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Android System Server进程源码分析下

2016-11-15 20:00 447 查看

一 System Server

上篇分析了Zygote创建SystemServer的流程，本篇则分析SystemServer的实际工作内容。

1.0 main

public static void main(String[] args) {
new SystemServer().run(); // 先new一个SystemServer对象，然后调用它的run()方法
}

Java中start方法与run方法的区别：
调用start方法会创建一个新线程，并且run方法中的代码在新的线程上运行。
调用run方法的不会创建新线程，run方法中的代码继续在当前线程上运行。

1.1 run

private void run() {
try {
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "InitBeforeStartServices"); // 启动Systrace追踪InitBeforeStartServices
// If a device's clock is before 1970 (before 0), a lot of
// APIs crash dealing with negative numbers, notably
// java.io.File#setLastModified, so instead we fake it and
// hope that time from cell towers or NTP fixes it shortly.
if (System.currentTimeMillis() < EARLIEST_SUPPORTED_TIME) { // 类UNIX系统时间最早从1970开始计算
Slog.w(TAG, "System clock is before 1970; setting to 1970.");
SystemClock.setCurrentTimeMillis(EARLIEST_SUPPORTED_TIME);
}

// If the system has "persist.sys.language" and friends set, replace them with
// "persist.sys.locale". Note that the default locale at this point is calculated
// using the "-Duser.locale" command line flag. That flag is usually populated by
// AndroidRuntime using the same set of system properties, but only the system_server
// and system apps are allowed to set them.
//
// NOTE: Most changes made here will need an equivalent change to
// core/jni/AndroidRuntime.cpp
if (!SystemProperties.get("persist.sys.language").isEmpty()) {
final String languageTag = Locale.getDefault().toLanguageTag(); // 本地化

SystemProperties.set("persist.sys.locale", languageTag); // persist.sys.locale=zh-CN

SystemProperties.set("persist.sys.language", "");
SystemProperties.set("persist.sys.country", "");
SystemProperties.set("persist.sys.localevar", "");
}

// Here we go!
Slog.i(TAG, "Entered the Android system server!");
EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_SYSTEM_RUN, SystemClock.uptimeMillis()); // Android时间日志

// In case the runtime switched since last boot (such as when
// the old runtime was removed in an OTA), set the system
// property so that it is in sync. We can't do this in
// libnativehelper's JniInvocation::Init code where we already
// had to fallback to a different runtime because it is
// running as root and we need to be the system user to set
// the property. http://b/11463182 SystemProperties.set("persist.sys.dalvik.vm.lib.2", VMRuntime.getRuntime().vmLibrary()); // 虚拟机库文件 // VMRuntime_vmLibrary返回libart.so

// Enable the sampling profiler.
if (SamplingProfilerIntegration.isEnabled()) {
SamplingProfilerIntegration.start(); // 启动SamplingProfilerIntegration进行性能统计
mProfilerSnapshotTimer = new Timer();
mProfilerSnapshotTimer.schedule(new TimerTask() {
@Override
public void run() {
SamplingProfilerIntegration.writeSnapshot("system_server", null);
}
}, SNAPSHOT_INTERVAL, SNAPSHOT_INTERVAL); // 每隔1小时调用一次，将结果保存到/data/snapshots/system_server
}

// Mmmmmm... more memory!
VMRuntime.getRuntime().clearGrowthLimit();   // 清除虚拟机运行时内存增长上限

// The system server has to run all of the time, so it needs to be
// as efficient as possible with its memory usage.
VMRuntime.getRuntime().setTargetHeapUtilization(0.8f); // 设置虚拟机运行时的内存堆的利用率为0.8

// Some devices rely on runtime fingerprint generation, so make sure
// we've defined it before booting further.
Build.ensureFingerprintProperty(); // 设置ro.build.fingerprint属性值

// Within the system server, it is an error to access Environment paths without
// explicitly specifying a user.
Environment.setUserRequired(true); // 设置必须指定用户后才可以访问环境变量

// Ensure binder calls into the system always run at foreground priority.
BinderInternal.disableBackgroundScheduling(true); // 确保binder系统调用，总是运行在前台优先级

// Prepare the main looper thread (this thread).
android.os.Process.setThreadPriority(
android.os.Process.THREAD_PRIORITY_FOREGROUND); // 设置system_server进程的优先级为前台优先级
android.os.Process.setCanSelfBackground(false); // 禁止system_server自行将自己设为后台进程
Looper.prepareMainLooper(); // 创建主线程Looper

// Initialize native services.
System.loadLibrary("android_servers"); //加载android_servers.so动态库

// Check whether we failed to shut down last time we tried.
// This call may not return.
performPendingShutdown(); // 获取sys.shutdown.requested属性，判断是否需要关机或重启，如果是的话则执行相应操作

