before we initialize other services.
186 Slog.i(TAG, "Waiting for installd to be ready.");
187 installer = new Installer();
188 installer.ping();
189
190 Slog.i(TAG, "Power Manager");
191 power = new PowerManagerService();
192 ServiceManager.addService(Context.POWER_SERVICE, power);
193
194 Slog.i(TAG, "Activity Manager");
195 context = ActivityManagerService.main(factoryTest);
196 } catch (RuntimeException e) {
197 Slog.e("System", "******************************************");
198 Slog.e("System", "************ Failure starting bootstrap service", e);
199 }
200
201 boolean disableStorage = SystemProperties.getBoolean("config.disable_storage", false);
202 boolean disableMedia = SystemProperties.getBoolean("config.disable_media", false);
203 boolean disableBluetooth = SystemProperties.getBoolean("config.disable_bluetooth", false);
204 boolean disableTelephony = SystemProperties.getBoolean("config.disable_telephony", false);
205 boolean disableLocation = SystemProperties.getBoolean("config.disable_location", false);
206 boolean disableSystemUI = SystemProperties.getBoolean("config.disable_systemui", false);
207 boolean disableNonCoreServices = SystemProperties.getBoolean("config.disable_noncore", false);
208 boolean disableNetwork = SystemProperties.getBoolean("config.disable_network", false);
209
210 try {
211 Slog.i(TAG, "Display Manager");
212 display = new DisplayManagerService(context, wmHandler);
213 ServiceManager.addService(Context.DISPLAY_SERVICE, display, true);
214
215 Slog.i(TAG, "Telephony Registry");
216 telephonyRegistry = new TelephonyRegistry(context);
217 ServiceManager.addService("telephony.registry", telephonyRegistry);
218
219 Slog.i(TAG, "Scheduling Policy");
220 ServiceManager.addService("scheduling_policy", new SchedulingPolicyService());
221
222 AttributeCache.init(context);
223
224 if (!display.waitForDefaultDisplay()) {
225 reportWtf("Timeout waiting for default display to be initialized.",
226 new Throwable());
227 }
228
229 Slog.i(TAG, "Package Manager");
230 // Only run "core" apps if we're encrypting the device.
231 String cryptState = SystemProperties.get("vold.decrypt");
232 if (ENCRYPTING_STATE.equals(cryptState)) {
233 Slog.w(TAG, "Detected encryption in progress - only parsing core apps");
234 onlyCore = true;
235 } else if (ENCRYPTED_STATE.equals(cryptState)) {
236 Slog.w(TAG, "Device encrypted - only parsing core apps");
237 onlyCore = true;
238 }
239
240 pm = PackageManagerService.main(context, installer,
241 factoryTest != SystemServer.FACTORY_TEST_OFF,
242 onlyCore);
243 try {
244 firstBoot = pm.isFirstBoot();
245 } catch (RemoteException e) {
246 }
247
248 ActivityManagerService.setSystemProcess();
249
250 Slog.i(TAG, "Entropy Mixer");
251 ServiceManager.addService("entropy", new EntropyMixer(context));
252
253 Slog.i(TAG, "User Service");
254 ServiceManager.addService(Context.USER_SERVICE,
255 UserManagerService.getInstance());
256
257 mContentResolver = context.getContentResolver();
258
259 // The AccountManager must come before the ContentService
260 try {
261 // TODO: seems like this should be disable-able, but req'd by ContentService
262 Slog.i(TAG, "Account Manager");
263 accountManager = new AccountManagerService(context);
264 ServiceManager.addService(Context.ACCOUNT_SERVICE, accountManager);
265 } catch (Throwable e) {
266 Slog.e(TAG, "Failure starting Account Manager", e);
267 }
268
269 Slog.i(TAG, "Content Manager");
270 contentService = ContentService.main(context,
271 factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL);
272
273 Slog.i(TAG, "System Content Providers");
274 ActivityManagerService.installSystemProviders();
275
276 Slog.i(TAG, "Lights Service");
277 lights = new LightsService(context);
278
279 Slog.i(TAG, "Battery Service");
280 battery = new BatteryService(context, lights);
281 ServiceManager.addService("battery", battery);
282
283 Slog.i(TAG, "Vibrator Service");
284 vibrator = new VibratorService(context);
285 ServiceManager.addService("vibrator", vibrator);
286
287 Slog.i(TAG, "Consumer IR Service");
288 consumerIr = new ConsumerIrService(context);
289 ServiceManager.addService(Context.CONSUMER_IR_SERVICE, consumerIr);
290
291 // only initialize the power service after we have started the
292 // lights service, content providers and the battery service.
