[Rd] multi-threaded R current status?
Warnes, Gregory R
Fri, 12 Apr 2002 16:23:26 -0400
> -----Original Message-----
> From: Duncan Temple Lang [mailto:firstname.lastname@example.org]
> Sent: Friday, April 12, 2002 3:26 PM
> To: Warnes, Gregory R
> Cc: 'Remail@example.com'
> Subject: Re: [Rd] multi-threaded R current status?
> I plan to attack this in mid May unless Luke or others get there
> first. As I have mentioned before, making the R engine reentrant
> and/or thread-safe will probably not be all that is needed for your
> purposes, and fixing the packages, especially those with native (C,
> C++ & Fortran) code is also necessary. That is why I have been working
> on a tool that aids in the task of removing the global variables.
Thanks for the status report. I'm a firm believer in creating tools to
automate pesky repetitive tasks.
Once the core of R is reentrant/thread-safe, perhaps it would be possible to
get 90% of the way to fully reentrant/thread-safe by modifying .C /
.Fortran / friends to include a lock that prevent more than one thread at a
time from accessing functions within the same library (unless, of course,
the library is flagged as thread-safe.)
> Also, it may be prudent to prioritize an adequate security model in
> your application over allowing concurrent intrusions :-)
Yes, I've already been thinking about security. For the moment, I'm
building this tool strictly for trusted environments where security
shouldn't be a problem, and I'm not directly exposing R commands to the end
Still, I'm already running the server as 'nobody' to lessen the potential
for trouble, and I've been considering how to run this within a chroot jail
which contains only the necessary files to run R.
R has a *lot* of features that allow access to the underlying system and
that could potentially be used to do nasty things, particularly if the user
is allowed to provide arbitrary R code. Of course, so do all of our
favorite CGI languages. That's part of what makes them useful ;^)
> Warnes, Gregory R wrote:
> > Hi All,
> > What is the current status of removing the global variables
> etc that is
> > required to permit multi-threading R?
> > I'm developing a web application tool for/using R, python
> > and Zope (www.zope.org), and it would be really convenient
> if I could use
> > something like RPy to communicate with several concurrent R
> > preferably within the same process space.
> > -Greg
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