当前位置: 首页 > news >正文

wps演示做的和网站导航网站seo应用

wps演示做的和网站导航,网站seo应用,番禺做网站平台,上海有哪些公司名字叫什么SystemServer进程在android系统中占了举足轻重的地位,系统的所有服务和SystemUI都是由它启动。 一、SystemServer进程主函数流程 1、主函数三部曲 //frameworks/base/services/java/com/android/server/SystemServer.java /** * The main entry point from zy…

SystemServer进程在android系统中占了举足轻重的地位,系统的所有服务和SystemUI都是由它启动。

一、SystemServer进程主函数流程

1、主函数三部曲

//frameworks/base/services/java/com/android/server/SystemServer.java    /** * The main entry point from zygote. */public static void main(String[] args) {new SystemServer().run();}

SystemServer的入口函数同样是main,调用顺序先是构造函数,再是run,构造函数没有什么重点地方后文dump详细介绍,主要流程主要还是run方法。run里面哦流程其实还是遵循普遍的三部曲:初始化上下文->启动服务->进入loop循环

1)初始化上下文
//frameworks/base/services/java/com/android/server/SystemServer.java    private void run() {TimingsTraceAndSlog t = new TimingsTraceAndSlog();try {t.traceBegin("InitBeforeStartServices");//.....一些属性的初始化....// The system server should never make non-oneway callsBinder.setWarnOnBlocking(true);// The system server should always load safe labelsPackageItemInfo.forceSafeLabels();// Default to FULL within the system server.SQLiteGlobal.sDefaultSyncMode = SQLiteGlobal.SYNC_MODE_FULL;// Deactivate SQLiteCompatibilityWalFlags until settings provider is initializedSQLiteCompatibilityWalFlags.init(null);// Here we go! Slog.i(TAG, "Entered the Android system server!");final long uptimeMillis = SystemClock.elapsedRealtime(); //记录开始启动的时间错,调试系统启动时间的时候需要关注// Mmmmmm... more memory!VMRuntime.getRuntime().clearGrowthLimit();// Some devices rely on runtime fingerprint generation, so make sure we've defined it before booting further.Build.ensureFingerprintProperty();// Within the system server, it is an error to access Environment paths without explicitly specifying a user.Environment.setUserRequired(true);// Within the system server, any incoming Bundles should be defused to avoid throwing BadParcelableException.BaseBundle.setShouldDefuse(true);// Within the system server, when parceling exceptions, include the stack traceParcel.setStackTraceParceling(true);// Ensure binder calls into the system always run at foreground priority.BinderInternal.disableBackgroundScheduling(true);// Increase the number of binder threads in system_serverBinderInternal.setMaxThreads(sMaxBinderThreads);// Prepare the main looper thread (this thread).              android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_FOREGROUND);android.os.Process.setCanSelfBackground(false);Looper.prepareMainLooper();Looper.getMainLooper().setSlowLogThresholdMs(SLOW_DISPATCH_THRESHOLD_MS, SLOW_DELIVERY_THRESHOLD_MS);SystemServiceRegistry.sEnableServiceNotFoundWtf = true;// Initialize native services.System.loadLibrary("android_servers");// Allow heap / perf profiling.initZygoteChildHeapProfiling();// Check whether we failed to shut down last time we tried. This call may not return.performPendingShutdown();// Initialize the system context.createSystemContext();// Call per-process mainline module initialization.ActivityThread.initializeMainlineModules();} finally {t.traceEnd();  // InitBeforeStartServices}
2)启动系统所有服务
//frameworks/base/services/java/com/android/server/SystemServer.java    // Start services.try {t.traceBegin("StartServices");startBootstrapServices(t);   //启动BOOT服务(即没有这些服务系统无法运行)startCoreServices(t);        //启动核心服务startOtherServices(t);       //启动其他服务startApexServices(t);        //启动APEX服务,此服务必现要在前面的所有服务启动之后才能启动,为了防止OTA相关问题// Only update the timeout after starting all the services so that we use// the default timeout to start system server.updateWatchdogTimeout(t);} catch (Throwable ex) {Slog.e("System", "******************************************");Slog.e("System", "************ Failure starting system services", ex);throw ex;} finally {t.traceEnd(); // StartServices}/*** Starts system services defined in apexes.* <p>Apex services must be the last category of services to start. No other service must be* starting after this point. This is to prevent unnecessary stability issues when these apexes* are updated outside of OTA; and to avoid breaking dependencies from system into apexes.*/private void startApexServices(@NonNull TimingsTraceAndSlog t) {t.traceBegin("startApexServices");// TODO(b/192880996): get the list from "android" package, once the manifest entries are migrated to system manifest.List<ApexSystemServiceInfo> services = ApexManager.getInstance().getApexSystemServices();for (ApexSystemServiceInfo info : services) {String name = info.getName();String jarPath = info.getJarPath();t.traceBegin("starting " + name);if (TextUtils.isEmpty(jarPath)) {mSystemServiceManager.startService(name);} else {mSystemServiceManager.startServiceFromJar(name, jarPath);}t.traceEnd();}// make sure no other services are started after this pointmSystemServiceManager.sealStartedServices();t.traceEnd(); // startApexServices}

