Android系统SystemServer进程启动过程源码分析

frameworks/base/core/java/com/android/internal/os/ZygoteInit.java文件中：

Step1、startSystemServer函数

[java] view plain copy

publicclassZygoteInit{
......
privatestaticbooleanstartSystemServer()
throwsMethodAndArgsCaller,RuntimeException{
/*Hardcodedcommandlinetostartthesystemserver*/
Stringargs[]={
"--setuid=1000",
"--setgid=1000",
"--setgroups=1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,1018,3001,3002,3003",
"--capabilities=130104352,130104352",
"--runtime-init",
"--nice-name=system_server",
"com.android.server.SystemServer",
};
ZygoteConnection.ArgumentsparsedArgs=null;
intpid;
try{
parsedArgs=newZygoteConnection.Arguments(args);
......
/*Requesttoforkthesystemserverprocess*/
//startSystemServer()调用Zygote的native方法 forkSystemServer(),java端的Zygote的准备工作就结束了,接下来就交给C/C++端的Zygote来执行fork任务了，在/dalvik/vm/native/dalvik_system_Zygote.c 中，Dalvik_dalvik_system_Zygote_forkSystemServer函数中（自己去看源码）
这个里面的fork进程主要是使用linux的fork进程
//Zygote进程通过Zygote.forkSystemServer函数来创建一个新的进程来启动SystemServer组件
pid=Zygote.forkSystemServer(
parsedArgs.uid,parsedArgs.gid,
parsedArgs.gids,debugFlags,null,
parsedArgs.permittedCapabilities,
parsedArgs.effectiveCapabilities);
}catch(IllegalArgumentExceptionex){
......
}
/*Forchildprocess*/
//新创建的子进程会执行handleSystemServerProcess函数。
if(pid==0){
handleSystemServerProcess(parsedArgs);
}
returntrue;
}
......
}

[java] view plain copy

publicclassZygoteInit{
......
privatestaticvoidhandleSystemServerProcess(
ZygoteConnection.ArgumentsparsedArgs)
throwsZygoteInit.MethodAndArgsCaller{
//Zygote进程创建的子进程会继承Zygote进程创建的Socket文件描述符，而这里的子进程又不会用到它，因此，这里就调用closeServerSocket函数来关闭它。
closeServerSocket();
/*
*PasstheremainingargumentstoSystemServer.
*"--nice-name=system_servercom.android.server.SystemServer"
*/
//进一步执行启动SystemServer组件的操作
RuntimeInit.zygoteInit(parsedArgs.remainingArgs);
/*shouldneverreachhere*/
}
......
}

函数定义在frameworks/base/core/java/com/android/internal/os/RuntimeInit.java文件中：

[java] view plain copy

publicclassRuntimeInit{
......
publicstaticfinalvoidzygoteInit(String[]argv)
throwsZygoteInit.MethodAndArgsCaller{
......
//执行一个Binder进程间通信机制的初始化工作，这个工作完成之后，这个进程中的Binder对象就可以方便地进行进程间通信了
//函数zygoteInitNative是一个Native函数，实现在frameworks/base/core/jni/AndroidRuntime.cpp文件中，这里我们就不再细看了
zygoteInitNative();
......
//调用上面传进来的com.android.server.SystemServer类的main函数。
//Remainingargumentsarepassedtothestartclass'sstaticmain
StringstartClass=argv[curArg++];
String[]startArgs=newString[argv.length-curArg];
System.arraycopy(argv,curArg,startArgs,0,startArgs.length);
invokeStaticMain(startClass,startArgs);
}
......
}

这个函数定义在frameworks/base/services/java/com/android/server/SystemServer.java文件中：

[java] view plain copy

publicclassSystemServer
{
......
nativepublicstaticvoidinit1(String[]args);
......
publicstaticvoidmain(String[]args){
......
init1(args);//首先会执行JNI方法init1，然后init1会调用这里的init2函数
......
}
publicstaticfinalvoidinit2(){
Slog.i(TAG,"EnteredtheAndroidsystemserver!");
//创建一个ServerThread线程对象来执行一些系统关键服务的启动操作，
//例如PackageManagerService和ActivityManagerService
Threadthr=newServerThread();
thr.setName("android.server.ServerThread");
thr.start();
}
......
}