// Initialize the system context.
createSystemContext(); // 初始化系统上下文

// Create the system service manager.
mSystemServiceManager = new SystemServiceManager(mSystemContext); // 创建系统服务管理对象
LocalServices.addService(SystemServiceManager.class, mSystemServiceManager); // //将mSystemServiceManager添加到本地服务的ArrayMap中
} finally {
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER); // 停止Systrace追踪InitBeforeStartServices
}

// Start services.
try {
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "StartServices"); // 启动Systrace追踪StartServices
startBootstrapServices(); // 启动引导服务
startCoreServices(); // 启动核心服务
startOtherServices(); // 启动其他服务
} catch (Throwable ex) {
Slog.e("System", "******************************************");
Slog.e("System", "************ Failure starting system services", ex);
throw ex;
} finally {
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER); // 停止Systrace追踪StartServices
}

// For debug builds, log event loop stalls to dropbox for analysis.
if (StrictMode.conditionallyEnableDebugLogging()) { // 严格模式，用于调试
Slog.i(TAG, "Enabled StrictMode for system server main thread.");
}

// Loop forever.
Looper.loop(); // 一直循环，获取并处理消息
throw new RuntimeException("Main thread loop unexpectedly exited");
}

1.3 createSystemContext

private void createSystemContext() {
ActivityThread activityThread = ActivityThread.systemMain(); // 创建ActivityThread对象
mSystemContext = activityThread.getSystemContext(); // 创建并获取ContextImpl
mSystemContext.setTheme(android.R.style.Theme_DeviceDefault_Light_DarkActionBar); // 设置系统主题
}

1.4 startBootstrapServices

private void startBootstrapServices() {
// Wait for installd to finish starting up so that it has a chance to
// create critical directories such as /data/user with the appropriate
// permissions. We need this to complete before we initialize other services.
Installer installer = mSystemServiceManager.startService(Installer.class); // 启动Installer系统服务，并等待和installd建立socket连接

// Activity manager runs the show.
mActivityManagerService = mSystemServiceManager.startService(
ActivityManagerService.Lifecycle.class).getService(); //启动ActivityManagerService系统服务
mActivityManagerService.setSystemServiceManager(mSystemServiceManager); // 设置ActivityManagerService的SystemServiceManager
mActivityManagerService.setInstaller(installer); // 设置ActivityManagerService的Installer

// Power manager needs to be started early because other services need it.
// Native daemons may be watching for it to be registered so it must be ready
// to handle incoming binder calls immediately (including being able to verify
// the permissions for those calls).
mPowerManagerService = mSystemServiceManager.startService(PowerManagerService.class); // 启动PowerManagerService系统服务

// Now that the power manager has been started, let the activity manager
// initialize power management features.
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "InitPowerManagement");
mActivityManagerService.initPowerManagement(); // 初始化PowerManagement
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

// Manages LEDs and display backlight so we need it to bring up the display.
mSystemServiceManager.startService(LightsService.class); // 启动LightsService系统服务

// Display manager is needed to provide display metrics before package manager
// starts up.
mDisplayManagerService = mSystemServiceManager.startService(DisplayManagerService.class); // 启动DisplayManagerService系统服务

// We need the default display before we can initialize the package manager.
mSystemServiceManager.startBootPhase(SystemService.PHASE_WAIT_FOR_DEFAULT_DISPLAY); // 等待Display有默认显示 // 调用DisplayManagerService的onBootPhase方法

// Only run "core" apps if we're encrypting the device.
String cryptState = SystemProperties.get("vold.decrypt"); // 当设备正在加密时，仅运行核心应用程序
if (ENCRYPTING_STATE.equals(cryptState)) {
Slog.w(TAG, "Detected encryption in progress - only parsing core apps");
mOnlyCore = true;
} else if (ENCRYPTED_STATE.equals(cryptState)) {
Slog.w(TAG, "Device encrypted - only parsing core apps");
mOnlyCore = true;
}

// Start the package manager.
traceBeginAndSlog("StartPackageManagerService");
mPackageManagerService = PackageManagerService.main(mSystemContext, installer,
mFactoryTestMode != FactoryTest.FACTORY_TEST_OFF, mOnlyCore); // 启动PackageManagerService系统服务
mFirstBoot = mPackageManagerService.isFirstBoot(); // 是否是第一次开机
mPackageManager = mSystemContext.getPackageManager();
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

traceBeginAndSlog("StartUserManagerService");
ServiceManager.addService(Context.USER_SERVICE, UserManagerService.getInstance());  // 启动UserManagerService系统服务，并将其注册到ServiceManager
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

// Initialize attribute cache used to cache resources from packages.
AttributeCache.init(mSystemContext); // 初始化属性缓存

// Set up the Application instance for the system process and get started.
mActivityManagerService.setSystemProcess(); // 先将ActivityManagerService注册到ServiceManager，然后向SystemManager注册几个其他服务，最后创建了一个代表system_server的ProcessRecord对象

