No need to get complicated. If you don't want the script to die, don't use die.

my $lockfile = $destDir."loadqueue.lck";
while (!open my $fhLock, ">", $lockfile)
{
    print "Failed to open $lockfile: $!";
    sleep(3);       ### Changed from 3000 to 3 (parameter is seconds, 
+not milliseconds!)
}
[download]

As to why it's failing -- without more information, hard to tell. My guess is that in the process of opening a file -- usually an atomic operation -- the thread may have stepped on something another thread was doing (or vice versa), and failed without a highly visible cause.

Thus, my first stab at a workaround was to let it breathe 3 seconds (or whatever is appropriate for the environment) and try again.

Edit: Changed sleep(3000)to sleep(3)(stupid human tricks when switching back and forth between languages)

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