Step2 、 frameworks/base/services/jni/com_android_server_SystemServer.cpp文件中：

[cpp] view plain copy

namespaceandroid{
extern"C"intsystem_init();
staticvoidandroid_server_SystemServer_init1(JNIEnv*env,jobjectclazz)
{
system_init();
}
/*
*JNIregistration.
*/
staticJNINativeMethodgMethods[]={
/*name,signature,funcPtr*/
{"init1","([Ljava/lang/String;)V",(void*)android_server_SystemServer_init1},
};
intregister_android_server_SystemServer(JNIEnv*env)
{
returnjniRegisterNativeMethods(env,"com/android/server/SystemServer",
gMethods,NELEM(gMethods));
}
};//namespaceandroid

函数system_init实现在libsystem_server库中，源代码位于frameworks/base/cmds/system_server/library/system_init.cpp文件中：

[cpp] view plain copy

extern"C"status_tsystem_init()
{
LOGI("Enteredsystem_init()");
sp<ProcessState>proc(ProcessState::self());
sp<IServiceManager>sm=defaultServiceManager();
LOGI("ServiceManager:%p\n",sm.get());
sp<GrimReaper>grim=newGrimReaper();
sm->asBinder()->linkToDeath(grim,grim.get(),0);
charpropBuf[PROPERTY_VALUE_MAX];
property_get("system_init.startsurfaceflinger",propBuf,"1");
if(strcmp(propBuf,"1")==0){
//StarttheSurfaceFlinger
SurfaceFlinger::instantiate();
}
//Startthesensorservice
SensorService::instantiate();
//Onthesimulator,audioflingeretaldon'tgetstartedthe
//samewayasonthedevice,andweneedtostartthemhere
if(!proc->supportsProcesses()){
//StarttheAudioFlinger
AudioFlinger::instantiate();
//Startthemediaplaybackservice
MediaPlayerService::instantiate();
//Startthecameraservice
CameraService::instantiate();
//Starttheaudiopolicyservice
AudioPolicyService::instantiate();
}
//AndnowstarttheAndroidruntime.Wehavetodothisbit
//ofnastinessbecausetheAndroidruntimeinitializationrequires
//someofthecoresystemservicestoalreadybestarted.
//AllotherserversshouldjuststarttheAndroidruntimeat
//thebeginningoftheirprocesses'smain(),beforecalling
//theinitfunction.
LOGI("Systemserver:startingAndroidruntime.\n");
AndroidRuntime*runtime=AndroidRuntime::getRuntime();
LOGI("Systemserver:startingAndroidservices.\n");
runtime->callStatic("com/android/server/SystemServer","init2");
//Ifrunninginourownprocess,justgointothethread
//pool.Otherwise,calltheinitializationfinished
//functoletthisprocesscontinueitsinitilization.
if(proc->supportsProcesses()){
LOGI("Systemserver:enteringthreadpool.\n");
ProcessState::self()->startThreadPool();
IPCThreadState::self()->joinThreadPool();
LOGI("Systemserver:exitingthreadpool.\n");
}
returnNO_ERROR;
}

这个函数首先会初始化SurfaceFlinger、SensorService、AudioFlinger、MediaPlayerService、CameraService和AudioPolicyService这几个服务，然后就通过系统全局唯一的AndroidRuntime实例变量runtime的callStatic来调用SystemServer的init2函数了。

