Android系统启动流程（三）解析SystemServer进程启动过程

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 == 0) {
            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");//1
        ...
            mSystemServiceManager = new SystemServiceManager(mSystemContext);//2
            LocalServices.addService(SystemServiceManager.class, mSystemServiceManager);
        ...    
         try {
            Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "StartServices");
            startBootstrapServices();//3
            startCoreServices();//4
            startOtherServices();//5
        } catch (Throwable ex) {
            Slog.e("System", "******************************************");
            Slog.e("System", "************ Failure starting system services", ex);
            throw ex;
        } finally {
            Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
        }
        ...
    }

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