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Postings from April 2018
On Tue, Apr 10, 2018 at 06:42:44AM -0700, Sergey Aleynikov via RT wrote:
> As for the core, I agree that it's now much more thread-stable than
> before. Somewhere around 5.12 or 5.14 I've prepared a talk named "no
> threads" with some nice crash examples in it - they crash no more. But
> still, locale handling was thread-unsafe until 5.24 (or 5.26?) - just
> because of no one has discovered that. And the following still fails
> loudly (though not dumps a core);
>
> while (1) {
> push @foo, threads->create(sub {
> require IO::Handle;
> });
> $_->detach for(splice @foo);
> }
Oh, that's fun, Looks like _create_getline_subs in IO.xs is directly
modifying the global PL_check[] rather than via the official API which
does the necessary locking.
> So while yes, perl is much more thread-safe inherently as it used to be,
> I won't recommend using threads in it to anyone.
Perl has bugs. Perl's threading has bugs. I haven't seen any particular
evidence yet that the number of threaded bugs is disproportionately large
on recent perls.
--
The Enterprise successfully ferries an alien VIP from one place to another
without serious incident.
-- Things That Never Happen in "Star Trek" #7
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