这个函数定义在frameworks/base/core/jni/AndroidRuntime.cpp文件中：

[cpp] view plain copy

/*
*CallastaticJavaProgrammingLanguagefunctionthattakesnoargumentsandreturnsvoid.
*/
status_tAndroidRuntime::callStatic(constchar*className,constchar*methodName)
{
JNIEnv*env;
jclassclazz;
jmethodIDmethodId;
env=getJNIEnv();
if(env==NULL)
returnUNKNOWN_ERROR;
clazz=findClass(env,className);
if(clazz==NULL){
LOGE("ERROR:couldnotfindclass'%s'\n",className);
returnUNKNOWN_ERROR;
}
methodId=env->GetStaticMethodID(clazz,methodName,"()V");
if(methodId==NULL){
LOGE("ERROR:couldnotfindmethod%s.%s\n",className,methodName);
returnUNKNOWN_ERROR;
}
env->CallStaticVoidMethod(clazz,methodId);
returnNO_ERROR;
}

这个函数调用由参数className指定的java类的静态成员函数，这个静态成员函数是由参数methodName指定的。上面传进来的参数className的值为"com/android/server/SystemServer"，而参数methodName的值为"init2"，因此，接下来就会调用SystemServer类的init2函数了。

Step3、

这个函数定义在frameworks/base/services/java/com/android/server/SystemServer.java文件中：

[java] view plain copy

classServerThreadextendsThread{
privatestaticfinalStringTAG="SystemServer";
privatefinalstaticbooleanINCLUDE_DEMO=false;
privatestaticfinalintLOG_BOOT_PROGRESS_SYSTEM_RUN=3010;
privateContentResolvermContentResolver;
privateclassAdbSettingsObserverextendsContentObserver{
publicAdbSettingsObserver(){
super(null);
}
@Override
publicvoidonChange(booleanselfChange){
booleanenableAdb=(Settings.Secure.getInt(mContentResolver,
Settings.Secure.ADB_ENABLED,0)>0);
//settingthissecurepropertywillstartorstopadbd
SystemProperties.set("persist.service.adb.enable",enableAdb?"1":"0");
}
}
@Override
publicvoidrun(){
EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_SYSTEM_RUN,
SystemClock.uptimeMillis());
Looper.prepare();
android.os.Process.setThreadPriority(
android.os.Process.THREAD_PRIORITY_FOREGROUND);
BinderInternal.disableBackgroundScheduling(true);
android.os.Process.setCanSelfBackground(false);
//Checkwhetherwefailedtoshutdownlasttimewetried.
{
finalStringshutdownAction=SystemProperties.get(
ShutdownThread.SHUTDOWN_ACTION_PROPERTY,"");
if(shutdownAction!=null&&shutdownAction.length()>0){
booleanreboot=(shutdownAction.charAt(0)=='1');
finalStringreason;
if(shutdownAction.length()>1){
reason=shutdownAction.substring(1,shutdownAction.length());
}else{
reason=null;
}
ShutdownThread.rebootOrShutdown(reboot,reason);
}
}
StringfactoryTestStr=SystemProperties.get("ro.factorytest");
intfactoryTest="".equals(factoryTestStr)?SystemServer.FACTORY_TEST_OFF
:Integer.parseInt(factoryTestStr);
LightsServicelights=null;
PowerManagerServicepower=null;
BatteryServicebattery=null;
ConnectivityServiceconnectivity=null;
IPackageManagerpm=null;
Contextcontext=null;
WindowManagerServicewm=null;
BluetoothServicebluetooth=null;
BluetoothA2dpServicebluetoothA2dp=null;
HeadsetObserverheadset=null;
DockObserverdock=null;
UsbServiceusb=null;
UiModeManagerServiceuiMode=null;
RecognitionManagerServicerecognition=null;
ThrottleServicethrottle=null;
//Criticalservices...
try{
//EntropyService服务
Slog.i(TAG,"EntropyService");
ServiceManager.addService("entropy",newEntropyService());
