SCOUG-Programming Mailing List Archives

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Date:	Tue, 26 Oct 1999 15:47:49 PDT
From:	"Aaron Lawrence" <aaronl@pec.co.nz >
Reply-To:	scoug-programming@scoug.com
To:	scoug-programming@scoug.com
Subject:	SCOUG-Programming: REXX file lock/unlock, program instances

Content Type: text/plain

Peter Skye wrote:
> I wrote some test programs just now (Warp 4 FixPak 10), and they allow
> me to open a file in one program and, while the file remains open, open
> and read the file in another program. Thus, the files aren't locked
Ah, well I learnt something then! :-)
That's inconvenient for you though isn't it!

> while open. This may be specific to OS/2 and other platforms may lock
> the files while open.
Well, in a real language you can specify shared or not, and usually it is not by
default. Rexx must have decided to implement read-sharing as a default and only
behaviour.

> Mutexes were added in one of the FixPaks (I have them in FixPak 10 and
> they seem to work fine).
Well, yes they would work, but I don't think they will be automatically
destroyed if your program crashes (since there is no 'program' running, except
cmd.exe) unless you ran the Rexx script with a separate cmd.exe. AFAIK.

> I was hoping there would be some one-line solution. (
Don't we all!

Cheers

Aaron

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