Re: how to make a string outlive the invocation of a C function?

[Asko Kauppi <askok@...>]

Jesús Ruiz de Infante kirjoitti 17.4.2007 kello 12:04:

> Gé Weijers wrote:
> > Every process should get a copy of your global variables, not  
> > share them with other processes. Global variables are shared  
> > between (Posix) threads that are part of the same process, not  
> > between processes (the library loader usually uses copy-on-write  
> > pages to implement this). I would still prefer a reentrant  
> > solution though, so storing it in the module environment is the  
> > right thing to do.
> You are right. Static variables contained in DLLs are not shared by  
> the processes linked against them. At least not on Linux. Is this  
> point standarized?

This is standardized. Processes are certainly different, but use of  
your module in multithreading scenarios s.a. Lanes would be affected  
- there each separate Lua state is run as an OS thread, and modules  
may be initialized multiple times.

You can at least detect multiple initialization by checking, if a  
global already has a value. That would give an error instead of just  
weird behaviour later at runtime.