System Server是Android系统的核心,他在Dalvik虚拟机启动后立即开始初始化和运行。其它的系统服务在System Server进程的环境中运行。/base/services/java/com/android/server/SystemServer.java
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native public static void init1(String[] args);
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public static void main(String[] args) {
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if (System.currentTimeMillis() < EARLIEST_SUPPORTED_TIME) {
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Slog.w(TAG, "System clock is before 1970; setting to 1970." );
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SystemClock.setCurrentTimeMillis(EARLIEST_SUPPORTED_TIME);
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}
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if (SamplingProfilerIntegration.isEnabled()) {
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SamplingProfilerIntegration.start();
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timer = new Timer();
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timer.schedule(new TimerTask() {
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@Override
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public void run() {
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SamplingProfilerIntegration.writeSnapshot("system_server" );
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}
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}, SNAPSHOT_INTERVAL, SNAPSHOT_INTERVAL);
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}
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VMRuntime.getRuntime().setTargetHeapUtilization(0 .8f);
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System.loadLibrary("android_servers" );
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init1(args);
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}
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public static final void init2() {
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Slog.i(TAG, "Entered the Android system server!" );
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Thread thr = new ServerThread();
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thr.setName("android.server.ServerThread" );
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thr.start();
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}
在main函数中,首先检查系统时间设置和SamplingProfiler。然后加载一个叫android_servers的本地库,他提供本 地方法的接口(源程序在framework/base/services/jni/目录中)。然后调用本地方法设置服务。具体执行设置的代码在 frameworks/base/cmds/system_server/library/system_init.cpp中。
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extern "C" status_t system_init()
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{
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LOGI("Entered system_init()" );
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sp<ProcessState> proc(ProcessState::self());
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sp<IServiceManager> sm = defaultServiceManager();
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LOGI("ServiceManager: %p\n" , sm.get());
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sp<GrimReaper> grim = new GrimReaper();
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sm->asBinder()->linkToDeath(grim, grim.get(), 0);
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char propBuf[PROPERTY_VALUE_MAX];
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property_get("system_init.startsurfaceflinger" , propBuf, "1" );
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if (strcmp(propBuf, "1" ) == 0) {
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SurfaceFlinger::instantiate();
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}
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SensorService::instantiate();
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if (!proc->supportsProcesses()) {
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AudioFlinger::instantiate();
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MediaPlayerService::instantiate();
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CameraService::instantiate();
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AudioPolicyService::instantiate();
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}
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LOGI("System server: starting Android runtime.\n" );
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AndroidRuntime* runtime = AndroidRuntime::getRuntime();
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LOGI("System server: starting Android services.\n" );
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runtime->callStatic("com/android/server/SystemServer" , "init2" );
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if (proc->supportsProcesses()) {
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LOGI("System server: entering thread pool.\n" );
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ProcessState::self()->startThreadPool();
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IPCThreadState::self()->joinThreadPool();
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LOGI("System server: exiting thread pool.\n" );
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}
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return NO_ERROR;
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}
等初始化传感器,视频,音频等服务后,调用一个回调方法init2 (在SystemServer.java中)。在上面的代码可以看到,这个方法开启了ServerThread来初始化其它的服务。
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public void run() {
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EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_SYSTEM_RUN,
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SystemClock.uptimeMillis());
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Looper.prepare();
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android.os.Process.setThreadPriority(
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android.os.Process.THREAD_PRIORITY_FOREGROUND);
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BinderInternal.disableBackgroundScheduling(true );
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android.os.Process.setCanSelfBackground(false );
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{
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final String shutdownAction = SystemProperties.get(
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ShutdownThread.SHUTDOWN_ACTION_PROPERTY, "" );
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if (shutdownAction != null && shutdownAction.length() > 0 ) {
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boolean reboot = (shutdownAction.charAt( 0 ) == ‘1‘ );
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final String reason;
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if (shutdownAction.length() > 1 ) {
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reason = shutdownAction.substring(1 , shutdownAction.length());
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} else {
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reason = null ;
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}
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ShutdownThread.rebootOrShutdown(reboot, reason);
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}
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}
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String factoryTestStr = SystemProperties.get("ro.factorytest" );
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int factoryTest = "" .equals(factoryTestStr) ? SystemServer.FACTORY_TEST_OFF
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: Integer.parseInt(factoryTestStr);
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LightsService lights = null ;
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PowerManagerService power = null ;
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BatteryService battery = null ;
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ConnectivityService connectivity = null ;
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IPackageManager pm = null ;
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Context context = null ;
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WindowManagerService wm = null ;
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BluetoothService bluetooth = null ;
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BluetoothA2dpService bluetoothA2dp = null ;
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HeadsetObserver headset = null ;
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DockObserver dock = null ;
