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Re^3: Converting a parallel-serial shell script

by BrowserUk (Pope)
on Sep 18, 2008 at 12:50 UTC ( #712271=note: print w/ replies, xml ) Need Help??

in reply to Re^2: Converting a parallel-serial shell script
in thread Converting a parallel-serial shell script

Updated: This modified version actually terminates. ++Corion

Needs some error checking, but this should work:

#! perl -slw use strict; use threads; use Thread::Queue; our $THREADS ||= 4; my $Qraw = new Thread::Queue; my $Qtsv = new Thread::Queue; sub convert{ $_[ 0 ] } sub toTSV { while( my $filename = $Qraw->dequeue ) { my $outFile = $filename . '.tsv'; open my $fhIn, '<', $filename or warn "$filename : $!" and nex +t; open my $fhOut, '>', $outFile or warn "$outFile : $!" and nex +t; while( <$fhIn> ) { my $tsv = convert( $_ ); print $fhOut $tsv; } close $fhOut; close $fhIn; $Qtsv->enqueue( $outFile ); } $Qtsv->enqueue( undef ); } my @threads = map threads->create( \&toTSV ), 1 .. $THREADS; ## Filenames from command line, 4 threads to terminate $Qraw->enqueue( @ARGV, (undef) x $THREADS ); for( 1 .. $THREADS ) { while( my $tsvFile = $Qtsv->dequeue ) { system "echo $tsvFile"; unlink $tsvFile; } } $_->join for @threads;

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

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