//电源管理服务
Slog.i(TAG,"PowerManager");
power=newPowerManagerService();
ServiceManager.addService(Context.POWER_SERVICE,power);
//ActivityManagerService服务
Slog.i(TAG,"ActivityManager");
context=ActivityManagerService.main(factoryTest);
//TelephonyRegistry服务
Slog.i(TAG,"TelephonyRegistry");
ServiceManager.addService("telephony.registry",newTelephonyRegistry(context));
AttributeCache.init(context);
//PackageManagerService包管理服务
Slog.i(TAG,"PackageManager");
pm=PackageManagerService.main(context,
factoryTest!=SystemServer.FACTORY_TEST_OFF);
ActivityManagerService.setSystemProcess();
//内容解决者
mContentResolver=context.getContentResolver();
//账号、密码、权限管理服务
//TheAccountManagermustcomebeforetheContentService
try{
Slog.i(TAG,"AccountManager");
ServiceManager.addService(Context.ACCOUNT_SERVICE,
newAccountManagerService(context));
}catch(Throwablee){
Slog.e(TAG,"FailurestartingAccountManager",e);
}
//内容服务
Slog.i(TAG,"ContentManager");
ContentService.main(context,
factoryTest==SystemServer.FACTORY_TEST_LOW_LEVEL);
//内容提供者
Slog.i(TAG,"SystemContentProviders");
ActivityManagerService.installSystemProviders();
//电池服务
Slog.i(TAG,"BatteryService");
battery=newBatteryService(context);
ServiceManager.addService("battery",battery);
//亮屏服务
Slog.i(TAG,"LightsService");
lights=newLightsService(context);
//手机震动服务
Slog.i(TAG,"VibratorService");
ServiceManager.addService("vibrator",newVibratorService(context));
//在开始亮屏服务、内容提供者服务、电池服务启动后，才初始化电源服务
//onlyinitializethepowerserviceafterwehavestartedthe
//lightsservice,contentprovidersandthebatteryservice.
power.init(context,lights,ActivityManagerService.getDefault(),battery);
//闹钟服务
Slog.i(TAG,"AlarmManager");
AlarmManagerServicealarm=newAlarmManagerService(context);
ServiceManager.addService(Context.ALARM_SERVICE,alarm);
//初始化看门狗
Slog.i(TAG,"InitWatchdog");
Watchdog.getInstance().init(context,battery,power,alarm,
ActivityManagerService.self());
//窗口管理服务
Slog.i(TAG,"WindowManager");
wm=WindowManagerService.main(context,power,
factoryTest!=SystemServer.FACTORY_TEST_LOW_LEVEL);
ServiceManager.addService(Context.WINDOW_SERVICE,wm);
((ActivityManagerService)ServiceManager.getService("activity"))
.setWindowManager(wm);
//蓝牙服务
//SkipBluetoothifwehaveanemulatorkernel
//TODO:Useamorereliablechecktoseeifthisproductshould
//supportBluetooth-seebug988521
if(SystemProperties.get("ro.kernel.qemu").equals("1")){
Slog.i(TAG,"RegisteringnullBluetoothService(emulator)");
ServiceManager.addService(BluetoothAdapter.BLUETOOTH_SERVICE,null);
}elseif(factoryTest==SystemServer.FACTORY_TEST_LOW_LEVEL){
Slog.i(TAG,"RegisteringnullBluetoothService(factorytest)");
ServiceManager.addService(BluetoothAdapter.BLUETOOTH_SERVICE,null);
}else{
Slog.i(TAG,"BluetoothService");
bluetooth=newBluetoothService(context);
ServiceManager.addService(BluetoothAdapter.BLUETOOTH_SERVICE,bluetooth);
bluetooth.initAfterRegistration();
bluetoothA2dp=newBluetoothA2dpService(context,bluetooth);
ServiceManager.addService(BluetoothA2dpService.BLUETOOTH_A2DP_SERVICE,
bluetoothA2dp);
intbluetoothOn=Settings.Secure.getInt(mContentResolver,