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UsbService usb = null ;
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UiModeManagerService uiMode = null ;
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RecognitionManagerService recognition = null ;
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ThrottleService throttle = null ;
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try {
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Slog.i(TAG, "Entropy Service" );
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ServiceManager.addService("entropy" , new EntropyService());
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Slog.i(TAG, "Power Manager" );
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power = new PowerManagerService();
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ServiceManager.addService(Context.POWER_SERVICE, power);
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Slog.i(TAG, "Activity Manager" );
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context = ActivityManagerService.main(factoryTest);
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Slog.i(TAG, "Telephony Registry" );
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ServiceManager.addService("telephony.registry" , new TelephonyRegistry(context));
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AttributeCache.init(context);
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Slog.i(TAG, "Package Manager" );
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pm = PackageManagerService.main(context,
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factoryTest != SystemServer.FACTORY_TEST_OFF);
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ActivityManagerService.setSystemProcess();
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mContentResolver = context.getContentResolver();
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try {
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Slog.i(TAG, "Account Manager" );
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ServiceManager.addService(Context.ACCOUNT_SERVICE,
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new AccountManagerService(context));
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting Account Manager" , e);
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}
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Slog.i(TAG, "Content Manager" );
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ContentService.main(context,
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factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL);
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Slog.i(TAG, "System Content Providers" );
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ActivityManagerService.installSystemProviders();
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Slog.i(TAG, "Battery Service" );
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battery = new BatteryService(context);
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ServiceManager.addService("battery" , battery);
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Slog.i(TAG, "Lights Service" );
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lights = new LightsService(context);
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Slog.i(TAG, "Vibrator Service" );
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ServiceManager.addService("vibrator" , new VibratorService(context));
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power.init(context, lights, ActivityManagerService.getDefault(), battery);
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Slog.i(TAG, "Alarm Manager" );
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AlarmManagerService alarm = new AlarmManagerService(context);
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ServiceManager.addService(Context.ALARM_SERVICE, alarm);
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Slog.i(TAG, "Init Watchdog" );
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Watchdog.getInstance().init(context, battery, power, alarm,
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ActivityManagerService.self());
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Slog.i(TAG, "Window Manager" );
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wm = WindowManagerService.main(context, power,
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factoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL);
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ServiceManager.addService(Context.WINDOW_SERVICE, wm);
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((ActivityManagerService)ServiceManager.getService("activity" ))
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.setWindowManager(wm);
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if (SystemProperties.get( "ro.kernel.qemu" ).equals( "1" )) {
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Slog.i(TAG, "Registering null Bluetooth Service (emulator)" );
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ServiceManager.addService(BluetoothAdapter.BLUETOOTH_SERVICE, null );
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} else if (factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL) {
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Slog.i(TAG, "Registering null Bluetooth Service (factory test)" );
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ServiceManager.addService(BluetoothAdapter.BLUETOOTH_SERVICE, null );
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} else {
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Slog.i(TAG, "Bluetooth Service" );
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bluetooth = new BluetoothService(context);
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ServiceManager.addService(BluetoothAdapter.BLUETOOTH_SERVICE, bluetooth);
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bluetooth.initAfterRegistration();
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bluetoothA2dp = new BluetoothA2dpService(context, bluetooth);
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ServiceManager.addService(BluetoothA2dpService.BLUETOOTH_A2DP_SERVICE,
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bluetoothA2dp);
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int bluetoothOn = Settings.Secure.getInt(mContentResolver,
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Settings.Secure.BLUETOOTH_ON, 0 );
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if (bluetoothOn > 0 ) {
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bluetooth.enable();
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}
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}
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} catch (RuntimeException e) {
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Slog.e("System" , "Failure starting core service" , e);
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}
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DevicePolicyManagerService devicePolicy = null ;
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StatusBarManagerService statusBar = null ;
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InputMethodManagerService imm = null ;
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AppWidgetService appWidget = null ;
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NotificationManagerService notification = null ;
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WallpaperManagerService wallpaper = null ;
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LocationManagerService location = null ;
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if (factoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL) {
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try {
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Slog.i(TAG, "Device Policy" );
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devicePolicy = new DevicePolicyManagerService(context);
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ServiceManager.addService(Context.DEVICE_POLICY_SERVICE, devicePolicy);
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting DevicePolicyService" , e);
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}
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try {
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Slog.i(TAG, "Status Bar" );
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statusBar = new StatusBarManagerService(context);
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ServiceManager.addService(Context.STATUS_BAR_SERVICE, statusBar);