293 power.init(context, lights, ActivityManagerService.self(), battery,
294 BatteryStatsService.getService(),
295 ActivityManagerService.self().getAppOpsService(), display);
296
297 Slog.i(TAG, "Alarm Manager");
298 alarm = new AlarmManagerService(context);
299 ServiceManager.addService(Context.ALARM_SERVICE, alarm);
300
301 Slog.i(TAG, "Init Watchdog");
302 Watchdog.getInstance().init(context, battery, power, alarm,
303 ActivityManagerService.self());
304 Watchdog.getInstance().addThread(wmHandler, "WindowManager thread");
305
306 Slog.i(TAG, "Input Manager");
307 inputManager = new InputManagerService(context, wmHandler);
308
309 Slog.i(TAG, "Window Manager");
310 wm = WindowManagerService.main(context, power, display, inputManager,
311 wmHandler, factoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL,
312 !firstBoot, onlyCore);
313 ServiceManager.addService(Context.WINDOW_SERVICE, wm);
314 ServiceManager.addService(Context.INPUT_SERVICE, inputManager);
315
316 ActivityManagerService.self().setWindowManager(wm);
317
318 inputManager.setWindowManagerCallbacks(wm.getInputMonitor());
319 inputManager.start();
320
321 display.setWindowManager(wm);
322 display.setInputManager(inputManager);
323
324 // Skip Bluetooth if we have an emulator kernel
325 // TODO: Use a more reliable check to see if this product should
326 // support Bluetooth - see bug 988521
327 if (SystemProperties.get("ro.kernel.qemu").equals("1")) {
328 Slog.i(TAG, "No Bluetooh Service (emulator)");
329 } else if (factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL) {
330 Slog.i(TAG, "No Bluetooth Service (factory test)");
331 } else if (!context.getPackageManager().hasSystemFeature
332 (PackageManager.FEATURE_BLUETOOTH)) {
333 Slog.i(TAG, "No Bluetooth Service (Bluetooth Hardware Not Present)");
334 } else if (disableBluetooth) {
335 Slog.i(TAG, "Bluetooth Service disabled by config");
336 } else {
337 Slog.i(TAG, "Bluetooth Manager Service");
338 bluetooth = new BluetoothManagerService(context);
339 ServiceManager.addService(BluetoothAdapter.BLUETOOTH_MANAGER_SERVICE, bluetooth);
340 }
341 } catch (RuntimeException e) {
342 Slog.e("System", "******************************************");
343 Slog.e("System", "************ Failure starting core service", e);
344 }
345
346 DevicePolicyManagerService devicePolicy = null;
347 StatusBarManagerService statusBar = null;
348 InputMethodManagerService imm = null;
349 AppWidgetService appWidget = null;
350 NotificationManagerService notification = null;
351 WallpaperManagerService wallpaper = null;
352 LocationManagerService location = null;
353 CountryDetectorService countryDetector = null;
354 TextServicesManagerService tsms = null;
355 LockSettingsService lockSettings = null;
356 DreamManagerService dreamy = null;
357 AssetAtlasService atlas = null;
358 PrintManagerService printManager = null;
359
360 // Bring up services needed for UI.
361 if (factoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL) {
362 //if (!disableNonCoreServices) { // TODO: View depends on these; mock them?
363 if (true) {
364 try {
365 Slog.i(TAG, "Input Method Service");
366 imm = new InputMethodManagerService(context, wm);
367 ServiceManager.addService(Context.INPUT_METHOD_SERVICE, imm);
368 } catch (Throwable e) {
369 reportWtf("starting Input Manager Service", e);
370 }
371
372 try {
373 Slog.i(TAG, "Accessibility Manager");
374 ServiceManager.addService(Context.ACCESSIBILITY_SERVICE,
375 new AccessibilityManagerService(context));
376 } catch (Throwable e) {
377 reportWtf("starting Accessibility Manager", e);
378 }
379 }
380 }
381
382 try {
383 wm.displayReady();
384 } catch (Throwable e) {
385 reportWtf("making display ready", e);
386 }
387
388 try {
389 pm.performBootDexOpt();
390 } catch (Throwable e) {
391 reportWtf("performing boot dexopt", e);
392 }
393
394 try {
395 ActivityManagerNative.getDefault().showBootMessage(
396 context.getResources().getText(
397 com.android.internal.R.string.android_upgrading_starting_apps),
398 false);
399 } catch (RemoteException e) {
400 }
401
402 if (factoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL) {
403 if (!disableStorage &&
404 !"0".equals(SystemProperties.get("system_init.startmountservice"))) {
405 try {
406 /*
407 * NotificationManagerService is dependant on MountService,
408 * (for media / usb notifications) so we must start MountService first.