Settings.Secure.BLUETOOTH_ON,0);
if(bluetoothOn>0){
bluetooth.enable();
}
}
}catch(RuntimeExceptione){
Slog.e("System","Failurestartingcoreservice",e);
}
DevicePolicyManagerServicedevicePolicy=null;
StatusBarManagerServicestatusBar=null;
InputMethodManagerServiceimm=null;
AppWidgetServiceappWidget=null;
NotificationManagerServicenotification=null;
WallpaperManagerServicewallpaper=null;
LocationManagerServicelocation=null;
if(factoryTest!=SystemServer.FACTORY_TEST_LOW_LEVEL){
try{
Slog.i(TAG,"DevicePolicy");
devicePolicy=newDevicePolicyManagerService(context);
ServiceManager.addService(Context.DEVICE_POLICY_SERVICE,devicePolicy);
}catch(Throwablee){
Slog.e(TAG,"FailurestartingDevicePolicyService",e);
}
try{
Slog.i(TAG,"StatusBar");
statusBar=newStatusBarManagerService(context);
ServiceManager.addService(Context.STATUS_BAR_SERVICE,statusBar);
}catch(Throwablee){
Slog.e(TAG,"FailurestartingStatusBarManagerService",e);
}
try{
Slog.i(TAG,"ClipboardService");
ServiceManager.addService(Context.CLIPBOARD_SERVICE,
newClipboardService(context));
}catch(Throwablee){
Slog.e(TAG,"FailurestartingClipboardService",e);
}
//输入法管理服务
try{
Slog.i(TAG,"InputMethodService");
imm=newInputMethodManagerService(context,statusBar);
ServiceManager.addService(Context.INPUT_METHOD_SERVICE,imm);
}catch(Throwablee){
Slog.e(TAG,"FailurestartingInputManagerService",e);
}
//网络状态服务
try{
Slog.i(TAG,"NetStatService");
ServiceManager.addService("netstat",newNetStatService(context));
}catch(Throwablee){
Slog.e(TAG,"FailurestartingNetStatService",e);
}
//网络管理服务
try{
Slog.i(TAG,"NetworkManagementService");
ServiceManager.addService(
Context.NETWORKMANAGEMENT_SERVICE,
NetworkManagementService.create(context));
}catch(Throwablee){
Slog.e(TAG,"FailurestartingNetworkManagementService",e);
}
//网络连接服务
try{
Slog.i(TAG,"ConnectivityService");
connectivity=ConnectivityService.getInstance(context);
ServiceManager.addService(Context.CONNECTIVITY_SERVICE,connectivity);
}catch(Throwablee){
Slog.e(TAG,"FailurestartingConnectivityService",e);
}
//节流阀控制，提高modem使用效率，避免数据过大或过小情况下不必要的重复连接和断开。
try{
Slog.i(TAG,"ThrottleService");
throttle=newThrottleService(context);
ServiceManager.addService(
Context.THROTTLE_SERVICE,throttle);
}catch(Throwablee){
Slog.e(TAG,"FailurestartingThrottleService",e);
}
//可访问管理服务
try{
Slog.i(TAG,"AccessibilityManager");
ServiceManager.addService(Context.ACCESSIBILITY_SERVICE,
newAccessibilityManagerService(context));
}catch(Throwablee){
Slog.e(TAG,"FailurestartingAccessibilityManager",e);
}
//磁盘加载服务(sd卡等)
try{
/*
*NotificationManagerServiceisdependantonMountService,
*(formedia/usbnotifications)sowemuststartMountServicefirst.
*/
Slog.i(TAG,"MountService");
ServiceManager.addService("mount",newMountService(context));
}catch(Throwablee){
Slog.e(TAG,"FailurestartingMountService",e);
}
//通知管理服务
try{
Slog.i(TAG,"NotificationManager");
notification=newNotificationManagerService(context,statusBar,lights);
ServiceManager.addService(Context.NOTIFICATION_SERVICE,notification);
}catch(Throwablee){