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting StatusBarManagerService" , e);
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}
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try {
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Slog.i(TAG, "Clipboard Service" );
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ServiceManager.addService(Context.CLIPBOARD_SERVICE,
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new ClipboardService(context));
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting Clipboard Service" , e);
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}
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try {
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Slog.i(TAG, "Input Method Service" );
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imm = new InputMethodManagerService(context, statusBar);
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ServiceManager.addService(Context.INPUT_METHOD_SERVICE, imm);
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting Input Manager Service" , e);
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}
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try {
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Slog.i(TAG, "NetStat Service" );
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ServiceManager.addService("netstat" , new NetStatService(context));
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting NetStat Service" , e);
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}
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try {
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Slog.i(TAG, "NetworkManagement Service" );
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ServiceManager.addService(
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Context.NETWORKMANAGEMENT_SERVICE,
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NetworkManagementService.create(context));
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting NetworkManagement Service" , e);
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}
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try {
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Slog.i(TAG, "Connectivity Service" );
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connectivity = ConnectivityService.getInstance(context);
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ServiceManager.addService(Context.CONNECTIVITY_SERVICE, connectivity);
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting Connectivity Service" , e);
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}
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try {
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Slog.i(TAG, "Throttle Service" );
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throttle = new ThrottleService(context);
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ServiceManager.addService(
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Context.THROTTLE_SERVICE, throttle);
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting ThrottleService" , e);
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}
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try {
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Slog.i(TAG, "Accessibility Manager" );
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ServiceManager.addService(Context.ACCESSIBILITY_SERVICE,
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new AccessibilityManagerService(context));
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting Accessibility Manager" , e);
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}
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try {
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Slog.i(TAG, "Mount Service" );
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ServiceManager.addService("mount" , new MountService(context));
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting Mount Service" , e);
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}
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try {
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Slog.i(TAG, "Notification Manager" );
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notification = new NotificationManagerService(context, statusBar, lights);
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ServiceManager.addService(Context.NOTIFICATION_SERVICE, notification);
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting Notification Manager" , e);
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}
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try {
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Slog.i(TAG, "Device Storage Monitor" );
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ServiceManager.addService(DeviceStorageMonitorService.SERVICE,
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new DeviceStorageMonitorService(context));
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting DeviceStorageMonitor service" , e);
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}
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try {
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Slog.i(TAG, "Location Manager" );
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location = new LocationManagerService(context);
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ServiceManager.addService(Context.LOCATION_SERVICE, location);
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting Location Manager" , e);
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}
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try {
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Slog.i(TAG, "Search Service" );
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ServiceManager.addService(Context.SEARCH_SERVICE,
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new SearchManagerService(context));
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting Search Service" , e);
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}
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if (INCLUDE_DEMO) {
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Slog.i(TAG, "Installing demo data..." );
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(new DemoThread(context)).start();
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}
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try {
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Slog.i(TAG, "DropBox Service" );
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ServiceManager.addService(Context.DROPBOX_SERVICE,
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new DropBoxManagerService(context, new File( "/data/system/dropbox" )));
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting DropBoxManagerService" , e);
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}
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try {
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Slog.i(TAG, "Wallpaper Service" );
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wallpaper = new WallpaperManagerService(context);
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ServiceManager.addService(Context.WALLPAPER_SERVICE, wallpaper);
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting Wallpaper Service" , e);
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}
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try {
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Slog.i(TAG, "Audio Service" );
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ServiceManager.addService(Context.AUDIO_SERVICE, new AudioService(context));
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting Audio Service" , e);
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}
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try {
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Slog.i(TAG, "Headset Observer" );
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headset = new HeadsetObserver(context);
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting HeadsetObserver" , e);
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}
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try {
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Slog.i(TAG, "Dock Observer" );
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dock = new DockObserver(context, power);
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting DockObserver" , e);
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}
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try {
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Slog.i(TAG, "USB Service" );