// The sensor service needs access to package manager service, app ops
// service, and permissions service, therefore we start it after them.
startSensorService();  // 启动传感器系统服务
}

1.5 startCoreServices

private void startCoreServices() {
// Tracks the battery level. Requires LightService.
mSystemServiceManager.startService(BatteryService.class); // 启动BatteryService系统服务，用于统计电池电量信息

// Tracks application usage stats.
mSystemServiceManager.startService(UsageStatsService.class); // 启动UsageStatsService系统服务，用于统计应用使用情况
mActivityManagerService.setUsageStatsManager(
LocalServices.getService(UsageStatsManagerInternal.class));
// Update after UsageStatsService is available, needed before performBootDexOpt.
mPackageManagerService.getUsageStatsIfNoPackageUsageInfo();

// Tracks whether the updatable WebView is in a ready state and watches for update installs.
mSystemServiceManager.startService(WebViewUpdateService.class); // 启动WebViewUpdateService系统服务
}

1.6 startOtherServices

启动一系列的服务，过于繁杂就不分析了。

private void startOtherServices() {
final Context context = mSystemContext;
AccountManagerService accountManager = null;
ContentService contentService = null;
VibratorService vibrator = null;
IAlarmManager alarm = null;
IMountService mountService = null;
NetworkManagementService networkManagement = null;
NetworkStatsService networkStats = null;
NetworkPolicyManagerService networkPolicy = null;
ConnectivityService connectivity = null;
NetworkScoreService networkScore = null;
NsdService serviceDiscovery= null;
WindowManagerService wm = null;
UsbService usb = null;
SerialService serial = null;
NetworkTimeUpdateService networkTimeUpdater = null;
CommonTimeManagementService commonTimeMgmtService = null;
InputManagerService inputManager = null;
TelephonyRegistry telephonyRegistry = null;
ConsumerIrService consumerIr = null;
AudioService audioService = null;
MmsServiceBroker mmsService = null;
EntropyMixer entropyMixer = null;
CameraService cameraService = null;

boolean disableStorage = SystemProperties.getBoolean("config.disable_storage", false);
boolean disableBluetooth = SystemProperties.getBoolean("config.disable_bluetooth", false);
boolean disableLocation = SystemProperties.getBoolean("config.disable_location", false);
boolean disableSystemUI = SystemProperties.getBoolean("config.disable_systemui", false);
boolean disableNonCoreServices = SystemProperties.getBoolean("config.disable_noncore", false);
boolean disableNetwork = SystemProperties.getBoolean("config.disable_network", false);
boolean disableNetworkTime = SystemProperties.getBoolean("config.disable_networktime", false);
boolean isEmulator = SystemProperties.get("ro.kernel.qemu").equals("1");

try {
Slog.i(TAG, "Reading configuration...");
SystemConfig.getInstance();

traceBeginAndSlog("StartSchedulingPolicyService");
ServiceManager.addService("scheduling_policy", new SchedulingPolicyService());
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

mSystemServiceManager.startService(TelecomLoaderService.class);

traceBeginAndSlog("StartTelephonyRegistry");
telephonyRegistry = new TelephonyRegistry(context);
ServiceManager.addService("telephony.registry", telephonyRegistry);
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

traceBeginAndSlog("StartEntropyMixer");
entropyMixer = new EntropyMixer(context);
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

mContentResolver = context.getContentResolver();

Slog.i(TAG, "Camera Service");
mSystemServiceManager.startService(CameraService.class);

// The AccountManager must come before the ContentService
traceBeginAndSlog("StartAccountManagerService");
try {
// TODO: seems like this should be disable-able, but req'd by ContentService
accountManager = new AccountManagerService(context);
ServiceManager.addService(Context.ACCOUNT_SERVICE, accountManager);
} catch (Throwable e) {
Slog.e(TAG, "Failure starting Account Manager", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

traceBeginAndSlog("StartContentService");
contentService = ContentService.main(context,
mFactoryTestMode == FactoryTest.FACTORY_TEST_LOW_LEVEL);
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

traceBeginAndSlog("InstallSystemProviders");
mActivityManagerService.installSystemProviders();
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

traceBeginAndSlog("StartVibratorService");
vibrator = new VibratorService(context);
ServiceManager.addService("vibrator", vibrator);
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

traceBeginAndSlog("StartConsumerIrService");
consumerIr = new ConsumerIrService(context);
ServiceManager.addService(Context.CONSUMER_IR_SERVICE, consumerIr);
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

mSystemServiceManager.startService(AlarmManagerService.class);
alarm = IAlarmManager.Stub.asInterface(
ServiceManager.getService(Context.ALARM_SERVICE));

traceBeginAndSlog("InitWatchdog");
final Watchdog watchdog = Watchdog.getInstance();
watchdog.init(context, mActivityManagerService);
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

traceBeginAndSlog("StartInputManagerService");
inputManager = new InputManagerService(context);
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

traceBeginAndSlog("StartWindowManagerService");
wm = WindowManagerService.main(context, inputManager,
mFactoryTestMode != FactoryTest.FACTORY_TEST_LOW_LEVEL,
!mFirstBoot, mOnlyCore);
ServiceManager.addService(Context.WINDOW_SERVICE, wm);
ServiceManager.addService(Context.INPUT_SERVICE, inputManager);
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

mActivityManagerService.setWindowManager(wm);

inputManager.setWindowManagerCallbacks(wm.getInputMonitor());
inputManager.start();

