[Tcl-bugs] [ tcl-Bugs-1176470 ] Registration of [loaded] packages

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Bugs item #1176470, was opened at 2005-04-04 09:31
Message generated for change (Comment added) made by hobbs
You can respond by visiting: 
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Category: 39. Dynamic Loading
Group: development: 8.5a3
>Status: Closed
>Resolution: Invalid
Priority: 5
Submitted By: Erik Leunissen (eriklns)
Assigned to: Kevin B KENNY (kennykb)
Summary: Registration of [loaded] packages

Initial Comment:
L.S.

Two unexpected results occur when importing packages
which load compiled code:

1. When doing [package forget], the entry of the
corresponding shared library is not removed from what's
returned by [info loaded].

2. After having done [package forget], and issuing
again [package require], an error message is returned:
"can't find package ..."

An example session that exercises the above sequence
for Tkhtml and Tktable is appended to this message. 

A discussion in c.l.t. (started at 4-Apr-2005,
featuring Michael Schlenker, Don Porter and yours
truly) arrived at the point where dgp judges there is
either a bug here or a misfeature.

Erik Leunissen
==============

Example Tcl session:
---------------

% info loaded
{{} Tk}
% package require Tkhtml
2.0
% info loaded
{/usr/lib/tk8.4/../libtk8.4.so Tk}
{/usr/local/lib/Tkhtml2.0/libTkhtml2.0.so Tkhtml} {{} Tk}
% package forget Tkhtml
% info loaded
{/usr/lib/tk8.4/../libtk8.4.so Tk}
{/usr/local/lib/Tkhtml2.0/libTkhtml2.0.so Tkhtml} {{} Tk}
% package require Tkhtml
can't find package Tkhtml
% package require Tktable
2.8
% info loaded
{/usr/local/lib/Tktable2.8/libTktable2.8.so Tktable}
{/usr/lib/tk8.4/../libtk8.4.so Tk}
{/usr/local/lib/Tkhtml2.0/libTkhtml2.0.so Tkhtml} {{} Tk}
% info loaded
{/usr/local/lib/Tktable2.8/libTktable2.8.so Tktable}
{/usr/lib/tk8.4/../libtk8.4.so Tk}
{/usr/local/lib/Tkhtml2.0/libTkhtml2.0.so Tkhtml} {{} Tk}
% package forget Tktable
% info loaded
{/usr/local/lib/Tktable2.8/libTktable2.8.so Tktable}
{/usr/lib/tk8.4/../libtk8.4.so Tk}
{/usr/local/lib/Tkhtml2.0/libTkhtml2.0.so Tkhtml} {{} Tk}
% package require Tktable
can't find package Tktable

-- end of message --


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>Comment By: Jeffrey Hobbs (hobbs)
Date: 2005-04-04 10:30

Message:
Logged In: YES 
user_id=72656

This is clearly a misunderstanding on the part of the user.
 Maybe the docs need clarification, but it's not a bug. 
package forget forgets the 'ifneeded' part, which is of
course why the next package require will fail.  It does
nothing else - it does not unload any packages.  The 'info
loaded' is still 100% correct, as those dlls are still
loaded.  You could still say 'load {} Tkhtml|Tktable' and
they will load.

----------------------------------------------------------------------

Comment By: Don Porter (dgp)
Date: 2005-04-04 09:48

Message:
Logged In: YES 
user_id=80530


I'd have expected each [load]
command to call the *_Init()
routine again.

That said, [package forget]
is a rather specialized operation;
not really meant for much use
in programs.  Avoid if possible.

----------------------------------------------------------------------

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