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Date:	Tue, 26 Oct 1999 11:12:01 PDT
From:	Steven Levine <steve53@earthlink.net >
Reply-To:	scoug-programming@scoug.com
To:	scoug-programming@scoug.com
Subject:	SCOUG-Programming: REXX file lock/unlock, program instances

In <3814FE25.57DB@peterskye.com>, on 10/25/99
at 06:50 PM, Peter Skye said:

>-- How do I lock a file, unlock it after using it, and what error code
>does another program receive if it attempts to open/lock an
>already-locked file?

There's are addin REXX libraries to support all of this if you need fancy.

For simple use, open the file for write and others will not be allowed to
write it. I'd have to look up the exact error. Other REXX scripts will
probably see "NOT READY". Real programs (
) will probably see Access
Denied.

>-- How can an executing REXX .cmd file find out if it is already
>running?

Again, addin libraries. Simple cases can be handled with lock files.

HTH,

Steven

--
-----------------------------------------------------------
Steven Levine MR2/ICE #10183 Warp4/FP11
-----------------------------------------------------------

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