// TODO: Use service dependencies instead.
mDisplayManagerService.windowManagerAndInputReady();

// Skip Bluetooth if we have an emulator kernel
// TODO: Use a more reliable check to see if this product should
// support Bluetooth - see bug 988521
if (isEmulator) {
Slog.i(TAG, "No Bluetooth Service (emulator)");
} else if (mFactoryTestMode == FactoryTest.FACTORY_TEST_LOW_LEVEL) {
Slog.i(TAG, "No Bluetooth Service (factory test)");
} else if (!context.getPackageManager().hasSystemFeature
(PackageManager.FEATURE_BLUETOOTH)) {
Slog.i(TAG, "No Bluetooth Service (Bluetooth Hardware Not Present)");
} else if (disableBluetooth) {
Slog.i(TAG, "Bluetooth Service disabled by config");
} else {
mSystemServiceManager.startService(BluetoothService.class);
}
} catch (RuntimeException e) {
Slog.e("System", "******************************************");
Slog.e("System", "************ Failure starting core service", e);
}

StatusBarManagerService statusBar = null;
INotificationManager notification = null;
InputMethodManagerService imm = null;
WallpaperManagerService wallpaper = null;
LocationManagerService location = null;
CountryDetectorService countryDetector = null;
TextServicesManagerService tsms = null;
LockSettingsService lockSettings = null;
AssetAtlasService atlas = null;
MediaRouterService mediaRouter = null;

// Bring up services needed for UI.
if (mFactoryTestMode != FactoryTest.FACTORY_TEST_LOW_LEVEL) {
traceBeginAndSlog("StartInputMethodManagerService");
try {
imm = new InputMethodManagerService(context, wm);
ServiceManager.addService(Context.INPUT_METHOD_SERVICE, imm);
} catch (Throwable e) {
reportWtf("starting Input Manager Service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

traceBeginAndSlog("StartAccessibilityManagerService");
try {
ServiceManager.addService(Context.ACCESSIBILITY_SERVICE,
new AccessibilityManagerService(context));
} catch (Throwable e) {
reportWtf("starting Accessibility Manager", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

try {
wm.displayReady();
} catch (Throwable e) {
reportWtf("making display ready", e);
}

if (mFactoryTestMode != FactoryTest.FACTORY_TEST_LOW_LEVEL) {
if (!disableStorage &&
!"0".equals(SystemProperties.get("system_init.startmountservice"))) {
try {
/*
* NotificationManagerService is dependant on MountService,
* (for media / usb notifications) so we must start MountService first.
*/
mSystemServiceManager.startService(MOUNT_SERVICE_CLASS);
mountService = IMountService.Stub.asInterface(
ServiceManager.getService("mount"));
} catch (Throwable e) {
reportWtf("starting Mount Service", e);
}
}
}

// We start this here so that we update our configuration to set watch or television
// as appropriate.
mSystemServiceManager.startService(UiModeManagerService.class);

Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "PerformBootDexOpt");
try {
mPackageManagerService.performBootDexOpt();
} catch (Throwable e) {
reportWtf("performing boot dexopt", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

try {
ActivityManagerNative.getDefault().showBootMessage(
context.getResources().getText(
com.android.internal.R.string.android_upgrading_starting_apps),
false);
} catch (RemoteException e) {
}

if (mFactoryTestMode != FactoryTest.FACTORY_TEST_LOW_LEVEL) {
if (!disableNonCoreServices) {
traceBeginAndSlog("StartLockSettingsService");
try {
lockSettings = new LockSettingsService(context);
ServiceManager.addService("lock_settings", lockSettings);
} catch (Throwable e) {
reportWtf("starting LockSettingsService service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

if (!SystemProperties.get(PERSISTENT_DATA_BLOCK_PROP).equals("")) {
mSystemServiceManager.startService(PersistentDataBlockService.class);
}

mSystemServiceManager.startService(DeviceIdleController.class);

