I've added a FAQ.
Simon
| -Original Message-
| From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
| Simon Marlow
| Sent: 15 December 2005 09:26
| To: Bulat Ziganshin
| Cc: Haskell-Cafe Cafe
| Subject: RE: Re[2]: [Haskell-cafe] Unbound threads and FFI
|
| On 14 December 2005 18:04, Bulat Ziganshin wrote:
|
| Hello Simon,
|
| Wednesday, December 14, 2005, 7:39:43 PM, you wrote:
|
| Do other Haskell threads get blocked during an FFI call?
|
|| safeunsafe
| --+
| -threaded| NO YES
| no -threaded | YES YES
|
| there is also `threadsafe` specifier. i don't understand from the
docs
| what it exactly means?
|
| ghc commentary says:
|
| To signal that you want an external call to be serviced by a
separate
| OS thread, you have to add the attribute threadsafe to a foreign
| import declaration, i.e.,
|
| foreign import bigComp threadsafe largeComputation :: Int - IO ()
|
| The distinction between 'safe' and thread-safe C calls is made so
that
| we may call external functions that aren't re-entrant but may cause
a
| GC to occur.
|
| The threadsafe attribute subsumes safe.
|
| threadsafe is deprecated; it is currently exactly the same as safe.
We
| thought at one time that it would be useful to have the distinction,
but
| it turned out to be impractical to implement safe that wasn't also
| threadsafe.
|
| Cheers,
| Simon
| ___
| Haskell-Cafe mailing list
| Haskell-Cafe@haskell.org
| http://www.haskell.org/mailman/listinfo/haskell-cafe
___
Haskell-Cafe mailing list
Haskell-Cafe@haskell.org
http://www.haskell.org/mailman/listinfo/haskell-cafe