From: Bulat Ziganshin <[EMAIL PROTECTED]> Subject: Re: ForeignPtr and -threaded Date: Sun, 22 Jul 2007 17:48:05 +0400
> try to add performGC at end - this should force collecting garbage and
> therefore printing of string. otherwise, it's ok - there is no guarantee
> that GC will be performed and therefore that you finalizer will be
> performed. it's rather stanard behavior for GC languages - finalizers
> are almosr useless there
So I changed the code like this but the result was exactly the
same. The documentations of both Foreign.ForeignPtr (*1) and
Foreign.Concurrent (*2) say "The only guarantee is that the finalizer
runs before the program terminates." So I expected the finalizer to be
called.
import Foreign.Marshal.Alloc
import Foreign.Ptr
import Foreign.ForeignPtr
import System.Mem
import qualified Foreign.Concurrent as Conc
main = work >> performGC
where
work = do mem <- mallocBytes 10
Conc.newForeignPtr mem $ print "called"
*1:
http://haskell.org/ghc/docs/latest/html/libraries/base/Foreign-ForeignPtr.html
*2:
http://haskell.org/ghc/docs/latest/html/libraries/base/Foreign-Concurrent.html
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