// Always start the Device Policy Manager, so that the API is compatible with
// API8.
mSystemServiceManager.startService(DevicePolicyManagerService.Lifecycle.class);
}

if (!disableSystemUI) {
traceBeginAndSlog("StartStatusBarManagerService");
try {
statusBar = new StatusBarManagerService(context, wm);
ServiceManager.addService(Context.STATUS_BAR_SERVICE, statusBar);
} catch (Throwable e) {
reportWtf("starting StatusBarManagerService", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

if (!disableNonCoreServices) {
traceBeginAndSlog("StartClipboardService");
try {
ServiceManager.addService(Context.CLIPBOARD_SERVICE,
new ClipboardService(context));
} catch (Throwable e) {
reportWtf("starting Clipboard Service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

if (!disableNetwork) {
traceBeginAndSlog("StartNetworkManagementService");
try {
networkManagement = NetworkManagementService.create(context);
ServiceManager.addService(Context.NETWORKMANAGEMENT_SERVICE, networkManagement);
} catch (Throwable e) {
reportWtf("starting NetworkManagement Service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

if (!disableNonCoreServices) {
traceBeginAndSlog("StartTextServicesManagerService");
try {
tsms = new TextServicesManagerService(context);
ServiceManager.addService(Context.TEXT_SERVICES_MANAGER_SERVICE, tsms);
} catch (Throwable e) {
reportWtf("starting Text Service Manager Service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

if (!disableNetwork) {
traceBeginAndSlog("StartNetworkScoreService");
try {
networkScore = new NetworkScoreService(context);
ServiceManager.addService(Context.NETWORK_SCORE_SERVICE, networkScore);
} catch (Throwable e) {
reportWtf("starting Network Score Service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

traceBeginAndSlog("StartNetworkStatsService");
try {
networkStats = new NetworkStatsService(context, networkManagement, alarm);
ServiceManager.addService(Context.NETWORK_STATS_SERVICE, networkStats);
} catch (Throwable e) {
reportWtf("starting NetworkStats Service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

traceBeginAndSlog("StartNetworkPolicyManagerService");
try {
networkPolicy = new NetworkPolicyManagerService(
context, mActivityManagerService,
(IPowerManager)ServiceManager.getService(Context.POWER_SERVICE),
networkStats, networkManagement);
ServiceManager.addService(Context.NETWORK_POLICY_SERVICE, networkPolicy);
} catch (Throwable e) {
reportWtf("starting NetworkPolicy Service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

mSystemServiceManager.startService(WIFI_P2P_SERVICE_CLASS);
mSystemServiceManager.startService(WIFI_SERVICE_CLASS);
mSystemServiceManager.startService(
"com.android.server.wifi.WifiScanningService");

mSystemServiceManager.startService("com.android.server.wifi.RttService");

if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_ETHERNET) ||
mPackageManager.hasSystemFeature(PackageManager.FEATURE_USB_HOST)) {
mSystemServiceManager.startService(ETHERNET_SERVICE_CLASS);
}

traceBeginAndSlog("StartConnectivityService");
try {
connectivity = new ConnectivityService(
context, networkManagement, networkStats, networkPolicy);
ServiceManager.addService(Context.CONNECTIVITY_SERVICE, connectivity);
networkStats.bindConnectivityManager(connectivity);
networkPolicy.bindConnectivityManager(connectivity);
} catch (Throwable e) {
reportWtf("starting Connectivity Service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

traceBeginAndSlog("StartNsdService");
try {
serviceDiscovery = NsdService.create(context);
ServiceManager.addService(
Context.NSD_SERVICE, serviceDiscovery);
} catch (Throwable e) {
reportWtf("starting Service Discovery Service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

if (!disableNonCoreServices) {
traceBeginAndSlog("StartUpdateLockService");
try {
ServiceManager.addService(Context.UPDATE_LOCK_SERVICE,
new UpdateLockService(context));
} catch (Throwable e) {
reportWtf("starting UpdateLockService", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

/*
* MountService has a few dependencies: Notification Manager and
* AppWidget Provider. Make sure MountService is completely started
* first before continuing.
*/
if (mountService != null && !mOnlyCore) {
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "WaitForAsecScan");
try {
mountService.waitForAsecScan();
} catch (RemoteException ignored) {
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "MakeAccountManagerServiceReady");
try {
if (accountManager != null)
accountManager.systemReady();
} catch (Throwable e) {
reportWtf("making Account Manager Service ready", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "MakeContentServiceReady");
try {
if (contentService != null)
contentService.systemReady();
} catch (Throwable e) {
reportWtf("making Content Service ready", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

mSystemServiceManager.startService(NotificationManagerService.class);
notification = INotificationManager.Stub.asInterface(
ServiceManager.getService(Context.NOTIFICATION_SERVICE));
networkPolicy.bindNotificationManager(notification);

mSystemServiceManager.startService(DeviceStorageMonitorService.class);

if (!disableLocation) {
traceBeginAndSlog("StartLocationManagerService");
try {
location = new LocationManagerService(context);
ServiceManager.addService(Context.LOCATION_SERVICE, location);
} catch (Throwable e) {
reportWtf("starting Location Manager", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