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usb = new UsbService(context);
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ServiceManager.addService(Context.USB_SERVICE, usb);
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting UsbService" , e);
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}
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try {
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Slog.i(TAG, "UI Mode Manager Service" );
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uiMode = new UiModeManagerService(context);
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting UiModeManagerService" , e);
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}
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try {
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Slog.i(TAG, "Backup Service" );
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ServiceManager.addService(Context.BACKUP_SERVICE,
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new BackupManagerService(context));
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting Backup Service" , e);
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}
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try {
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Slog.i(TAG, "AppWidget Service" );
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appWidget = new AppWidgetService(context);
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ServiceManager.addService(Context.APPWIDGET_SERVICE, appWidget);
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting AppWidget Service" , e);
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}
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try {
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Slog.i(TAG, "Recognition Service" );
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recognition = new RecognitionManagerService(context);
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting Recognition Service" , e);
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}
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try {
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Slog.i(TAG, "DiskStats Service" );
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ServiceManager.addService("diskstats" , new DiskStatsService(context));
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} catch (Throwable e) {
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Slog.e(TAG, "Failure starting DiskStats Service" , e);
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}
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}
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Settings.Secure.putInt(mContentResolver, Settings.Secure.ADB_ENABLED,
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"1" .equals(SystemProperties.get( "persist.service.adb.enable" )) ? 1 : 0);
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mContentResolver.registerContentObserver(Settings.Secure.getUriFor(Settings.Secure.ADB_ENABLED),
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false , new AdbSettingsObserver());
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final boolean safeMode = wm.detectSafeMode();
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if (safeMode) {
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try {
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ActivityManagerNative.getDefault().enterSafeMode();
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Zygote.systemInSafeMode = true ;
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VMRuntime.getRuntime().disableJitCompilation();
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} catch (RemoteException e) {
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}
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} else {
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VMRuntime.getRuntime().startJitCompilation();
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}
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if (devicePolicy != null ) {
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devicePolicy.systemReady();
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}
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if (notification != null ) {
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notification.systemReady();
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}
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if (statusBar != null ) {
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statusBar.systemReady();
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}
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wm.systemReady();
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power.systemReady();
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try {
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pm.systemReady();
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} catch (RemoteException e) {
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}
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final StatusBarManagerService statusBarF = statusBar;
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final BatteryService batteryF = battery;
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final ConnectivityService connectivityF = connectivity;
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final DockObserver dockF = dock;
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final UsbService usbF = usb;
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final ThrottleService throttleF = throttle;
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final UiModeManagerService uiModeF = uiMode;
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final AppWidgetService appWidgetF = appWidget;
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final WallpaperManagerService wallpaperF = wallpaper;
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final InputMethodManagerService immF = imm;
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final RecognitionManagerService recognitionF = recognition;
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final LocationManagerService locationF = location;
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((ActivityManagerService)ActivityManagerNative.getDefault())
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.systemReady(new Runnable() {
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public void run() {
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Slog.i(TAG, "Making services ready" );
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if (statusBarF != null ) statusBarF.systemReady2();
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if (batteryF != null ) batteryF.systemReady();
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if (connectivityF != null ) connectivityF.systemReady();
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if (dockF != null ) dockF.systemReady();
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if (usbF != null ) usbF.systemReady();
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if (uiModeF != null ) uiModeF.systemReady();
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if (recognitionF != null ) recognitionF.systemReady();
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Watchdog.getInstance().start();
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if (appWidgetF != null ) appWidgetF.systemReady(safeMode);
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if (wallpaperF != null ) wallpaperF.systemReady();
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if (immF != null ) immF.systemReady();
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if (locationF != null ) locationF.systemReady();
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if (throttleF != null ) throttleF.systemReady();
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}
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});
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if (StrictMode.conditionallyEnableDebugLogging()) {
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Slog.i(TAG, "Enabled StrictMode for system server main thread." );
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}
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Looper.loop();
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Slog.d(TAG, "System ServerThread is exiting!" );
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}
这里启动的每一个进程都作为一个Dalvik线程而存在于SystemServer进程里面。



Android systemserver分析ThrottleService 介绍
原文:http://blog.csdn.net/love_xsq/article/details/43791209