Android系统启动流程（三）解析SystemServer进程启动过程

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1.Zygote启动SystemServer进程

在上一篇文章中我们讲到在ZygoteInit.java的startSystemServer函数中启动了SyetemServer进程，如下所示。

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

private static boolean startSystemServer(String abiList, String socketName)

            throws MethodAndArgsCaller, RuntimeException {

     ...

        if (pid == ) {

            if (hasSecondZygote(abiList)) {

                waitForSecondaryZygote(socketName);

            }

            handleSystemServerProcess(parsedArgs);

        }

        return true;

}

2.SystemServer进程启动过程

启动Binder线程池

3.解析SyetemServer进程

我们先来查看SystemServer的main函数：
frameworks/base/services/java/com/android/server/SystemServer.java

public static void main(String[] args) {

        new SystemServer().run();

}

main函数中只调用了SystemServer的run函数，如下所示。

private void run() {

        ...

            System.loadLibrary("android_servers");//

        ...

            mSystemServiceManager = new SystemServiceManager(mSystemContext);//

            LocalServices.addService(SystemServiceManager.class, mSystemServiceManager);

        ...

         try {

            Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "StartServices");

            startBootstrapServices();//

            startCoreServices();//

            startOtherServices();//

        } catch (Throwable ex) {

            Slog.e("System", "******************************************");

            Slog.e("System", "************ Failure starting system services", ex);

            throw ex;

        } finally {

            Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);

        }

        ...

    }