Re: [uml-devel] Making UML Single Threader

[Rob Landley <rob@landley.net>]

On Monday 07 November 2005 23:13, Can Sar wrote:
> Hi,
>
> I am trying to make a 1 thread version of UML that does not need to
> be able to support user level programs.

Why?

Did you ever read Rik van Reil's list of the dumbest patches he's ever seen?  
This is the first entry in the list:

http://www.surriel.com/potm/apr2001.shtml

> So I don't care about systemcall interception or anything like that,

*blink*  *blink*

Ok, you want user mode linux, but you don't want it to actually run user 
processes, nor do want it to be able to intercept system calls.

Um...  What's left?

> I just want a copy of 
> UML that gets a basic kernel environment running (where I could call
> some kernel functions like sys_read or sys_open and then exit) that
> never calls fork on the host.

vfork, maybe?

Have you tried just loading a module into the existing User Mode Linux?

> Sorry if this all sounds a bit weird, it's for a research project and
> we are trying to port UML to an environment that only supports single
> threaded operation.

Define "port".  (Have you looked at mmu-less linux?  Are you saying you 
haven't got a timer interrupt and can't fake up some kind of green-threads 
approach like people managed to do under _DOS_?)

Rob


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