Re: Exclusive File Access
Re: Exclusive File Access
- Subject: Re: Exclusive File Access
- From: Ondra Cada <email@hidden>
- Date: Thu, 21 Nov 2002 14:54:57 +0100
On Thursday, Nov 21, 2002, at 00:31 Europe/Prague, Rosyna wrote:
I'm talking about exclusive write access only.
With general document-editing applications, we are lucky there is
nothing as that: again, it would be *QUITE* crippling.
I don't say there are no special apps which need it, but plain things
like TextEdit definitely do not.
If another user opens a file already opened for write access, open it
read-only.
Luckily, with standard document-based applications files are *NEVER*
opened read-write.
(i) when *document* is opened, *file* is opened read-only, read into
memory, and closed;
(ii) when document is saved,
(a) another file is *created* beside the original one, with the new
contents;
(b) the original file is removed (or renamed to *~.*)
(c) the new file is renamed to the original name.
This is the *one* right way to do things for general document-based
applications. Again, if you have special needs, you have a number of
ways to fill them, but DON'T mess things up just for kicks.
---
Ondra Cada
OCSoftware: email@hidden
http://www.ocs.cz
private email@hidden
http://www.ocs.cz/oc
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