Android 服务启动

1.
service zygote /system/bin/app_process -Xzygote /system/bin --zygote --start-system-server ->app_main.cpp
app_process
{
    start VM.
    start Zygote.
}

http://blog.csdn.net/basonjiang_sz/archive/2010/06/23/5690283.aspx

2.frameworks/base/cmds/servicemanager/service_manager.c ->/system/bin/servicemanager
manage all service.adding and getting and listing.

3.frameworks/base/media/mediaserver/main_mediaserver.cpp ->/system/bin/mediaserver
{
    LOGD("##startup [mediaserver]-------------------------------\n");
    sp proc(ProcessState::self());
    sp sm = defaultServiceManager();
    LOGD("ServiceManager: %p", sm.get());
    AudioFlinger::instantiate();
    MediaPlayerService::instantiate();
    CameraService::instantiate();
    AudioPolicyService::instantiate();
    ProcessState::self()->startThreadPool();
    IPCThreadState::self()->joinThreadPool();
}

4. system_init()
I don't know who call the function.
{
 SurfaceFlinger::instantiate();
 SensorService::instantiate();
 runtime->callStatic("com/android/server/SystemServer", "init2");
}
5. runtime->callStatic("com/android/server/SystemServer", "init2");
->  frameworks/base/services/java/com/android/server/SystemServer.java
    public static final void init2() {
        Slog.i(TAG, "Entered the Android system server!");
        Thread thr = new ServerThread();
        thr.setName("android.server.ServerThread");
        thr.start();
    }

// Critical services...
        try {
            Slog.i(TAG, "Entropy Service");
            ServiceManager.addService("entropy", new EntropyService());

            Slog.i(TAG, "Power Manager");
            power = new PowerManagerService();
            ServiceManager.addService(Context.POWER_SERVICE, power);

            Slog.i(TAG, "Activity Manager");
            context = ActivityManagerService.main(factoryTest);

            Slog.i(TAG, "Telephony Registry");
            ServiceManager.addService("telephony.registry", new TelephonyRegistry(context));

            AttributeCache.init(context);

            Slog.i(TAG, "Package Manager");
            pm = PackageManagerService.main(context,
                    factoryTest != SystemServer.FACTORY_TEST_OFF);

            ActivityManagerService.setSystemProcess();

            mContentResolver = context.getContentResolver();

            // The AccountManager must come before the ContentService
            try {
                Slog.i(TAG, "Account Manager");
                ServiceManager.addService(Context.ACCOUNT_SERVICE,
                        new AccountManagerService(context));
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting Account Manager", e);
            }

            Slog.i(TAG, "Content Manager");
            ContentService.main(context,
                    factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL);

            Slog.i(TAG, "System Content Providers");
            ActivityManagerService.installSystemProviders();

            Slog.i(TAG, "Battery Service");
            battery = new BatteryService(context);
            ServiceManager.addService("battery", battery);

            Slog.i(TAG, "Lights Service");
            lights = new LightsService(context);

            Slog.i(TAG, "Vibrator Service");
            ServiceManager.addService("vibrator", new VibratorService(context));

            // only initialize the power service after we have started the
            // lights service, content providers and the battery service.
            power.init(context, lights, ActivityManagerService.getDefault(), battery);

            Slog.i(TAG, "Alarm Manager");
            AlarmManagerService alarm = new AlarmManagerService(context);
            ServiceManager.addService(Context.ALARM_SERVICE, alarm);

            Slog.i(TAG, "Init Watchdog");
            Watchdog.getInstance().init(context, battery, power, alarm,
                    ActivityManagerService.self());

            Slog.i(TAG, "Window Manager");
            wm = WindowManagerService.main(context, power,
                    factoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL);
            ServiceManager.addService(Context.WINDOW_SERVICE, wm);

            ((ActivityManagerService)ServiceManager.getService("activity"))
                    .setWindowManager(wm);

            // 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 (SystemProperties.get("ro.kernel.qemu").equals("1")) {
                Slog.i(TAG, "Registering null Bluetooth Service (emulator)");
                ServiceManager.addService(BluetoothAdapter.BLUETOOTH_SERVICE, null);
            } else if (factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL) {
                Slog.i(TAG, "Registering null Bluetooth Service (factory test)");
                ServiceManager.addService(BluetoothAdapter.BLUETOOTH_SERVICE, null);
            } else {
                Slog.i(TAG, "Bluetooth Service");
                bluetooth = new BluetoothService(context);
                ServiceManager.addService(BluetoothAdapter.BLUETOOTH_SERVICE, bluetooth);
                bluetooth.initAfterRegistration();
                bluetoothA2dp = new BluetoothA2dpService(context, bluetooth);
                ServiceManager.addService(BluetoothA2dpService.BLUETOOTH_A2DP_SERVICE,
                                          bluetoothA2dp);

                int bluetoothOn = Settings.Secure.getInt(mContentResolver,
                    Settings.Secure.BLUETOOTH_ON, 0);
                if (bluetoothOn > 0) {
                    bluetooth.enable();
                }
            }

        } catch (RuntimeException e) {
            Slog.e("System", "Failure starting core service", e);
        }