[R] dyn.unload

[Prof Brian Ripley]

On Wed, 6 Feb 2002, Christian Hennig wrote:

> Dear list,
>
> I want to write a package which loads a C library dynamically.
>
> It seems that it is not possible to unload the library using dyn.unload
> (for example with detach, .Last.lib)
> if it has been loaded with library.dynam in .First.lib.
>
> dyn.unload in my experience only unloads libraries
> successfully which have been loaded by dyn.load.

And as library.dynam calls dyn.load, that includes those loaded by
library.dynam!  Are you calling dyn.unload with the correct argument?

> So how to unload libraries which were loaded in .First.lib (dyn.load seems
> to be discouraged for .First.lib)?

There is a working example in library(tcltk) under Windows.  You need
also to remove the entry in .Dyn.libs for library.dynam to work on
the same package again.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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