409 */
410 Slog.i(TAG, "Mount Service");
411 mountService = new MountService(context);
412 ServiceManager.addService("mount", mountService);
413 } catch (Throwable e) {
414 reportWtf("starting Mount Service", e);
415 }
416 }
417
418 if (!disableNonCoreServices) {
419 try {
420 Slog.i(TAG, "LockSettingsService");
421 lockSettings = new LockSettingsService(context);
422 ServiceManager.addService("lock_settings", lockSettings);
423 } catch (Throwable e) {
424 reportWtf("starting LockSettingsService service", e);
425 }
426
427 try {
428 Slog.i(TAG, "Device Policy");
429 devicePolicy = new DevicePolicyManagerService(context);
430 ServiceManager.addService(Context.DEVICE_POLICY_SERVICE, devicePolicy);
431 } catch (Throwable e) {
432 reportWtf("starting DevicePolicyService", e);
433 }
434 }
435
436 if (!disableSystemUI) {
437 try {
438 Slog.i(TAG, "Status Bar");
439 statusBar = new StatusBarManagerService(context, wm);
440 ServiceManager.addService(Context.STATUS_BAR_SERVICE, statusBar);
441 } catch (Throwable e) {
442 reportWtf("starting StatusBarManagerService", e);
443 }
444 }
445
446 if (!disableNonCoreServices) {
447 try {
448 Slog.i(TAG, "Clipboard Service");
449 ServiceManager.addService(Context.CLIPBOARD_SERVICE,
450 new ClipboardService(context));
451 } catch (Throwable e) {
452 reportWtf("starting Clipboard Service", e);
453 }
454 }
455
456 if (!disableNetwork) {
457 try {
458 Slog.i(TAG, "NetworkManagement Service");
459 networkManagement = NetworkManagementService.create(context);
460 ServiceManager.addService(Context.NETWORKMANAGEMENT_SERVICE, networkManagement);
461 } catch (Throwable e) {
462 reportWtf("starting NetworkManagement Service", e);
463 }
464 }
465
466 if (!disableNonCoreServices) {
467 try {
468 Slog.i(TAG, "Text Service Manager Service");
469 tsms = new TextServicesManagerService(context);
470 ServiceManager.addService(Context.TEXT_SERVICES_MANAGER_SERVICE, tsms);
471 } catch (Throwable e) {
472 reportWtf("starting Text Service Manager Service", e);
473 }
474 }
475
476 if (!disableNetwork) {
477 try {
478 Slog.i(TAG, "NetworkStats Service");
479 networkStats = new NetworkStatsService(context, networkManagement, alarm);
480 ServiceManager.addService(Context.NETWORK_STATS_SERVICE, networkStats);
481 } catch (Throwable e) {
482 reportWtf("starting NetworkStats Service", e);
483 }
484
485 try {
486 Slog.i(TAG, "NetworkPolicy Service");
487 networkPolicy = new NetworkPolicyManagerService(
488 context, ActivityManagerService.self(), power,
489 networkStats, networkManagement);
490 ServiceManager.addService(Context.NETWORK_POLICY_SERVICE, networkPolicy);
491 } catch (Throwable e) {
492 reportWtf("starting NetworkPolicy Service", e);
493 }
494
495 try {
496 Slog.i(TAG, "Wi-Fi P2pService");
497 wifiP2p = new WifiP2pService(context);
498 ServiceManager.addService(Context.WIFI_P2P_SERVICE, wifiP2p);
499 } catch (Throwable e) {
500 reportWtf("starting Wi-Fi P2pService", e);
501 }
502
503 try {
504 Slog.i(TAG, "Wi-Fi Service");
505 wifi = new WifiService(context);
506 ServiceManager.addService(Context.WIFI_SERVICE, wifi);
507 } catch (Throwable e) {
508 reportWtf("starting Wi-Fi Service", e);
509 }
510
511 try {
512 Slog.i(TAG, "Connectivity Service");
513 connectivity = new ConnectivityService(
514 context, networkManagement, networkStats, networkPolicy);
515 ServiceManager.addService(Context.CONNECTIVITY_SERVICE, connectivity);
516 networkStats.bindConnectivityManager(connectivity);
517 networkPolicy.bindConnectivityManager(connectivity);
518
519 wifiP2p.connectivityServiceReady();
520 wifi.checkAndStartWifi();
521 } catch (Throwable e) {
522 reportWtf("starting Connectivity Service", e);
523 }
524
525 try {
526 Slog.i(TAG, "Network Service Discovery Service");
527 serviceDiscovery = NsdService.create(context);
528 ServiceManager.addService(
529 Context.NSD_SERVICE, serviceDiscovery);
530 } catch (Throwable e) {
531 reportWtf("starting Service Discovery Service", e);
532 }
533 }
534
535 if (!disableNonCoreServices) {
536 try {
537 Slog.i(TAG, "UpdateLock Service");
538 ServiceManager.addService(Context.UPDATE_LOCK_SERVICE,
539 new UpdateLockService(context));
540 } catch (Throwable e) {
541 reportWtf("starting UpdateLockService", e);
542 }
543 }
544
545 /*
546 * MountService has a few dependencies: Notification Manager and
547 * AppWidget Provider. Make sure MountService is completely started
548 * first before continuing.