Slog.e(TAG,"FailurestartingNotificationManager",e);
}
//监控磁盘空间服务
try{
Slog.i(TAG,"DeviceStorageMonitor");
ServiceManager.addService(DeviceStorageMonitorService.SERVICE,
newDeviceStorageMonitorService(context));
}catch(Throwablee){
Slog.e(TAG,"FailurestartingDeviceStorageMonitorservice",e);
}
//定位管理服务
try{
Slog.i(TAG,"LocationManager");
location=newLocationManagerService(context);
ServiceManager.addService(Context.LOCATION_SERVICE,location);
}catch(Throwablee){
Slog.e(TAG,"FailurestartingLocationManager",e);
}
//搜索管理服务
try{
Slog.i(TAG,"SearchService");
ServiceManager.addService(Context.SEARCH_SERVICE,
newSearchManagerService(context));
}catch(Throwablee){
Slog.e(TAG,"FailurestartingSearchService",e);
}
//开启守护进程
if(INCLUDE_DEMO){
Slog.i(TAG,"Installingdemodata...");
(newDemoThread(context)).start();
}
//DropBoxManagerService用于生成和管理系统运行时的一些日志文件。这些日志文件大多记录的是系统或某个应用程序出错时的信息。
try{
Slog.i(TAG,"DropBoxService");
ServiceManager.addService(Context.DROPBOX_SERVICE,
newDropBoxManagerService(context,newFile("/data/system/dropbox")));
}catch(Throwablee){
Slog.e(TAG,"FailurestartingDropBoxManagerService",e);
}
//壁纸管理服务
try{
Slog.i(TAG,"WallpaperService");
wallpaper=newWallpaperManagerService(context);
ServiceManager.addService(Context.WALLPAPER_SERVICE,wallpaper);
}catch(Throwablee){
Slog.e(TAG,"FailurestartingWallpaperService",e);
}
//音频服务
try{
Slog.i(TAG,"AudioService");
ServiceManager.addService(Context.AUDIO_SERVICE,newAudioService(context));
}catch(Throwablee){
Slog.e(TAG,"FailurestartingAudioService",e);
}
//HeadsetObserver耳机监听
try{
Slog.i(TAG,"HeadsetObserver");
//Listenforwiredheadsetchanges
headset=newHeadsetObserver(context);
}catch(Throwablee){
Slog.e(TAG,"FailurestartingHeadsetObserver",e);
}
//DockObserver手机亮度的监听
try{
Slog.i(TAG,"DockObserver");
//Listenfordockstationchanges
dock=newDockObserver(context,power);
}catch(Throwablee){
Slog.e(TAG,"FailurestartingDockObserver",e);
}
//usb服务
try{
Slog.i(TAG,"USBService");
//ListenforUSBchanges
usb=newUsbService(context);
ServiceManager.addService(Context.USB_SERVICE,usb);
}catch(Throwablee){
Slog.e(TAG,"FailurestartingUsbService",e);
}
//ui模式管理服务
try{
Slog.i(TAG,"UIModeManagerService");
//ListenforUImodechanges
uiMode=newUiModeManagerService(context);
}catch(Throwablee){
Slog.e(TAG,"FailurestartingUiModeManagerService",e);
}
//备份管理服务
try{
Slog.i(TAG,"BackupService");
ServiceManager.addService(Context.BACKUP_SERVICE,
newBackupManagerService(context));
}catch(Throwablee){
Slog.e(TAG,"FailurestartingBackupService",e);
}
//appWidget服务
try{
Slog.i(TAG,"AppWidgetService");
appWidget=newAppWidgetService(context);
ServiceManager.addService(Context.APPWIDGET_SERVICE,appWidget);
}catch(Throwablee){
Slog.e(TAG,"FailurestartingAppWidgetService",e);
}
try{
Slog.i(TAG,"RecognitionService");
recognition=newRecognitionManagerService(context);
}catch(Throwablee){
Slog.e(TAG,"FailurestartingRecognitionService",e);
}
try{
Slog.i(TAG,"DiskStatsService");
ServiceManager.addService("diskstats",newDiskStatsService(context));
}catch(Throwablee){
Slog.e(TAG,"FailurestartingDiskStatsService",e);
