Kent Larsson wrote:

> In absence of shared memory and threads. What I really must have is
> some kind of mutex functionality. I will be manipulating files on disk
> and I don't want two instances to be able to touch the disk at the
> same time. 

Touch the disk or touch the file?  I assume you meant the latter, i.e.
you don't want two instances to operate on the same file concurrently. 

> Is there something I could use for mutual exclusion? If 
> there aren't any dedicated methods, are there 100% reliable
> workarounds?

Look up file locking.  In fact, this was the topic of a very recent
thread.


/Per Jessen, Zürich


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