RE: Procedure types

From: Fyodor Tkachov <"Fyodor>
Date: Fri, 19 Nov 2004 16:10:48 +0300

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We should perhaps distinguish the language Component Pascal and a specific implementation of its run-time in BlackBox.

> Is there a (unnecessary) safety problem with objects
> and unloading that could have been avoided if the
> compiler has been written differently?

And the loader. Actually, only small additions seem to be necessary.

The mechanism I tried to describe is not implemented in BlackBox 1.4.
But it could be if I am not mistaken.
The problems of this kind should, I think, occur with any system that receives and executes requests from the outside world (embedded [recall Denia]; a computational cluster node [my concern]; a web server; even on desktop when the user inadvertently unloads a bunch of modules).

> If I select TextModels.dir.New I
> do not get the documentation for the New function.

This is a limitation of the current BlackBox, not the language definition.

> My question concerned CREATING a Store extension, not USING it.

I apologize... hard to turn off the teaching regime ...

> After all unloading is not something a 'user' can do;
> it requires a 'Developers' license.)

Developers can run into this problem too :-)
The opening of BlackBox is promised to happen soon...

> Even in a 'safe' language you can't (shouldn't ?) provide
> complete protection to developers.
> They will always need access to SYSTEM.
> But this warns them when they need to take particular care.
> Doesn't unloading come into a similar category?

But in terms of Wojtek's example: where to put such a warning?
A textual warning in the program source makes sense if such situations can be statically found.
With say a web server, this seems problematic.

Cheers
Fyodor

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Received on Fri Nov 19 2004 - 14:10:48 UTC