}
}
//makesuretheADB_ENABLEDsettingvaluematchesthesecurepropertyvalue
Settings.Secure.putInt(mContentResolver,Settings.Secure.ADB_ENABLED,
"1".equals(SystemProperties.get("persist.service.adb.enable"))?1:0);
//registerobservertolistenforsettingschanges
mContentResolver.registerContentObserver(Settings.Secure.getUriFor(Settings.Secure.ADB_ENABLED),
false,newAdbSettingsObserver());
//Beforethingsstartrolling,besurewehavedecidedwhether
//weareinsafemode.
finalbooleansafeMode=wm.detectSafeMode();
if(safeMode){
try{
ActivityManagerNative.getDefault().enterSafeMode();
//PostthesafemodestateintheZygoteclass
Zygote.systemInSafeMode=true;
//DisabletheJITforthesystem_serverprocess
VMRuntime.getRuntime().disableJitCompilation();
}catch(RemoteExceptione){
}
}else{
//EnabletheJITforthesystem_serverprocess
VMRuntime.getRuntime().startJitCompilation();
}
//Itisnowtimetostartuptheappprocesses...
if(devicePolicy!=null){
devicePolicy.systemReady();
}
if(notification!=null){
notification.systemReady();
}
if(statusBar!=null){
statusBar.systemReady();
}
wm.systemReady();
power.systemReady();
try{
pm.systemReady();
}catch(RemoteExceptione){
}
//Theseareneededtopropagatetotherunnablebelow.
finalStatusBarManagerServicestatusBarF=statusBar;
finalBatteryServicebatteryF=battery;
finalConnectivityServiceconnectivityF=connectivity;
finalDockObserverdockF=dock;
finalUsbServiceusbF=usb;
finalThrottleServicethrottleF=throttle;
finalUiModeManagerServiceuiModeF=uiMode;
finalAppWidgetServiceappWidgetF=appWidget;
finalWallpaperManagerServicewallpaperF=wallpaper;
finalInputMethodManagerServiceimmF=imm;
finalRecognitionManagerServicerecognitionF=recognition;
finalLocationManagerServicelocationF=location;
//Wenowtelltheactivitymanageritisokaytorunthirdparty
//code.Itwillcallbackintousonceithasgottentothestate
//wherethirdpartycodecanreallyrun(butbeforeithasactually
//startedlaunchingtheinitialapplications),forustocompleteour
//initialization.
((ActivityManagerService)ActivityManagerNative.getDefault())
.systemReady(newRunnable(){
publicvoidrun(){
Slog.i(TAG,"Makingservicesready");
if(statusBarF!=null)statusBarF.systemReady2();
if(batteryF!=null)batteryF.systemReady();
if(connectivityF!=null)connectivityF.systemReady();
if(dockF!=null)dockF.systemReady();
if(usbF!=null)usbF.systemReady();
if(uiModeF!=null)uiModeF.systemReady();
if(recognitionF!=null)recognitionF.systemReady();
Watchdog.getInstance().start();
//Itisnowokaytoletthevarioussystemservicesstarttheir
//thirdpartycode...
if(appWidgetF!=null)appWidgetF.systemReady(safeMode);
if(wallpaperF!=null)wallpaperF.systemReady();
if(immF!=null)immF.systemReady();
if(locationF!=null)locationF.systemReady();
if(throttleF!=null)throttleF.systemReady();
}
});
//Fordebugbuilds,logeventloopstallstodropboxforanalysis.
if(StrictMode.conditionallyEnableDebugLogging()){
Slog.i(TAG,"EnabledStrictModeforsystemservermainthread.");
}
Looper.loop();
Slog.d(TAG,"SystemServerThreadisexiting!");
}
}

这个函数除了启动了很多系统服务，自己慢慢研究

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