To my question about safety of
>> toA_IO = openFd "toA" WriteOnly Nothing defaultFileFlags
>> fromA_IO = openFd "fromA" ReadOnly Nothing defaultFileFlags
>> toA = unsafePerformIO toA_IO
>> fromA = unsafePerformIO fromA_IO
>>
>> axiomIO :: String -> IO String
>> axiomIO str = do
>>
Hi,
On 14.01.2012, at 12:11, Serge D. Mechveliani wrote:
> On Fri, Jan 13, 2012 at 12:19:34PM -0800, Donn Cave wrote:
>> Quoth "Serge D. Mechveliani" ,
>> ...
>>> Initially, I did the example by the Foreign Function Interface for C.
>>> But then, I thought "But this is unnatural! Use plainly the
On Sat, Jan 14, 2012 at 11:57, Donn Cave wrote:
> I don't know. When I was younger, I used to track these problems down
> and try to explain in detail why buffered I/O is a bad bet with pipes,
> sockets etc. I don't think anyone listened. I think I am going to
> experiment with "I am old, so l
Quoth "Serge D. Mechveliani" ,
> By openFile you, probably, mean openFd.
Yes, sorry!
> Another point is the number of open files, for a long loop.
...
> toA_IO = openFd "toA" WriteOnly Nothing defaultFileFlags
...
> When applying axiomIO in a loop of 9000 strings, it breaks:
> "too ma
On Fri, Jan 13, 2012 at 12:19:34PM -0800, Donn Cave wrote:
> Quoth "Serge D. Mechveliani" ,
> ...
> > Initially, I did the example by the Foreign Function Interface for C.
> > But then, I thought "But this is unnatural! Use plainly the standard
> > Haskell IO, it has everything".
> >
> > So, your a
Quoth "Serge D. Mechveliani" ,
...
> Initially, I did the example by the Foreign Function Interface for C.
> But then, I thought "But this is unnatural! Use plainly the standard
> Haskell IO, it has everything".
>
> So, your advice is "return to FFI" ?
Well, it turns out that the I/O system functi
On Fri, Jan 13, 2012 at 04:34:37PM +0100, Chadda?? Fouch?? wrote:
> On Thu, Jan 12, 2012 at 7:53 PM, Serge D. Mechveliani
> wrote:
> > [..]
> > I need to organize a string interface for a Haskell function
> > Main.axiom and a C program
> > fifoFromA.c
> >
> > via a p
On Fri, Jan 13, 2012 at 13:23, Michael Craig wrote:
> Brandon, can you elaborate? Are you talking about UNIX named pipes or
> FIFO/queue data structures in general?
I mean POSIX named pipes. They work, but they don't do what most people
think they do, and they're rather annoying to work with i
On Fri, Jan 13, 2012 at 10:08:04AM -0800, Donn Cave wrote:
> Quoth "Serge D. Mechveliani" ,
> [ ... why in Haskell instead of FFI ... ]
>
> > Because it is a direct and the simplest approach. Why does one need a
> > foreign language, if all the needed functions are in the standard
> > Haskell lib
I (Sergei) am invesigating (so far) only Unix named pipes.
> > I hope you are aware of the many "gotchas" involved with FIFOs.
> > There are very good reasons why they are not widely used.
At least in C <-> C, the Unix named pipes do work.
And I am trying to replace the first end with Haskell.
Brandon, can you elaborate? Are you talking about UNIX named pipes or
FIFO/queue data structures in general?
Mike Craig
On Fri, Jan 13, 2012 at 12:39 PM, Brandon Allbery wrote:
> On Fri, Jan 13, 2012 at 12:25, Serge D. Mechveliani wrote:
>
>> On Fri, Jan 13, 2012 at 04:34:37PM +0100, Chadda??
Quoth "Serge D. Mechveliani" ,
[ ... why in Haskell instead of FFI ... ]
> Because it is a direct and the simplest approach. Why does one need a
> foreign language, if all the needed functions are in the standard
> Haskell library?
The GHC Haskell library makes some compromises with normal I/O
f
On Fri, Jan 13, 2012 at 12:25, Serge D. Mechveliani wrote:
> On Fri, Jan 13, 2012 at 04:34:37PM +0100, Chadda?? Fouch?? wrote:
> > Now that seems interesting, but just to be clear : did you choose
> > this solution (and why won't you use the FFI instead) or is this just
> > to see how to work it
On Fri, Jan 13, 2012 at 04:34:37PM +0100, Chadda?? Fouch?? wrote:
> On Thu, Jan 12, 2012 at 7:53 PM, Serge D. Mechveliani
> wrote:
> > People,
> >
> > (I wonder: is this for beginn...@haskell.org ?)
>
> I don't think so.
>
> >
> > I need to organize a string interface for a Haskell function
On Thu, Jan 12, 2012 at 7:53 PM, Serge D. Mechveliani wrote:
> People,
>
> (I wonder: is this for beginn...@haskell.org ?)
I don't think so.
>
> I need to organize a string interface for a Haskell function
> Main.axiom and a C program
> fifoFromA.c
>
> via a pair o
Quoth "Serge D. Mechveliani" ,
> (I wonder: is this for beginn...@haskell.org ?)
No, not really! As already mentioned, the use of UnsafePerformIO
goes a little beyond what I think is its intended purpose, and I
think you might have better luck here with a test program that
illustrates the probl
On 01/12/2012 07:53 PM, Serge D. Mechveliani wrote:
[...]
>
For the "to-A" part writen in C (instead of Haskell), this interface
loop works all right.
With Haskell, I manage to process only a single string in the loop,
and then it ends with an error.
Main.hs is given below.
I never dealt w
People,
(I wonder: is this for beginn...@haskell.org ?)
I need to organize a string interface for a Haskell function
Main.axiom and a C program
fifoFromA.c
via a pair of named pipes (in Linux, UNIX).
The pipes are created before running, by the commands
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