Re: Exclusive File Access

FROM : Cameron Hayne
DATE : Wed Nov 20 17:08:30 2002

On 19/11/02 2:38 pm, "Donald Brown" <<email_removed>> wrote:
> Here's the problem with my app, that my customers can run into.  Person A
> opens file (which reads it all into RAM), Person B opens file (ditto),
> Person A makes changes and saves it, Person B makes changes and saves it.
> Person A's changes are thrown away, there is no warning that anything is
> wrong.  This is bad.

There are lots of ways you can deal with this. One would be to create a
"semaphore" file indicating that the document file is being edited. When
person B opens the file, he/she is told that someone else is editing it and
given the option to open a read-only version or to edit a (renamed) copy of
the file. I believe this is what MS Word does.

--
Cameron Hayne (<email_removed>)
Hayne of Tintagel
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