Date: Fri, 01 Dec 2000 09:44:25 +0200
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
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To: pjfarley AT banet DOT net
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In-reply-to: <5.0.1.4.0.20001130210206.0259eb60@pop5.banet.net>
	(pjfarley AT banet DOT net)
Subject: Re: Locking fcntl() and flock() patches
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> Date: Thu, 30 Nov 2000 21:33:32 -0500
> From: "Peter J. Farley III" <pjfarley AT banet DOT net>
> 
> If there are no read locks, and we simulate them with write locks... 
> well, maybe not, after all.  If the locks are regional, then another 
> process won't be able to change that region, after all.  I see your 
> point.  Maybe we can just translate the read locks to write locks and 
> be done with it.

That's what I thought we should do.

>  >The detection part is easy: Int 2Fh with AX=1000h will tell you if
>  >SHARE is installed (and DTRT on Windows as well, AFAIK).
> 
> Well, that's interesting.  Do we then *want* to act as a no-op when 
> SHARE is not installed, and always return success?

I think so.  The only case where this loses is on Windows 3.X where
someone uninstalled SHARE.EXE.  We can document this special case and
be done with it.

> That still has the 
> disadvantage for new coding with erroneous locking logic that it won't 
> catch the error(s) until the program is run in a locking environment.

We can document this as well.  Anyway, whoever writes code that needs
locking should test it in the environment where locking works, right?