traceBeginAndSlog("StartCountryDetectorService");
try {
countryDetector = new CountryDetectorService(context);
ServiceManager.addService(Context.COUNTRY_DETECTOR, countryDetector);
} catch (Throwable e) {
reportWtf("starting Country Detector", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

if (!disableNonCoreServices) {
traceBeginAndSlog("StartSearchManagerService");
try {
ServiceManager.addService(Context.SEARCH_SERVICE,
new SearchManagerService(context));
} catch (Throwable e) {
reportWtf("starting Search Service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

traceBeginAndSlog("StartDropBoxManagerService");
try {
ServiceManager.addService(Context.DROPBOX_SERVICE,
new DropBoxManagerService(context, new File("/data/system/dropbox")));
} catch (Throwable e) {
reportWtf("starting DropBoxManagerService", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

if (!disableNonCoreServices && context.getResources().getBoolean(
R.bool.config_enableWallpaperService)) {
traceBeginAndSlog("StartWallpaperManagerService");
try {
wallpaper = new WallpaperManagerService(context);
ServiceManager.addService(Context.WALLPAPER_SERVICE, wallpaper);
} catch (Throwable e) {
reportWtf("starting Wallpaper Service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

traceBeginAndSlog("StartAudioService");
try {
audioService = new AudioService(context);
ServiceManager.addService(Context.AUDIO_SERVICE, audioService);
} catch (Throwable e) {
reportWtf("starting Audio Service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

if (!disableNonCoreServices) {
mSystemServiceManager.startService(DockObserver.class);

if (context.getPackageManager().hasSystemFeature
(PackageManager.FEATURE_WATCH)) {
mSystemServiceManager.startService(ThermalObserver.class);
}
}

traceBeginAndSlog("StartWiredAccessoryManager");
try {
// Listen for wired headset changes
inputManager.setWiredAccessoryCallbacks(
new WiredAccessoryManager(context, inputManager));
} catch (Throwable e) {
reportWtf("starting WiredAccessoryManager", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

if (!disableNonCoreServices) {
if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_MIDI)) {
// Start MIDI Manager service
mSystemServiceManager.startService(MIDI_SERVICE_CLASS);
}

if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_USB_HOST)
|| mPackageManager.hasSystemFeature(
PackageManager.FEATURE_USB_ACCESSORY)) {
// Manage USB host and device support
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "StartUsbService");
mSystemServiceManager.startService(USB_SERVICE_CLASS);
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

traceBeginAndSlog("StartSerialService");
try {
// Serial port support
serial = new SerialService(context);
ServiceManager.addService(Context.SERIAL_SERVICE, serial);
} catch (Throwable e) {
Slog.e(TAG, "Failure starting SerialService", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

mSystemServiceManager.startService(TwilightService.class);

mSystemServiceManager.startService(JobSchedulerService.class);

if (!disableNonCoreServices) {
if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_BACKUP)) {
mSystemServiceManager.startService(BACKUP_MANAGER_SERVICE_CLASS);
}

if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_APP_WIDGETS)) {
mSystemServiceManager.startService(APPWIDGET_SERVICE_CLASS);
}

if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_VOICE_RECOGNIZERS)) {
mSystemServiceManager.startService(VOICE_RECOGNITION_MANAGER_SERVICE_CLASS);
}

if (GestureLauncherService.isGestureLauncherEnabled(context.getResources())) {
Slog.i(TAG, "Gesture Launcher Service");
mSystemServiceManager.startService(GestureLauncherService.class);
}
}

traceBeginAndSlog("StartDiskStatsService");
try {
ServiceManager.addService("diskstats", new DiskStatsService(context));
} catch (Throwable e) {
reportWtf("starting DiskStats Service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

traceBeginAndSlog("StartSamplingProfilerService");
try {
// need to add this service even if SamplingProfilerIntegration.isEnabled()
// is false, because it is this service that detects system property change and
// turns on SamplingProfilerIntegration. Plus, when sampling profiler doesn't work,
// there is little overhead for running this service.
ServiceManager.addService("samplingprofiler",
new SamplingProfilerService(context));
} catch (Throwable e) {
reportWtf("starting SamplingProfiler Service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

if (!disableNetwork && !disableNetworkTime) {
traceBeginAndSlog("StartNetworkTimeUpdateService");
try {
networkTimeUpdater = new NetworkTimeUpdateService(context);
} catch (Throwable e) {
reportWtf("starting NetworkTimeUpdate service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

traceBeginAndSlog("StartCommonTimeManagementService");
try {
commonTimeMgmtService = new CommonTimeManagementService(context);
ServiceManager.addService("commontime_management", commonTimeMgmtService);
} catch (Throwable e) {
reportWtf("starting CommonTimeManagementService service", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

if (!disableNetwork) {
traceBeginAndSlog("CertBlacklister");
try {
CertBlacklister blacklister = new CertBlacklister(context);
} catch (Throwable e) {
reportWtf("starting CertBlacklister", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

