[Vm-dev] help on creating plugin

[Esteban Lorenzano]

Hi,
I need some help/advice for a plugin I'm writing.
I'm already downloaded VMMaker and managed to compile a new VM in OS/X, 
and I already write and compile and test a simple plugin (and I have to 
say the process is very simple, and all my problems were because I 
never used Xcode before), but now, with the plugin running, comes the 
"optimization" phase, and there I have many doubts:

1) An external plugin blocks the VM when primitive is called? if so, 
how do I manage to avoid this?
2) what is the right way to use strings? now, I'm obtaining them as 
parameters, but the string comes without final zero, so C does not 
works fine... because of that, I'm copying them into a new variable 
(memory allocated with malloc and freed after use), but it does not 
seems to be very performant... is there a better way?
3) in general, what is the best way to return Strings into Squeak? I 
have to create an instance with interpreterProxy>>instantiateClass: 
each time?

Well, I have many doubts about how to optimize my code... where can I 
look to see some example code?

Thanks,
Esteban