| Re: logical units unavailable [message #9015 is a reply to message #9014] |
Fri, 23 May 1997 00:00  |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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[This followup was posted to comp.lang.idl-pvwave and a copy was sent to
the cited author.]
Danial Williams writes:
> I have a program which spawns some c-code, then reads its output. I
> use the "spawn" command with /get_lun, as in:
> IDL> spawn,cmd,unit=lun,/get_lun
>
> After I've read the results, I use "free_lun" to free the logical
> unit:
>
> IDL> free_lun,lun
>
> I find that when I've run this spawn that I get the error:
>
> % SPAWN: All available logical units are currently in use.
>
> Which is crazy, since every use of a lun frees it also. What is up
> with this? Is there any way to release all logical units without
> exiting IDL and loosing all the work I've done?
I don't know exactly what is going on here, but the use of
the Get_Lun keyword on a Spawn command is highly irregular.
I know the Spawn command uses the procedure Get_Lun to get
a unit (which is why you use Free_Lun to free it), but I've
never seen it called this way. (I don't have a UNIX machine
to see if it even works.)
In any case, CLOSE, /ALL will close and free any logical
units that are still open.
Cheers,
David
----------------------------------------------------------
David Fanning, Ph.D.
Fanning Software Consulting
Customizable IDL Programming Courses
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com
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