if (!disableNonCoreServices) {
// Dreams (interactive idle-time views, a/k/a screen savers, and doze mode)
mSystemServiceManager.startService(DreamManagerService.class);
}

if (!disableNonCoreServices) {
traceBeginAndSlog("StartAssetAtlasService");
try {
atlas = new AssetAtlasService(context);
ServiceManager.addService(AssetAtlasService.ASSET_ATLAS_SERVICE, atlas);
} catch (Throwable e) {
reportWtf("starting AssetAtlasService", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}

if (!disableNonCoreServices) {
ServiceManager.addService(GraphicsStatsService.GRAPHICS_STATS_SERVICE,
new GraphicsStatsService(context));
}

if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_PRINTING)) {
mSystemServiceManager.startService(PRINT_MANAGER_SERVICE_CLASS);
}

mSystemServiceManager.startService(RestrictionsManagerService.class);

mSystemServiceManager.startService(MediaSessionService.class);

if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_HDMI_CEC)) {
mSystemServiceManager.startService(HdmiControlService.class);
}

if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_LIVE_TV)) {
mSystemServiceManager.startService(TvInputManagerService.class);
}

if (!disableNonCoreServices) {
traceBeginAndSlog("StartMediaRouterService");
try {
mediaRouter = new MediaRouterService(context);
ServiceManager.addService(Context.MEDIA_ROUTER_SERVICE, mediaRouter);
} catch (Throwable e) {
reportWtf("starting MediaRouterService", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

mSystemServiceManager.startService(TrustManagerService.class);

mSystemServiceManager.startService(FingerprintService.class);

traceBeginAndSlog("StartBackgroundDexOptService");
try {
BackgroundDexOptService.schedule(context, 0);
} catch (Throwable e) {
reportWtf("starting BackgroundDexOptService", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

}

mSystemServiceManager.startService(LauncherAppsService.class);
}

if (!disableNonCoreServices) {
mSystemServiceManager.startService(MediaProjectionManagerService.class);
}

// Before things start rolling, be sure we have decided whether
// we are in safe mode.
final boolean safeMode = wm.detectSafeMode();
if (safeMode) {
mActivityManagerService.enterSafeMode();
// Disable the JIT for the system_server process
VMRuntime.getRuntime().disableJitCompilation();
} else {
// Enable the JIT for the system_server process
VMRuntime.getRuntime().startJitCompilation();
}

// MMS service broker
mmsService = mSystemServiceManager.startService(MmsServiceBroker.class);

// It is now time to start up the app processes...

Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "MakeVibratorServiceReady");
try {
vibrator.systemReady();
} catch (Throwable e) {
reportWtf("making Vibrator Service ready", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "MakeLockSettingsServiceReady");
if (lockSettings != null) {
try {
lockSettings.systemReady();
} catch (Throwable e) {
reportWtf("making Lock Settings Service ready", e);
}
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

// Needed by DevicePolicyManager for initialization
mSystemServiceManager.startBootPhase(SystemService.PHASE_LOCK_SETTINGS_READY); // 该阶段完成之后，service能获取锁屏设置的数据

mSystemServiceManager.startBootPhase(SystemService.PHASE_SYSTEM_SERVICES_READY); // 该阶段完成之后，service能安全地调用核心系统服务

Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "MakeWindowManagerServiceReady");
try {
wm.systemReady();
} catch (Throwable e) {
reportWtf("making Window Manager Service ready", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

if (safeMode) {
mActivityManagerService.showSafeModeOverlay();
}

// Update the configuration for this context by hand, because we're going
// to start using it before the config change done in wm.systemReady() will
// propagate to it.
Configuration config = wm.computeNewConfiguration();
DisplayMetrics metrics = new DisplayMetrics();
WindowManager w = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
w.getDefaultDisplay().getMetrics(metrics);
context.getResources().updateConfiguration(config, metrics);

// The system context's theme may be configuration-dependent.
final Theme systemTheme = context.getTheme();
if (systemTheme.getChangingConfigurations() != 0) {
systemTheme.rebase();
}

Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "MakePowerManagerServiceReady");
try {
// TODO: use boot phase
mPowerManagerService.systemReady(mActivityManagerService.getAppOpsService());
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
} catch (Throwable e) {
reportWtf("making Power Manager Service ready", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "MakePackageManagerServiceReady");
try {
mPackageManagerService.systemReady();
} catch (Throwable e) {
reportWtf("making Package Manager Service ready", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "MakeDisplayManagerServiceReady");
try {
// TODO: use boot phase and communicate these flags some other way
mDisplayManagerService.systemReady(safeMode, mOnlyCore);
} catch (Throwable e) {
reportWtf("making Display Manager Service ready", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

