Hi all, I'm trying to use the RSPerl module in a script that uses threads. I am able to call R functions without a problem when I don't use threads. However, using threads, I get varying errors depending on how I call the R functions. If I call the R::initR function in the "boss" thread and then try to call R functions from a "worker" thread, I get the following error: Error: C stack usage is too close to the limit Caught error in R::call() However, if I move the "use" declarations for R & RReferences to the worker thread, along with the initR call, I get this: Fatal error: R home directory is not defined I've attached some code for your reference. Is there any way to get this module working with Perl threads? Thanks in advance for your help. -Jay 
#!/usr/bin/perl

use warnings;
use strict;

#use R;
#use RReferences;
#&R::initR("--silent");

use threads;
use threads::shared;
use Thread::Queue;

our $queue : shared = Thread::Queue->new;
our $hold : shared;

my $thr = threads->new (\&command_runner);

$hold =1;
$queue->enqueue("ls");
while ($hold) {
    sleep(1);
}
$queue->enqueue("end");

$thr->join();

# Thread for processing functions
sub command_runner {

    use R;
    use RReferences;
    &R::initR("--silent");

    my $run = 1;
    # run until return
    while ($run) {
        # This call will block until the main thread sends the job
        my $job = $queue->dequeue;

    print "j: $job\n";

    if ($job eq "ls"){
        R::ls();
        } elsif ($job eq "end") {
            $run = 0
        }
        { lock $hold; $hold = 0; }
    }
   
}

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In reply to RSperl & threads by sperlyjinx

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