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GET_LUN running out of LUNs? [message #31121]

Wed, 12 June 2002 16:40

MKatz843
Messages: 98
Registered: March 2002

Member

I'm having trouble with GET_LUN and OPENW,
running out of free units, even though I'm very careful
to close every unit I open. These are units numbered
from 100 to 128. I don't remember reading that
IDL treats them differently than numbers below 100.

Here's are three examples.

FOR i=0,30 do BEGIN
GET_LUN, unit
print, i, unit
close, unit
ENDFOR
END

Output:
0 100
1 101
2 102
. . .
27 127
28 128
% GET_LUN: All available logical units are currently in use.
% Execution halted at: $MAIN$ 2

However, if I do this

FOR i=0,30 do BEGIN
GET_LUN, unit
print, i, unit
close, unit, /ALL ;--- Note the /ALL here.
ENDFOR
END

Then the output is

0 100
1 100
2 100
. . . and so forth. Perfect.

I get the same behavior when OPENW replaces GET_LUN
as follows

OPENW, unit, filename, /GET_LUN

So it would appear that IDL is ignoring my request to CLOSE
the file unit, unless I specify /ALL.

Am I missing a trick here. Do I need to use

CLOSE, unit, /PLEASE ?

Thanks,

M. Katz

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GET_LUN running out of LUNs?

By: MKatz843 on Wed, 12 June 2002 16:40

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