SYSMGR%UK.AC.KCL.PH.IPG@AC.UK (03/17/87)
From: info-vax-request@uk.ac.ucl.cs 16-MAR-1987 20:50
To: SYSMGR
Subj: SYS$SETIMR
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Date: 16 MAR 87 15:54-N
From: U00159 <U00159%bitnet.hasara5@edu.wisc.wiscvm>
To: INFO-VAX@arpa.sri-kl
Subject: SYS$SETIMR
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> I want to execute a routine every 3 seconds. I thought to
> do that with SYS$SETIMR. However I have problems with it. (...)
> The program here does not compile.
..
> subroutine astproc
..
..
> status = SYS$SETIMR(,bindelay,astproc,)
> if (.not. status) call lib$stop(%VAL(status))
..
> The compiler gives the following messages
> FORT-F-INVLEXEME, Variable name, constant or expression invalid in
> this context.
> [lay,astproc, )] in module astproc
It's a feature of the compiler (or a bug). You cannot refer to a subroutine or
function's name from within itself, presumably because FORTRAN does not allow
recursion and DEC have not realised that the above example does not actually
involve recursion.
If you put EXTERNAL ASTPROC and the SYS$SETIMR call into another subroutine,
and call that from ASTPROC itself, you will successfully fool the compiler
and everything will work perfectly.
My memory may be at fault, but I think it used to work on the old compiler...
Nigel Arnot (Dept. Physics, Kings college, Univ. of London; U.K)
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