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Thread-safe singleton in perl

by Saladino (Beadle)
on Mar 19, 2008 at 18:48 UTC ( [id://675062]=perlquestion: print w/replies, xml ) Need Help??

Saladino has asked for the wisdom of the Perl Monks concerning the following question:

Hi monks, I'd like to know if it is technically possible to have a thread-safe singleton in perl 5.8.8. I mean, my problem now is that I've to share the object reference and threads::shared doesn't allow that. I've been looking this url: http://perlmonks.org/?node_id=237710 But at this moment it segfaults in my Debians perl 5.8.8 . Any hints?

Replies are listed 'Best First'.
Re: Thread-safe singleton in perl
by pc88mxer (Vicar) on Mar 19, 2008 at 19:01 UTC
    It also segfaults on my Ubuntu box. However, changing 
     my @threads = threads->new( \&worker, \$_ ) for @flags;

    [download]
    to: 
    my @threads;
for my $i (0..$#flags) {
  push(@threads, threads->new(\&worker, \$flags[$i]);
}

    [download]
    makes the example work for me.
[reply]
[d/l]
[select]
Re: Thread-safe singleton in perl
by renodino (Curate) on Mar 19, 2008 at 19:26 UTC
    my problem now is that I've to share the object reference and threads::shared doesn't allow that.

    Care to elaborate on that ? I've certainly used shared objects on numerous occasions. (There is a small gotcha related to DESTROY that has a fix in perl 5.10 + latest CPAN version of threads::shared).

    Presumably, you simply need to bless a shared variable for the object. See threads::shared Objects description for details.

    Perl Contrarian & SQL fanboy
[reply]

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