549 */
550 if (mountService != null && !onlyCore) {
551 mountService.waitForAsecScan();
552 }
553
554 try {
555 if (accountManager != null)
556 accountManager.systemReady();
557 } catch (Throwable e) {
558 reportWtf("making Account Manager Service ready", e);
559 }
560
561 try {
562 if (contentService != null)
563 contentService.systemReady();
564 } catch (Throwable e) {
565 reportWtf("making Content Service ready", e);
566 }
567
568 try {
569 Slog.i(TAG, "Notification Manager");
570 notification = new NotificationManagerService(context, statusBar, lights);
571 ServiceManager.addService(Context.NOTIFICATION_SERVICE, notification);
572 networkPolicy.bindNotificationManager(notification);
573 } catch (Throwable e) {
574 reportWtf("starting Notification Manager", e);
575 }
576
577 try {
578 Slog.i(TAG, "Device Storage Monitor");
579 ServiceManager.addService(DeviceStorageMonitorService.SERVICE,
580 new DeviceStorageMonitorService(context));
581 } catch (Throwable e) {
582 reportWtf("starting DeviceStorageMonitor service", e);
583 }
584
585 if (!disableLocation) {
586 try {
587 Slog.i(TAG, "Location Manager");
588 location = new LocationManagerService(context);
589 ServiceManager.addService(Context.LOCATION_SERVICE, location);
590 } catch (Throwable e) {
591 reportWtf("starting Location Manager", e);
592 }
593
594 try {
595 Slog.i(TAG, "Country Detector");
596 countryDetector = new CountryDetectorService(context);
597 ServiceManager.addService(Context.COUNTRY_DETECTOR, countryDetector);
598 } catch (Throwable e) {
599 reportWtf("starting Country Detector", e);
600 }
601 }
602
603 if (!disableNonCoreServices) {
604 try {
605 Slog.i(TAG, "Search Service");
606 ServiceManager.addService(Context.SEARCH_SERVICE,
607 new SearchManagerService(context));
608 } catch (Throwable e) {
609 reportWtf("starting Search Service", e);
610 }
611 }
612
613 try {
614 Slog.i(TAG, "DropBox Service");
615 ServiceManager.addService(Context.DROPBOX_SERVICE,
616 new DropBoxManagerService(context, new File("/data/system/dropbox")));
617 } catch (Throwable e) {
618 reportWtf("starting DropBoxManagerService", e);
619 }
620
621 if (!disableNonCoreServices && context.getResources().getBoolean(
622 R.bool.config_enableWallpaperService)) {
623 try {
624 Slog.i(TAG, "Wallpaper Service");
625 if (!headless) {
626 wallpaper = new WallpaperManagerService(context);
627 ServiceManager.addService(Context.WALLPAPER_SERVICE, wallpaper);
628 }
629 } catch (Throwable e) {
630 reportWtf("starting Wallpaper Service", e);
631 }
632 }
633
634 if (!disableMedia && !"0".equals(SystemProperties.get("system_init.startaudioservice"))) {
635 try {
636 Slog.i(TAG, "Audio Service");
637 ServiceManager.addService(Context.AUDIO_SERVICE, new AudioService(context));
638 } catch (Throwable e) {
639 reportWtf("starting Audio Service", e);
640 }
641 }
642
643 if (!disableNonCoreServices) {
644 try {
645 Slog.i(TAG, "Dock Observer");
646 // Listen for dock station changes
647 dock = new DockObserver(context);
648 } catch (Throwable e) {
649 reportWtf("starting DockObserver", e);
650 }
651 }
652
653 if (!disableMedia) {
654 try {
655 Slog.i(TAG, "Wired Accessory Manager");
656 // Listen for wired headset changes
657 inputManager.setWiredAccessoryCallbacks(
658 new WiredAccessoryManager(context, inputManager));
659 } catch (Throwable e) {
660 reportWtf("starting WiredAccessoryManager", e);
661 }
662 }
663
664 if (!disableNonCoreServices) {
665 try {
666 Slog.i(TAG, "USB Service");
667 // Manage USB host and device support
668 usb = new UsbService(context);
669 ServiceManager.addService(Context.USB_SERVICE, usb);
670 } catch (Throwable e) {
671 reportWtf("starting UsbService", e);
672 }
673
674 try {
675 Slog.i(TAG, "Serial Service");
676 // Serial port support
677 serial = new SerialService(context);
678 ServiceManager.addService(Context.SERIAL_SERVICE, serial);
679 } catch (Throwable e) {
680 Slog.e(TAG, "Failure starting SerialService", e);
681 }
682 }
683
684 try {
685 Slog.i(TAG, "Twilight Service");
686 twilight = new TwilightService(context);
687 } catch (Throwable e) {
688 reportWtf("starting TwilightService", e);
689 }
690
691 try {
692 Slog.i(TAG, "UI Mode Manager Service");
693 // Listen for UI mode changes