// These are needed to propagate to the runnable below.
final NetworkManagementService networkManagementF = networkManagement;
final NetworkStatsService networkStatsF = networkStats;
final NetworkPolicyManagerService networkPolicyF = networkPolicy;
final ConnectivityService connectivityF = connectivity;
final NetworkScoreService networkScoreF = networkScore;
final WallpaperManagerService wallpaperF = wallpaper;
final InputMethodManagerService immF = imm;
final LocationManagerService locationF = location;
final CountryDetectorService countryDetectorF = countryDetector;
final NetworkTimeUpdateService networkTimeUpdaterF = networkTimeUpdater;
final CommonTimeManagementService commonTimeMgmtServiceF = commonTimeMgmtService;
final TextServicesManagerService textServiceManagerServiceF = tsms;
final StatusBarManagerService statusBarF = statusBar;
final AssetAtlasService atlasF = atlas;
final InputManagerService inputManagerF = inputManager;
final TelephonyRegistry telephonyRegistryF = telephonyRegistry;
final MediaRouterService mediaRouterF = mediaRouter;
final AudioService audioServiceF = audioService;
final MmsServiceBroker mmsServiceF = mmsService;

// We now tell the activity manager it is okay to run third party
// code. It will call back into us once it has gotten to the state
// where third party code can really run (but before it has actually
// started launching the initial applications), for us to complete our
// initialization.
mActivityManagerService.systemReady(new Runnable() {
@Override
public void run() {
Slog.i(TAG, "Making services ready");
mSystemServiceManager.startBootPhase(
SystemService.PHASE_ACTIVITY_MANAGER_READY); // 该阶段完成之后，service能广播Intent
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "PhaseActivityManagerReady");

Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "StartObservingNativeCrashes");
try {
mActivityManagerService.startObservingNativeCrashes();
} catch (Throwable e) {
reportWtf("observing native crashes", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

Slog.i(TAG, "WebViewFactory preparation");
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "WebViewFactoryPreparation");
WebViewFactory.prepareWebViewInSystemServer();
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "StartSystemUI");
try {
startSystemUi(context);
} catch (Throwable e) {
reportWtf("starting System UI", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "MakeMountServiceReady");
try {
if (networkScoreF != null) networkScoreF.systemReady();
} catch (Throwable e) {
reportWtf("making Network Score Service ready", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "MakeNetworkManagementServiceReady");
try {
if (networkManagementF != null) networkManagementF.systemReady();
} catch (Throwable e) {
reportWtf("making Network Managment Service ready", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "MakeNetworkStatsServiceReady");
try {
if (networkStatsF != null) networkStatsF.systemReady();
} catch (Throwable e) {
reportWtf("making Network Stats Service ready", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "MakeNetworkPolicyServiceReady");
try {
if (networkPolicyF != null) networkPolicyF.systemReady();
} catch (Throwable e) {
reportWtf("making Network Policy Service ready", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "MakeConnectivityServiceReady");
try {
if (connectivityF != null) connectivityF.systemReady();
} catch (Throwable e) {
reportWtf("making Connectivity Service ready", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "MakeAudioServiceReady");
try {
if (audioServiceF != null) audioServiceF.systemReady();
} catch (Throwable e) {
reportWtf("Notifying AudioService running", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
Watchdog.getInstance().start(); // 启动Android Watchdog

// It is now okay to let the various system services start their
// third party code...
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "PhaseThirdPartyAppsCanStart");
mSystemServiceManager.startBootPhase(
SystemService.PHASE_THIRD_PARTY_APPS_CAN_START); // 该阶段完成之后，service能start/bind第三方应用程序

try {
if (wallpaperF != null) wallpaperF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying WallpaperService running", e);
}
try {
if (immF != null) immF.systemRunning(statusBarF);
} catch (Throwable e) {
reportWtf("Notifying InputMethodService running", e);
}
try {
if (locationF != null) locationF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying Location Service running", e);
}
try {
if (countryDetectorF != null) countryDetectorF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying CountryDetectorService running", e);
}
try {
if (networkTimeUpdaterF != null) networkTimeUpdaterF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying NetworkTimeService running", e);
}
try {
if (commonTimeMgmtServiceF != null) {
commonTimeMgmtServiceF.systemRunning();
}
} catch (Throwable e) {
reportWtf("Notifying CommonTimeManagementService running", e);
}
try {
if (textServiceManagerServiceF != null)
textServiceManagerServiceF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying TextServicesManagerService running", e);
}
try {
if (atlasF != null) atlasF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying AssetAtlasService running", e);
}
try {
// TODO(BT) Pass parameter to input manager
if (inputManagerF != null) inputManagerF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying InputManagerService running", e);
}
try {
if (telephonyRegistryF != null) telephonyRegistryF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying TelephonyRegistry running", e);
}
try {
if (mediaRouterF != null) mediaRouterF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying MediaRouterService running", e);
}

try {
if (mmsServiceF != null) mmsServiceF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying MmsService running", e);
}
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}
});
}

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Android System Server进程源码分析 下

Android System Server进程源码分析下