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Re^2: Perl Threads Boss/Worker Example

by sunkid (Initiate)
on Jul 11, 2013 at 02:47 UTC ( #1043620=note: print w/ replies, xml ) Need Help??

in reply to Re: Perl Threads Boss/Worker Example
in thread Perl Threads Boss/Worker Example

I realize that this is an old thread but I ran across this trying to solve a similar problem: run a specific number of threads to work on a set of issues. I thought it might be useful for others to know the correct implementation of Tanktalus' suggestion.

Basically, there were two issues that took me a while to sort out: firstly, the newly created threads are detached, which makes them impossible to join later; secondly (much less important), adding undef as a queue item isn't necessary when using dequeue_nb instead of dequeue.

The code that actually works for me looks like this:

#! /usr/bin/perl use threads; use Thread::Queue; my $q = Thread::Queue->new(); # A new empty queue # Send work to the threads $q->enqueue($_) for @ARGV; # Worker threads my $thread_limit = 8; my @thr = map { threads->create(sub { while (defined (my $item = $q->dequeue_nb())) { doStuff($item); } }); } 1..$thread_limit; # terminate. $_->join() for @thr;

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