694 uiMode = new UiModeManagerService(context, twilight);
695 } catch (Throwable e) {
696 reportWtf("starting UiModeManagerService", e);
697 }
698
699 if (!disableNonCoreServices) {
700 try {
701 Slog.i(TAG, "Backup Service");
702 ServiceManager.addService(Context.BACKUP_SERVICE,
703 new BackupManagerService(context));
704 } catch (Throwable e) {
705 Slog.e(TAG, "Failure starting Backup Service", e);
706 }
707
708 try {
709 Slog.i(TAG, "AppWidget Service");
710 appWidget = new AppWidgetService(context);
711 ServiceManager.addService(Context.APPWIDGET_SERVICE, appWidget);
712 } catch (Throwable e) {
713 reportWtf("starting AppWidget Service", e);
714 }
715
716 try {
717 Slog.i(TAG, "Recognition Service");
718 recognition = new RecognitionManagerService(context);
719 } catch (Throwable e) {
720 reportWtf("starting Recognition Service", e);
721 }
722 }
723
724 try {
725 Slog.i(TAG, "DiskStats Service");
726 ServiceManager.addService("diskstats", new DiskStatsService(context));
727 } catch (Throwable e) {
728 reportWtf("starting DiskStats Service", e);
729 }
730
731 try {
732 // need to add this service even if SamplingProfilerIntegration.isEnabled()
733 // is false, because it is this service that detects system property change and
734 // turns on SamplingProfilerIntegration. Plus, when sampling profiler doesn't work,
735 // there is little overhead for running this service.
736 Slog.i(TAG, "SamplingProfiler Service");
737 ServiceManager.addService("samplingprofiler",
738 new SamplingProfilerService(context));
739 } catch (Throwable e) {
740 reportWtf("starting SamplingProfiler Service", e);
741 }
742
743 if (!disableNetwork) {
744 try {
745 Slog.i(TAG, "NetworkTimeUpdateService");
746 networkTimeUpdater = new NetworkTimeUpdateService(context);
747 } catch (Throwable e) {
748 reportWtf("starting NetworkTimeUpdate service", e);
749 }
750 }
751
752 if (!disableMedia) {
753 try {
754 Slog.i(TAG, "CommonTimeManagementService");
755 commonTimeMgmtService = new CommonTimeManagementService(context);
756 ServiceManager.addService("commontime_management", commonTimeMgmtService);
757 } catch (Throwable e) {
758 reportWtf("starting CommonTimeManagementService service", e);
759 }
760 }
761
762 if (!disableNetwork) {
763 try {
764 Slog.i(TAG, "CertBlacklister");
765 CertBlacklister blacklister = new CertBlacklister(context);
766 } catch (Throwable e) {
767 reportWtf("starting CertBlacklister", e);
768 }
769 }
770
771 if (!disableNonCoreServices &&
772 context.getResources().getBoolean(R.bool.config_dreamsSupported)) {
773 try {
774 Slog.i(TAG, "Dreams Service");
775 // Dreams (interactive idle-time views, a/k/a screen savers)
776 dreamy = new DreamManagerService(context, wmHandler);
777 ServiceManager.addService(DreamService.DREAM_SERVICE, dreamy);
778 } catch (Throwable e) {
779 reportWtf("starting DreamManagerService", e);
780 }
781 }
782
783 if (!disableNonCoreServices) {
784 try {
785 Slog.i(TAG, "Assets Atlas Service");
786 atlas = new AssetAtlasService(context);
787 ServiceManager.addService(AssetAtlasService.ASSET_ATLAS_SERVICE, atlas);
788 } catch (Throwable e) {
789 reportWtf("starting AssetAtlasService", e);
790 }
791 }
792
793 try {
794 Slog.i(TAG, "IdleMaintenanceService");
795 new IdleMaintenanceService(context, battery);
796 } catch (Throwable e) {
797 reportWtf("starting IdleMaintenanceService", e);
798 }
799
800 try {
801 Slog.i(TAG, "Print Service");
802 printManager = new PrintManagerService(context);
803 ServiceManager.addService(Context.PRINT_SERVICE, printManager);
804 } catch (Throwable e) {
805 reportWtf("starting Print Service", e);
806 }
807 }
808
809 // Before things start rolling, be sure we have decided whether
810 // we are in safe mode.
811 final boolean safeMode = wm.detectSafeMode();
812 if (safeMode) {
813 ActivityManagerService.self().enterSafeMode();
814 // Post the safe mode state in the Zygote class
815 Zygote.systemInSafeMode = true;
816 // Disable the JIT for the system_server process
817 VMRuntime.getRuntime().disableJitCompilation();
818 } else {
819 // Enable the JIT for the system_server process
820 VMRuntime.getRuntime().startJitCompilation();
821 }
822
823 // It is now time to start up the app processes...
