From:	leva AT hotmail DOT com
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: interprocess synchronization and "Sharing violation"
Date:	Wed, 27 Jan 1999 17:19:57 GMT
Organization:	Deja News - The Leader in Internet Discussion
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References:	<Pine DOT SUN DOT 3 DOT 91 DOT 990124105832 DOT 4501P-100000 AT is>
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Dear Eli!

In article <Pine DOT SUN DOT 3 DOT 91 DOT 990124105832 DOT 4501P-100000 AT is>,
  djgpp AT delorie DOT com wrote:

> > under Windows 95. Unfortunately this approach fails on Windows 3.11. Windows
> > complain about Sharing Violation :-(. Perhaps somebody can suggest something
> > here?
> You could try calling DOS function 6Ch directly (rather than `open' or
> `_open') and use the different sharing bits defined for that
> function.  Since it is easy to find out what version of Windows you
> are running on, there should be no problem to have your program behave
> differently on each version of Windows, should that be necessary.
Well, I'm currently trying to do it. No success so far, though. Unfortunately
I have no Win3.1 installation at home so development/target environments are
spatially distant :-(. BTW, it seems (what I found while reading library
sources) that there's no need in direct int21 calls - one can specify share
flags in the static variable (something like __SHARE... - I don't remember
exactly).

> > 1. Is there any way to make windows 3.11 return with error rather than pop a
> >      messagebox to user?
> Keep dreaming...
I do.

> > 2. Is there any way to synchronize processes without relying on the file
> >      system?
> I cannot think of anything else, as far as DJGPP programs are concerned.
The idea was to create a free program that anyone can modify. That's why DJGPP
was used. I'm not aware of other free C-compilers whose output can be executed
under Win3.1. To say truth, I even don't know if Win3.1 supplies its own (not
DOS) applications some synchronization primitives.

Well, anyway, thank you for your reply.

-Leva.

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