Paul,
The GdH implementation is currently used here, and is basically in beta-release
form. If you would use it we could wrap up a and X86/Linux version for you.
The GUM implementation of GpH and GdH uses very simple communication (mainly
point to point, with a single barrier synchronisation,
Dear All,
Hal's comments on the use of Evaluation Strategies for controlling
strictness are substantially right, and they are used this way in Eden, a
parallel Haskell. In Glasgow parallel Haskell(GpH) we use them to control
parallel evaluation as well. The key reference is
Algorithm +
Hal
I don't quite understand the intuitions behind your program, but the
bug is easy enough:
| instance (Eq e, Foo p) = Foo (Wrap p) where
| foo (Bar p) e q = foo p e q
This instance declaration is guaranteed to give problems if it is
ever used, and GHC should probably bleat about it.
I don't know what you are trying to do, but I do know why your program
is rejected.
The *whole point* of a value of type (STArray s Int Int) is that it can
only
be read by a state thread with the same type parameter 's' as the array.
Given your decls
class Foo a where
foo :: a - IO Int
They aren't identical.
runST guarantees to run a complete state thread that can't interact
with any other. stToIO runs some imperative actions that might
interact with other stToIO calls.
You might find it helpful to read 'State in Haskell' if you havn't
already done so.
Simon
|
There are two things going on.
1. Hugs deals with mutual recursion in a more sophisticated
way than GHC. Mark T is absolutely right, and the THIH paper explains.
2. Furthermore,GHC implements the H98 requirement that the context of
all functions in a mutually recursive groups must be the
On Wed, Aug 28, 2002 at 10:46:34AM +0100, Phil Trinder wrote:
Paul,
The GdH implementation is currently used here, and is basically in
beta-release form. If you would use it we could wrap up a and
X86/Linux version for you.
That will be very sweet! I'd love to play with this thing ;-)
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I have a program that is suffering a select() failure. It prints:
9
select: Bad file descriptor
Fed: fatal error: select failed
From looking at some RTS sources, the 9 apparently represents
errno EBADF
(bad file descriptor). Does that mean that my program is
somehow closing
one
Please say which version of GHC you are using.
This program works fine with GHC 5.02.2
Simon
| -Original Message-
| From: Hal Daume III [mailto:[EMAIL PROTECTED]]
| Sent: 22 August 2002 20:47
| To: [EMAIL PROTECTED]
| Subject: bug with rank n polymorphism in classes
|
|
| consider:
Sorry, I haven't got time to narrow this down to a test case, but here are
what I hope are the key factors:
(1) We start up applications in a child process (forked with Posix.forkProcess)
by calling Posix.executeFile, wrapped in an Exception.catch handler (to detect
errors).
(2) Both the third
On Wed, 28 Aug 2002, Simon Marlow wrote:
I have a program that is suffering a select() failure. It prints:
9
select: Bad file descriptor
Fed: fatal error: select failed
From looking at some RTS sources, the 9 apparently represents
errno EBADF
(bad file descriptor). Does
No, this is a bug, thank you. Will fix.
Simon
| -Original Message-
| From: Ashley Yakeley [mailto:[EMAIL PROTECTED]]
| Sent: 19 August 2002 11:31
| To: Jay Cox; Haskell Cafe List
| Subject: Re: Question aboutthe use of an inner forall
|
|
| At 2002-08-18 20:19, Jay Cox wrote:
|
|
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