824
825 try {
826 vibrator.systemReady();
827 } catch (Throwable e) {
828 reportWtf("making Vibrator Service ready", e);
829 }
830
831 if (lockSettings != null) {
832 try {
833 lockSettings.systemReady();
834 } catch (Throwable e) {
835 reportWtf("making Lock Settings Service ready", e);
836 }
837 }
838
839 if (devicePolicy != null) {
840 try {
841 devicePolicy.systemReady();
842 } catch (Throwable e) {
843 reportWtf("making Device Policy Service ready", e);
844 }
845 }
846
847 if (notification != null) {
848 try {
849 notification.systemReady();
850 } catch (Throwable e) {
851 reportWtf("making Notification Service ready", e);
852 }
853 }
854
855 try {
856 wm.systemReady();
857 } catch (Throwable e) {
858 reportWtf("making Window Manager Service ready", e);
859 }
860
861 if (safeMode) {
862 ActivityManagerService.self().showSafeModeOverlay();
863 }
864
865 // Update the configuration for this context by hand, because we're going
866 // to start using it before the config change done in wm.systemReady() will
867 // propagate to it.
868 Configuration config = wm.computeNewConfiguration();
869 DisplayMetrics metrics = new DisplayMetrics();
870 WindowManager w = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
871 w.getDefaultDisplay().getMetrics(metrics);
872 context.getResources().updateConfiguration(config, metrics);
873
874 try {
875 power.systemReady(twilight, dreamy);
876 } catch (Throwable e) {
877 reportWtf("making Power Manager Service ready", e);
878 }
879
880 try {
881 pm.systemReady();
882 } catch (Throwable e) {
883 reportWtf("making Package Manager Service ready", e);
884 }
885
886 try {
887 display.systemReady(safeMode, onlyCore);
888 } catch (Throwable e) {
889 reportWtf("making Display Manager Service ready", e);
890 }
891
892 // These are needed to propagate to the runnable below.
893 final Context contextF = context;
894 final MountService mountServiceF = mountService;
895 final BatteryService batteryF = battery;
896 final NetworkManagementService networkManagementF = networkManagement;
897 final NetworkStatsService networkStatsF = networkStats;
898 final NetworkPolicyManagerService networkPolicyF = networkPolicy;
899 final ConnectivityService connectivityF = connectivity;
900 final DockObserver dockF = dock;
901 final UsbService usbF = usb;
902 final TwilightService twilightF = twilight;
903 final UiModeManagerService uiModeF = uiMode;
904 final AppWidgetService appWidgetF = appWidget;
905 final WallpaperManagerService wallpaperF = wallpaper;
906 final InputMethodManagerService immF = imm;
907 final RecognitionManagerService recognitionF = recognition;
908 final LocationManagerService locationF = location;
909 final CountryDetectorService countryDetectorF = countryDetector;
910 final NetworkTimeUpdateService networkTimeUpdaterF = networkTimeUpdater;
911 final CommonTimeManagementService commonTimeMgmtServiceF = commonTimeMgmtService;
912 final TextServicesManagerService textServiceManagerServiceF = tsms;
913 final StatusBarManagerService statusBarF = statusBar;
914 final DreamManagerService dreamyF = dreamy;
915 final AssetAtlasService atlasF = atlas;
916 final InputManagerService inputManagerF = inputManager;
917 final TelephonyRegistry telephonyRegistryF = telephonyRegistry;
918 final PrintManagerService printManagerF = printManager;
919
920 // We now tell the activity manager it is okay to run third party
921 // code. It will call back into us once it has gotten to the state
922 // where third party code can really run (but before it has actually
923 // started launching the initial applications), for us to complete our
924 // initialization.
925 ActivityManagerService.self().systemReady(new Runnable() {
926 public void run() {
927 Slog.i(TAG, "Making services ready");
928
929 try {
930 ActivityManagerService.self().startObservingNativeCrashes();
931 } catch (Throwable e) {
932 reportWtf("observing native crashes", e);
933 }
934 if (!headless) {
935 startSystemUi(contextF);
936 }
937 try {
938 if (mountServiceF != null) mountServiceF.systemReady();
939 } catch (Throwable e) {
940 reportWtf("making Mount Service ready", e);
941 }
942 try {
943 if (batteryF != null) batteryF.systemReady();
944 } catch (Throwable e) {
945 reportWtf("making Battery Service ready", e);
946 }
947 try {
948 if (networkManagementF != null) networkManagementF.systemReady();
949 } catch (Throwable e) {
950 reportWtf("making Network Managment Service ready", e);
951 }
952 try {
953 if (networkStatsF != null) networkStatsF.systemReady();
954 } catch (Throwable e) {
955 reportWtf("making Network Stats Service ready", e);
956 }
957 try {
958 if (networkPolicyF != null) networkPolicyF.systemReady();
959 } catch (Throwable e) {
960 reportWtf("making Network Policy Service ready", e);
961 }
962 try {
963 if (connectivityF != null) connectivityF.systemReady();
964 } catch (Throwable e) {
965 reportWtf("making Connectivity Service ready", e);
966 }
967 try {
968 if (dockF != null) dockF.systemReady();
969 } catch (Throwable e) {
970 reportWtf("making Dock Service ready", e);
971 }
972 try {
973 if (usbF != null) usbF.systemReady();
974 } catch (Throwable e) {
975 reportWtf("making USB Service ready", e);
976 }
977 try {
978 if (twilightF != null) twilightF.systemReady();
979 } catch (Throwable e) {
980 reportWtf("makin Twilight Service ready", e);
981 }
982 try {
983 if (uiModeF != null) uiModeF.systemReady();
984 } catch (Throwable e) {
985 reportWtf("making UI Mode Service ready", e);
986 }
987 try {
988 if (recognitionF != null) recognitionF.systemReady();
989 } catch (Throwable e) {
990 reportWtf("making Recognition Service ready", e);
991 }
992 Watchdog.getInstance().start();
993
994 // It is now okay to let the various system services start their
995 // third party code...
