[Haskell-cafe] Yesod and concurrency

[Ertugrul Soeylemez]

Michael Snoyman <michael at snoyman.com> wrote:

> On Mon, Jan 31, 2011 at 1:09 PM, Ertugrul Soeylemez <es at ertes.de> wrote:
>
> > how well do WAI, Yesod and the 'persistent' package play with
> > concurrency?  For example, I'd like to write a program, which
> > concurrently provides two related sites as well as a few background
> > workers, which do something with the database.  My idea would look
> > something like this:
> >
> >  main :: IO ()
> >  main =
> >    withMyAppPool $ \pool -> do
> >      forkIO $ worker1 ...   -- background worker
> >      forkIO $ worker2 ...   -- background worker
> >      forkIO $ worker3 ...   -- background worker
> >      forkIO $ toWaiApp ...  -- site 1
> >      forkIO $ toWaiApp ...  -- site 2
> >
> > Will I run into problems with this?
>
> There should not be any issues, just make sure you compile with
> -threaded. The persistent database connection pool should work just
> fine for this. If you find any issues, please let me know, but I have
> not had trouble in the past.

I've run into the first problem with this.  Without having to use
subsites, what's an easy method to use wai-handler-devel with such a
setup?


Greets,
Ertugrul


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