If it's a timing issue, you could just keep trying. Something like 
bjmsys("xspec - ${tmp}.xcm", $v);
my $tries = 10; 
until ( open(DAT, "${tmp}xsfit.dat") || --$tries <= 0 ) { sleep 1; }
die ("Could not open file: $!") if ($tries <= 0); 
my @kT=<DAT>; close DAT;

[download]
Not quick, but dirty :)

In reply to Re^3: Runing "regular" code with threaded perl by Anonymous Monk
in thread Runing "regular" code with threaded perl by kingskot

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