996
997 try {
998 if (appWidgetF != null) appWidgetF.systemRunning(safeMode);
999 } catch (Throwable e) {
1000 reportWtf("Notifying AppWidgetService running", e);
1001 }
1002 try {
1003 if (wallpaperF != null) wallpaperF.systemRunning();
1004 } catch (Throwable e) {
1005 reportWtf("Notifying WallpaperService running", e);
1006 }
1007 try {
1008 if (immF != null) immF.systemRunning(statusBarF);
1009 } catch (Throwable e) {
1010 reportWtf("Notifying InputMethodService running", e);
1011 }
1012 try {
1013 if (locationF != null) locationF.systemRunning();
1014 } catch (Throwable e) {
1015 reportWtf("Notifying Location Service running", e);
1016 }
1017 try {
1018 if (countryDetectorF != null) countryDetectorF.systemRunning();
1019 } catch (Throwable e) {
1020 reportWtf("Notifying CountryDetectorService running", e);
1021 }
1022 try {
1023 if (networkTimeUpdaterF != null) networkTimeUpdaterF.systemRunning();
1024 } catch (Throwable e) {
1025 reportWtf("Notifying NetworkTimeService running", e);
1026 }
1027 try {
1028 if (commonTimeMgmtServiceF != null) commonTimeMgmtServiceF.systemRunning();
1029 } catch (Throwable e) {
1030 reportWtf("Notifying CommonTimeManagementService running", e);
1031 }
1032 try {
1033 if (textServiceManagerServiceF != null)
1034 textServiceManagerServiceF.systemRunning();
1035 } catch (Throwable e) {
1036 reportWtf("Notifying TextServicesManagerService running", e);
1037 }
1038 try {
1039 if (dreamyF != null) dreamyF.systemRunning();
1040 } catch (Throwable e) {
1041 reportWtf("Notifying DreamManagerService running", e);
1042 }
1043 try {
1044 if (atlasF != null) atlasF.systemRunning();
1045 } catch (Throwable e) {
1046 reportWtf("Notifying AssetAtlasService running", e);
1047 }
1048 try {
1049 // TODO(BT) Pass parameter to input manager
1050 if (inputManagerF != null) inputManagerF.systemRunning();
1051 } catch (Throwable e) {
1052 reportWtf("Notifying InputManagerService running", e);
1053 }
1054
1055 try {
1056 if (telephonyRegistryF != null) telephonyRegistryF.systemRunning();
1057 } catch (Throwable e) {
1058 reportWtf("Notifying TelephonyRegistry running", e);
1059 }
1060
1061 try {
1062 if (printManagerF != null) printManagerF.systemRuning();
1063 } catch (Throwable e) {
1064 reportWtf("Notifying PrintManagerService running", e);
1065 }
1066 }
1067 });
1068
1069 // For debug builds, log event loop stalls to dropbox for analysis.
1070 if (StrictMode.conditionallyEnableDebugLogging()) {
1071 Slog.i(TAG, "Enabled StrictMode for system server main thread.");
1072 }
1073
1074 Looper.loop();
1075 Slog.d(TAG, "System ServerThread is exiting!");
1076 }
1077
1078 static final void startSystemUi(Context context) {
1079 Intent intent = new Intent();
1080 intent.setComponent(new ComponentName("com.android.systemui",
1081 "com.android.systemui.SystemUIService"));
1082 //Slog.d(TAG, "Starting service: " + intent);
1083 context.startServiceAsUser(intent, UserHandle.OWNER);
1084 }
1085}
1086
1087public class SystemServer {
1088 private static final String TAG = "SystemServer";
1089
1090 public static final int FACTORY_TEST_OFF = 0;
1091 public static final int FACTORY_TEST_LOW_LEVEL = 1;
1092 public static final int FACTORY_TEST_HIGH_LEVEL = 2;
1093
1094 static Timer timer;
1095 static final long SNAPSHOT_INTERVAL = 60 * 60 * 1000; // 1hr
1096
1097 // The earliest supported time. We pick one day into 1970, to
1098 // give any timezone code room without going into negative time.
