System server query

[Nitin Mahajan]

Hi!

I was just going through the code to understand how the system server
is started.

I have some query here. Why there is a LOGI saying LOGI("System
server: starting Android runtime.\n"); in file System_init.cpp?
We aren't actually starting the Android runtime here. We are just
starting the native services and the Android java services.

1. Is this understanding of mine correct?

As per my understanding the AndroidRuntime has been already started in
Zygote and
when we did a fork to start system server, the AndroidRuntime object
which was created on stack, is available to the child process from
Zygote's address space itself.

2. Is this understanding of mine correct?

Thanks in advance

regards
-Nitin

[Nigel Sheridan-Smith]

Hi Nitin,

System server is started by init, the first system process.

It starts the Dalvik VM (see /frameworks/base/cmds/system_server/library) and Zygote in two phases - it calls init1() and init2() in android/os/Zygote.java (from my memory). Zygote then uses JNI to fork itself by calling back into the Android C++ libraries.

Cheers,

Nigel

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[freakingtux]

Hi

On Tuesday, August 23, 2011 5:10:48 PM UTC+2, Nitin wrote:

Hi!

I was just going through the code to understand how the system server
is started.

Have a look at http://elinux.org/Android_Booting

and http://elinux.org/Android_Zygote_Startup

Greetings