如上代码大体启动了四类服务:

  • startBootstrapServices:启动一些关键引导服务,这些服务耦合到一起
  • startCoreServices:启动一些关键引导服务,这些服务没有耦合到一起
  • startOtherServices:启动其他一些杂七杂八的服务
  • startApexServices:启动apex类的服务,其实就是mainline那些东西,详情参考请点击我
3)进入loop循环
//frameworks/base/services/java/com/android/server/SystemServer.javaStrictMode.initVmDefaults(null);if (!mRuntimeRestart && !isFirstBootOrUpgrade()) {final long uptimeMillis = SystemClock.elapsedRealtime();final long maxUptimeMillis = 60 * 1000;if (uptimeMillis > maxUptimeMillis) {Slog.wtf(SYSTEM_SERVER_TIMING_TAG, "SystemServer init took too long. uptimeMillis=" + uptimeMillis);}}// Loop forever.Looper.loop();throw new RuntimeException("Main thread loop unexpectedly exited");

和之前讲的binder一样,基本上所有的进程最后都会进入loop进行循环,轮询主线程相关的handle消息和binder消息,如下日志堆栈,表示handle消息处理过程中发生异常:

2、顺序启动服务

二、SystemServer正常启动日志

1、SystemServerTiming日志封装

2、SystemServer启动阶段OnBootPhase

3、SystemServer无法找到服务

4、Slow operation

三、SystemServer dumpsys解读

1、SystemServer的dump

2、其他服务的dump

SystemServer:Runtime restart: falseStart count: 1Runtime start-up time: +8s0msRuntime start-elapsed time: +8s0msSystemServiceManager:Current phase: 1000Current user not set!1 target users: 0(full)172 started services:com.transsion.hubcore.server.TranBootstrapServiceManagerServicecom.android.server.security.FileIntegrityServicecom.android.server.pm.Installercom.android.server.os.DeviceIdentifiersPolicyServicecom.android.server.uri.UriGrantsManagerService.Lifecyclecom.android.server.powerstats.PowerStatsServicecom.android.server.permission.access.AccessCheckingServicecom.android.server.wm.ActivityTaskManagerService.Lifecyclecom.android.server.am.ActivityManagerService.Lifecycle......com.android.server.Watchdog:WatchdogTimeoutMillis=60000SystemServerInitThreadPool:has instance: falsenumber of threads: 8service: java.util.concurrent.ThreadPoolExecutor@7bf04fb[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 351]is shutdown: trueno pending tasksAdServices:mAdServicesModuleName: com.google.android.adservicesmAdServicesModuleVersion: 341131050mHandlerThread: Thread[AdServicesManagerServiceHandler,5,main]mAdServicesPackagesRolledBackFrom: {}mAdServicesPackagesRolledBackTo: {}ShellCmd enabled: falseUserInstanceManagermAdServicesBaseDir: /data/system/adservicesmConsentManagerMapLocked: {}mAppConsentManagerMapLocked: {}mRollbackHandlingManagerMapLocked: {}mBlockedTopicsManagerMapLocked={}TopicsDbHelperCURRENT_DATABASE_VERSION: 1mDbFile: /data/system/adservices_topics.dbmDbVersion: 1

http://www.ritt.cn/news/20688.html

相关文章:

  • 网络销售是做网站推广谷歌搜索引擎大全
  • 上海建站提供商网络营销推广的方法有哪些
  • 在哪个网站做流动补胎的广告好新手销售怎么和客户交流
  • 自己的网站怎么做关键词优化seo咨询解决方案
  • 公司网站建设大概多少钱软文写作
  • 网站模板自建站买转发链接
  • 商务网站系统中支付功能怎么做免费做网站网站
  • 天津网站优化哪家最专业优化师
  • 做教育网站宣传策略百度账号人工客服电话
  • 游戏设计培训机构有哪些整站优化
  • 网站cms相关知识优化方案官网
  • 做渠道该从哪些网站入手天津网络推广公司
  • 网站设计大概价格seo诊断工具有哪些
  • 装修平台网络推广公司百度seo免费推广教程
  • 农民工找活平台seo引擎搜索网站关键词
  • 邵阳市建设投资经营集团网站西安网站seo外包
  • wordpress导入b站视频专业做app软件开发公司
  • 网站推广软文几个绝招产品宣传方案
  • 上线了网站seo内容优化是什么意思
  • asp做的静态网站卡不卡电商卖货平台有哪些
  • 银川做网站最好的公司有哪些seo用什么工具
  • 莱芜网站开发代理如何让百度收录网站
  • 深圳福田网站建设公司公司推广
  • 中国十大网站建设论坛推广工具
  • 河南郑州做网站汉狮杭州谷歌seo公司
  • 湘潭响应式网站建设 速来磐石网络图片外链生成
  • 陕西网站建设方案优化友情链接
  • 建站系统下载宣传方式有哪些
  • 建设的网站都是怎么赚钱网络营销渠道有哪三类
  • 网站点内页还是首页百度招聘网最新招聘信息