Hi all,

i figured this out by RTFM:

#!/usr/bin/env perl

use strict;
use warnings;
use threads;
use threads::shared;
use Thread::Semaphore;
use Math::BigInt;
use Data::Dump;
use feature qw(say);

my @numbers = ( 1 .. 10 );
my %result : shared;
my $semaphore = Thread::Semaphore->new(4);

my @threads = map {
    $semaphore->down;
    threads->create( \&process, $_ );
} @numbers;

$_->join for @threads;

dd \%result;

sub process {
    my $number    = shift;
    my $factorial = factorial($number);
    say qq($number $factorial);
    eval { $result{$number} = $factorial; };
    say $@ if $@;
    $semaphore->up;
}

sub factorial {
    my $number = shift;
    Math::BigInt->bfac($number);
}

__END__

karls-mac-mini:monks karl $ ./semaphore.pl 
...
10 3628800
Invalid value for shared scalar at ./semaphore.pl line 29.
...

[download]

It works, but the only thing i couldn't manage is to assign the results to a hash.

I did some more RTFM about how to accomplish this but without success.

What do i miss?

Thank you very much for any hint and best regards,

Karl

P.S.: I asked something similar at noon it the CB and posted an example in my scratchpad. Corion kindly advised my not to use Thread::Semaphore and pointed me to the canonical advice given by BrowserUK which uses Thread::Queue. But i couldn't resist to use Thread::Semaphore

«The Crux of the Biscuit is the Apostrophe»

In reply to Threads From Hell #1: How To Share A Hash [SOLVED] by karlgoethebier

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