[Rd] Using .onUnload() to unload compiled code

From: James MacDonald <jmacdon_at_med.umich.edu>
Date: Wed 08 Feb 2006 - 16:37:38 GMT


If one wants to unload compiled code for a package containing a namespace, my understanding is that .onUnload() should be used, with a call to library.dynam.unload(). This is used in e.g., the stats and methods packages, but it appears to me that the compiled code is not being unloaded when the package is detached(). Am I misunderstanding something?

Best,

Jim

> search()

[1] ".GlobalEnv"        "package:methods"   "package:stats"     "package:graphics" 
[5] "package:grDevices" "package:utils"     "package:datasets"  "Autoloads"        
[9] "package:base"     

> stats:::.onUnload

function (libpath)
library.dynam.unload("stats", libpath)
<environment: namespace:stats>

> getLoadedDLLs()

                                                   Filename Dynamic.Lookup
base                                                   base          FALSE
iconv                        C:/rw2030dev/modules/iconv.dll           TRUE
grDevices C:/rw2030dev/library/grDevices/libs/grDevices.dll          FALSE
stats             C:/rw2030dev/library/stats/libs/stats.dll          FALSE
methods       C:/rw2030dev/library/methods/libs/methods.dll          FALSE

> detach(3)

> search()

[1] ".GlobalEnv"        "package:methods"   "package:graphics"  "package:grDevices"
[5] "package:utils"     "package:datasets"  "Autoloads"         "package:base"  
   

> getLoadedDLLs()
Filename Dynamic.Lookup base base FALSE iconv C:/rw2030dev/modules/iconv.dll TRUE grDevices C:/rw2030dev/library/grDevices/libs/grDevices.dll FALSE stats C:/rw2030dev/library/stats/libs/stats.dll FALSE methods C:/rw2030dev/library/methods/libs/methods.dll FALSE
> R.version
_ platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status Under development (unstable) major 2 minor 3.0 year 2006 month 01 day 01 svn rev 36947 language R
version.string Version 2.3.0 Under development (unstable) (2006-01-01 r36947)

James W. MacDonald
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109
734-647-5623



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