Greg --
That is indeed how GT.M works. There is an environment variable
$ZROutines (which is initialized at process startup from the environment
variable $gtmroutines), which defines a search path when a routine ^XYZ
needs to be linked.
Consider a search path such as: "/home/bhaskar/myVistA
/usr/local/FOIAVistA20060615/o(/usr/local/FOIAVistA20060615/r)
/usr/local/gtm_V5.1-000". When attempting to link ^XYZ, GT.M does the
following:
1. Look for a file /home/bbhaskar/myVistA/XYZ.o.
1a. If /home/bbhaskar/myVistA/XYZ.o exists, look for a file
/home/bhaskar/myVistA/XYZ.m.
1a(i) If /home/bhaskar/myVistA/XYZ.m exists and it is newer than
/home/bhaskar/myVistA/XYZ.o, compile /home/bhaskar/myVistA/XYZ.m to
generate a new /home/bhaskar/myVistA/XYZ.o and link the (new or old)
file /home/bhaskar/myVistA/XYZ.o. An error is generated if
recompilation is necessary, and GT.M does not have appropriate
permissions to create a new /home/bhaskar/myVistA/XYZ.o.
1a(ii) If /home/bhaskar/myVistA/XYZ.m does not exist
/home/bhaskar/myVistA/XYZ.o is linked.
1b If /home/bbhaskar/myVistA/XYZ.o does not exist, look for a file
/home/bhaskar/myVistA/XYZ.m.
1b(i) If /home/bhaskar/myVistA/XYZ.m exists, compile
/home/bhaskar/myVistA/XYZ.m to generate /home/bhaskar/myVistA/XYZ.o and
link the new file /home/bhaskar/myVistA/XYZ.o. An error is generated if
GT.M does not have appropriate permissions to create
/home/bhaskar/myVistA/XYZ.o.
1b(ii) If /home/bhaskar/myVistA/XYZ.m does not exist, go to Step 2
and seek XYZ.o in the next "chunk" of $ZROutines -
"/usr/local/FOIAVistA20060615/o(/usr/local/FOIAVistA20060615/r)".
2. The logic here is the same as for Step 1, except that the object file
sought is /usr/local/FOIAVistA20060615/o/XYZ.o and the source file
sought is /usr/local/FOIAVistA20060615/r/XYZ.m. If it is not found
here, it is sought in the next chunk, /usr/local/gtm_V5.1-000.
3. The logic here is the same as for Step 1. If it is not found in the
last chunk of $ZROutines, an error is generated.
Note that $ZROutines can be set within the mumps process. So, a complex
name space scheme could treat each name space as a search path rather
than just a directory in the current search path, trapping the error if
there is a link failure to change search paths for a new name space.
A slightly more complex chunk than
"/usr/local/FOIAVistA20060615/o(/usr/local/FOIAVistA20060615/r)" might
be a chunk such as
"/usr/local/FOIAVistA20060615/o(/usr/local/FOIAVistA20060615/p
/usr/local/FOIAVistA20060615/r)" which means to match a file
/usr/local/FOIAVistA20060615/o/XYZ.o by seeking for XYZ.m first in
/usr/local/FOIAVistA20060615/p and then in /usr/local/FOIAVistA20060615/r.
Hope this helps to explain things.
Regards
-- Bhaskar
Greg Woodhouse wrote, on 08/29/2006 12:02 PM:
> Caché, of course, has namespaces, but GT.M seems to provide analogous
> functionality though the use of "private" global and routine
> directories. Not being a GT.M expert by any stretch, I wonder if it is
> feasible to treat a routien directory as a namespace that can be
> imported or used dynamically (i.e., code could be written so that if
> you zlink "XYZ" it will first look in directory abc then, say, the
> system directory and finally the user's home directory).
>
> I ask because the mehtod of assigning namespaces that are implemented
> as the first 2-4 charachters as routine and variable names is, well,
> archaic. If better namespaces were available in both Caché and GT.M it
> might be reasonable to consider implementing them -- at least for
> future work.
>
> ===
> Gregory Woodhouse <[EMAIL PROTECTED]>
>
> "Judge a man by his questions not his answers."
> --Voltaire
>
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