I was checking forks.pm
to make sure it will run under 5.8.1 (it will) and finally looked at the problem of running it under 5.6.x (it doesn't).
This is basically the problem:
share( $variable );
The share subroutine is actually an XS routine that has this special prototype:
This prototype was introduced somewhere in the 5.7 track. So in 5.6.x I can't use that (I verified this on p5p). Simply removing the prototype and then having to specify a reference when calling share(), works:
share( \$variable );
Of course, it doesn't work in 5.8.x then, but I think that's fixable. But then the user's source code becomes incompatible with the real threads
So before I start doing that, I figure I put the dilemma to the Monks. I see the following options:
- Forget about supporting pre 5.8.x
This is sad, because one of the reasons for me to develop forks.pm was to allow people to try out threaded programming in 5.6.x without having to upgrade. The only advantage to this proposal would be that you do not need a threaded 5.8.x perl to be able to run (as opposed to threads.pm, which needs perl with threads enabled).
- Support 5.6.x, forces references everywhere
This would make the user's source incompatible with current threads and forks users. So if you would want to migrate to "true" threads, you would need to change your code with every call to share(), lock(), cond_wait(), etc. But it would allow you to migrate from 5.6.x to 5.8.x without any problem.
- Support 5.6.X, force references in 5.6.x, force direct otherwise
This would mean that when code using forks is migrated from 5.6.x to 5.8.x or higher, it stops working because you need to remove the reference from each call to share(), lock() etc.
Any suggestions with regards to this dilemma are deeply appreciated.
It seems possible to use a source filter for 5.6.x. I think I'll give that a try. Thanks everyone for their feedback!
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