Hi fadden, Thank you very much for your answer. It cleared my thoughts on this subject.
P.S. Sorry for the late reply but it took me some time to analyze your answer. Cheers, On Dec 2, 9:47 pm, fadden <[email protected]> wrote: > On Dec 2, 4:06 am, bacchus <[email protected]> wrote: > > > By startup, I mean to understand how the Android Runtime is setup and > > Dalvik is started. > > > Throughout the code reading process I've found VMRuntime. > > VMRuntime doesn't have a whole lot to do with that. It just has some > utility functions. The class is defined here: > > dalvik/libcore/dalvik/src/main/java/dalvik/system/VMRuntime.java > > The native methods it refers to are defined here: > > dalvik/vm/native/dalvik_system_VMRuntime.c > > The VM is created by frameworks/base/core/jni/AndroidRuntime.cpp: > > if (JNI_CreateJavaVM(pJavaVM, pEnv, &initArgs) < 0) { > > The runtime initialization does a bunch of jumping around, some of > which is cruft from the days before the "zygote" stuff existed. > Here's a part of an explanation I wrote about a week ago when > discussing something related: > > ----- > AndroidRuntime.cpp starts the VM, calls into RuntimeInit.main(). > Crazy things happen. We end up in ZygoteInit.main(), which has been > requested to call Zygote.forkSystemServer() to create system_server. > The zygote goes to sleep on a socket. > > (All of the magic forking and such happens in dalvik/vm/native/ > dalvik_system_Zygote.c .) > > At this point we have two processes: zygote (a VM with a single thread > that is listening on a socket) and system_server (which was forked > from zygote and is now busily doing stuff). When system_server > decides it wants to create a new app process, it sends an IPC to the > zygote process, which calls Zygote.forkAndSpecialize(). > > The forkAndSpecialize call takes a bunch of arguments, mostly having > to do with what uid and capabilities the new process should have. > (zygote runs as root.) When the child process returns to Java-land, > it reads some more stuff from the command socket, then closes it. > ----- -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
