System Server

Android 系统服务进程 system_server，运行着各种服务，比如 PMS, AMS, WMS 等等。该进程是启动时，由 Zygote 启动。

frameworks/base/core/java/com/android/internal/os/ZygoteInit.java

private static Runnable forkSystemServer(String abiList, string socketName,        ZygoteServer zygoteServer) {    ......    String args[] = {        ......        "com.android.server.SystemServer"    };    ......    pid = Zygote.forkSystemServer(...)    if (pid == 0) {        ......        zygoteServer.closeServerSocket();        return handleSystemServerProcess(parsedArgs);    }    return null;}

frameworks/base/services/java/com/android/server/SystemServer.java

public static void main(String[] args) {    new SystemServer().run();}private void run() {    ......    // Initialize native services.    System.loadLibrary("android_servers");    // Check whether we failed to shut down last time.    performPendingShutdown();    // Initialize the system context    createSystemContext();    // Create the system service manager.    mSystemServiceManager = new SystemServiceManager(mSystemContext);    mSystemServiceManager.setStartInfo(...);    LocalServices.addService(SystemServiceManager.class, mSystemServiceManager);    // prepare the thread pool for init tasks that can be parallelized    SystemServerInitThreadPool.get();    // Start services.    try {        traceBeginAndSlog("StartServices");        startBootstrapServices();        startCoreServices();        startOtherServices();        SystemServerInitThreadPool.shutdown();    } catch (Throwable ex) {        ...    } finally {        traceEnd();    }    // Loop forever.    Looper.loop();    throw new RuntimeException("Main thread loop unexpectedly exited");}private void startBootstrapService() {    Installer installer = mSystemServiceManager.startService(Installer.class);    mSystemServiceManager.startService(DevicesIdentifiersPolicyService.class);    mActivityManagerService = mSystemServiceManager.startService(ActivityManagerService.Lifecycle.class).getService();    mActivityManagerService.setSystemServiceManager(mSystemServiceManager);    mActivityManagerService.setInstaller(installer);    mPowerManagerService = mSystemServiceManager.startService(PowerManagerService.class);    mActivityManagerService.initPowerManagement();    mSystemServiceManager.startService(RecoverySystemService.class);    mSystemServiceManager.startService(LisghtService.class);    mDisplayManagerService = mSystemServiceManager.startService(DisplayManagerService.class);    mSYstemServiceManager.startBootPhase(SystemService.PHASE_WAIT_FOR_DEFAULT_DISPLAY);    mPackageManagerService = PackageManagerService.main(...);    mSystemServiceManager.startService(UserManagerService.LifeCycle.class);    ......}private void startCoreService() {    mSystemServiceManager.startService(BatterService.class);    mSystemServiceManager.startService(UsageStatsService.class);    mWebViewUpdateService = mSystemServiceManager.startService(WebViewUpdateService.class);}private void startOtherServices() {    //    VibrateService    IStorageManager    NewWorkManagementService    IpSecService    NetworkStatsService    NetworkPolicyManagerService    ConnectivityService    NsdService    WindowManagerService    SerialService    NetworkTimeUpdateService    CommonTimeManagementService    InputManagerService    TelephonyRegistry    ConsumerIrService    MmsServiceBroker    HardwarePropertiesManagerService}

Android(安卓)System Server

System Server

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