1099 private static final long EARLIEST_SUPPORTED_TIME = 86400 * 1000;
1100
1101 /**
1102 * Called to initialize native system services.
1103 */
1104 private static native void nativeInit();
1105
1106 public static void main(String[] args) {
1107
1108 /*
1109 * In case the runtime switched since last boot (such as when
1110 * the old runtime was removed in an OTA), set the system
1111 * property so that it is in sync. We can't do this in
1112 * libnativehelper's JniInvocation::Init code where we already
1113 * had to fallback to a different runtime because it is
1114 * running as root and we need to be the system user to set
1115 * the property. http://b/11463182
1116 */
1117 SystemProperties.set("persist.sys.dalvik.vm.lib",
1118 VMRuntime.getRuntime().vmLibrary());
1119
1120 if (System.currentTimeMillis() < EARLIEST_SUPPORTED_TIME) {
1121 // If a device's clock is before 1970 (before 0), a lot of
1122 // APIs crash dealing with negative numbers, notably
1123 // java.io.File#setLastModified, so instead we fake it and
1124 // hope that time from cell towers or NTP fixes it
1125 // shortly.
1126 Slog.w(TAG, "System clock is before 1970; setting to 1970.");
1127 SystemClock.setCurrentTimeMillis(EARLIEST_SUPPORTED_TIME);
1128 }
1129
1130 if (SamplingProfilerIntegration.isEnabled()) {
1131 SamplingProfilerIntegration.start();
1132 timer = new Timer();
1133 timer.schedule(new TimerTask() {
1134 @Override
1135 public void run() {
1136 SamplingProfilerIntegration.writeSnapshot("system_server", null);
1137 }
1138 }, SNAPSHOT_INTERVAL, SNAPSHOT_INTERVAL);
1139 }
1140
1141 // Mmmmmm... more memory!
1142 dalvik.system.VMRuntime.getRuntime().clearGrowthLimit();
1143
1144 // The system server has to run all of the time, so it needs to be
1145 // as efficient as possible with its memory usage.
1146 VMRuntime.getRuntime().setTargetHeapUtilization(0.8f);
1147
1148 Environment.setUserRequired(true);
1149
1150 System.loadLibrary("android_servers");
1151
1152 Slog.i(TAG, "Entered the Android system server!");
1153
1154 // Initialize native services.
1155 nativeInit();
1156
1157 // This used to be its own separate thread, but now it is
1158 // just the loop we run on the main thread.
1159 ServerThread thr = new ServerThread();
1160 thr.initAndLoop();
1161 }
1162}这里，我们给出了全部的代码，但是很明显我们的重点在SystemSever中的main入口
前面一大堆关于Time 和Dalvik处理我们不管，我们只用关心
1159 ServerThread thr = new ServerThread();
1160 thr.initAndLoop();
我们进一步追踪到SeverThread中initAndLoop(),那么initAndLoop又是做什么的，查看源码很容易发现
基本上所有的系统服务都是在这里初始化 和SystemReady()
例如
public void initAndLoop() {
.......
BatteryService battery = null;
VibratorService vibrator = null;
........
boolean disableTelephony = SystemProperties.getBoolean("config.disable_telephony", false);
boolean disableSystemUI = SystemProperties.getBoolean("config.disable_systemui", false);
.........
try {
......
telephonyRegistry = new TelephonyRegistry(context);
ServiceManager.addService("telephony.registry", telephonyRegistry);
.......
}
battery = new BatteryService(context, lights);
ServiceManager.addService("battery", battery);
.......
vibrator = new VibratorService(context);
ServiceManager.addService("vibrator", vibrator);
....
if (!disableSystemUI) {
try{
statusBar = new StatusBarManagerService(context, wm);
ServiceManager.addService(Context.STATUS_BAR_SERVICE, statusBar);
}
}
..........
try{
vibrator.systemReady();
}catch(Throwable e){
reportWtf("making Vibrator Service ready", e);
}
}这里，我抽出最典型的VibratorService启动过程给打击看，这也就解释了为什么我们通过
WindowManager WM= (WindowManager)Context.getSystemService(Context.WINDOW_SERVICE);
同时，在这里我也想提醒大家，我们的SystemUI也是在这里初始化的
1078 static final void startSystemUi(Context context) {
1079 Intent intent = new Intent();
1080 intent.setComponent(new ComponentName("com.android.systemui",
1081 "com.android.systemui.SystemUIService"));
1082 //Slog.d(TAG, "Starting service: " + intent);
1083 context.startServiceAsUser(intent, UserHandle.OWNER);
1084 }