Galchin, Vasili [EMAIL PROTECTED] writes:
ok guys .. what is this phantom type concept? Is it a type theory thing or
just Haskell type concept?
Here's another example. Say you want to use bytestrings with
different encodings. You obviously don't want to concatenate a string
representing
On 2008 Jul 28, at 1:54, Galchin, Vasili wrote:
allocaBytes (#const sizeof(struct aiocb)) $ \ p_aiocb - do
poke p_aiocb aiocb
As I understand it, you can't do this;you must use the same aiocb
throughout (that is, the same chunk of memory, not merely the same
values; there is
Hi Brandon,
So even if I go to ForeignPtr is a problem? And/Or is this a by
reference vs by value issue?
Kind regards, Vasili
On Mon, Jul 28, 2008 at 1:09 AM, Brandon S. Allbery KF8NH
[EMAIL PROTECTED] wrote:
On 2008 Jul 28, at 1:54, Galchin, Vasili wrote:
allocaBytes (#const
Hi Brandon,
So based on what you are saying I kind of need a Haskell AIO
imperative/monadic function that basically returns a handle that is
associated with this AIOCB chunk-of-memory This handle gets passed
around during an AIO I/O session?? Sorry for talking too imperatively ;^)
On 2008 Jul 28, at 2:36, Galchin, Vasili wrote:
Hi Brandon,
So even if I go to ForeignPtr is a problem? And/Or is this a
by reference vs by value issue?
As I read your code, you're allocating a C object, poking the Haskell
fields into it, and passing it on, then peeking the
On 2008 Jul 28, at 2:41, Galchin, Vasili wrote:
So based on what you are saying I kind of need a Haskell AIO
imperative/monadic function that basically returns a handle that
is associated with this AIOCB chunk-of-memory This handle gets
passed around during an AIO I/O session??
Brandon,
Your reading on my code is quite correct. So you are suggesting that
the Haskell aiocb contain a ForeignPtr to actual aiocb that is passed the C
functions. In this scenario, whose responsibility to allocate the chunk of
memory for the aiocb?
Vasili
On Mon, Jul 28, 2008 at 2:04
So at the moment you're using using Storable and a Haskell record, say:
data AIOCB = AIOCB {
...
}
and we're suggesting instead:
newtype AIOCB = AIOCB (ForeignPtr AIOCB)
^^^ I am somewhat new to Haskell. Not a total newbie! But what exactly
does the above mean? Are the three
2008/7/28 Galchin, Vasili [EMAIL PROTECTED]:
and we're suggesting instead:
newtype AIOCB = AIOCB (ForeignPtr AIOCB)
^^^ I am somewhat new to Haskell. Not a total newbie! But what exactly
does the above mean? Are the three references of AIOCB in different
namespaces?
The first and the
Thanks, Felipe.
On Mon, Jul 28, 2008 at 8:01 PM, Felipe Lessa [EMAIL PROTECTED]wrote:
2008/7/28 Galchin, Vasili [EMAIL PROTECTED]:
and we're suggesting instead:
newtype AIOCB = AIOCB (ForeignPtr AIOCB)
^^^ I am somewhat new to Haskell. Not a total newbie! But what
exactly
what does a datatype with no constructors mean?
E.g.
data RSAStruct
data EVP_PKEY
data EVP_CIPHER
data EVP_CIPHER_CTX
data EVP_MD_CTX
data EVP_MD
data BIGNUM
On Mon, Jul 28, 2008 at 8:01 PM, Felipe Lessa [EMAIL PROTECTED]wrote:
2008/7/28 Galchin, Vasili [EMAIL PROTECTED]:
and we're
On Mon, Jul 28, 2008 at 08:48:23PM -0500, Galchin, Vasili wrote:
what does a datatype with no constructors mean?
E.g.
data RSAStruct
data EVP_PKEY
data EVP_CIPHER
data EVP_CIPHER_CTX
data EVP_MD_CTX
data EVP_MD
data BIGNUM
It's simply a datatype that can never have a value - a
ok guys .. what is this phantom type concept? Is it a type theory thing or
just Haskell type concept?
Vasili
On Mon, Jul 28, 2008 at 8:53 PM, Bryan Donlan [EMAIL PROTECTED] wrote:
On Mon, Jul 28, 2008 at 08:48:23PM -0500, Galchin, Vasili wrote:
what does a datatype with no constructors mean?
Excerpts from Galchin, Vasili's message of Mon Jul 28 21:14:56 -0500 2008:
ok guys .. what is this phantom type concept? Is it a type theory thing or
just Haskell type concept?
Vasili
Phantom types are more of an idiom than anything else; they are types
with no real concrete representation,
Hi Duncan and Brandon,
I am moving to the ForeignPtr strategy. However, I always try to learn
from where I am before going to a new approach. I have discovered by
debugging that the AIOCB peek is working; however, passing the peeked
AIOCB back to the caller(i.e. the test program) is not
On Mon, Jul 21, 2008 at 01:05:48PM +1200, Richard A. O'Keefe wrote:
I think it may be time for a little clarity about aoicb's.
From the Single Unix Specification:
The aio.h header shall define the aiocb structure
which shall include AT LEAST the following members:
int
In order to write portable code that accesses C structures, you need to
write a c shim, or better, use the 'hsc2hs' tool to produce portable
code. For an example, you can see my OpenSSL binding code in
http://repetae.net/repos/ginsu/RSA.hsc
in particular the 'createPkey' function. the #ptr
On Sat, 2008-07-19 at 23:55 -0500, Galchin, Vasili wrote:
yes Duncan I am trying to pass-by-value. I am familiar with
ForeignPtr; however, I don't comprehend what you and Brandon are
suggesting to do. Could either of you provide a code illustration or
point at existing code to illustrate your
I think it may be time for a little clarity about aoicb's.
From the Single Unix Specification:
The aio.h header shall define the aiocb structure
which shall include AT LEAST the following members:
int aio_fildes File descriptor.
off_t aio_offset File
On 2008 Jul 20, at 21:05, Richard A. O'Keefe wrote:
For asynchronous I/O, this means that
- you can allocate an aiocb object
- an aiocb passed to aio_suspend, aio_error,
aio_return, or aio_cancel should have been
filled in by aio_read or aio_write and should
be EXACTLY THE SAME object,
Thank you Duncan for your example. I will also read the RSA code.
Regards, Vasili
On Sun, Jul 20, 2008 at 6:51 AM, Duncan Coutts [EMAIL PROTECTED]
wrote:
On Sat, 2008-07-19 at 23:55 -0500, Galchin, Vasili wrote:
yes Duncan I am trying to pass-by-value. I am familiar with
ForeignPtr;
hello,
Following is more of a criticism of Linux implementation of the Posix
real-time extension of asynchronous I/O if not interesting please skip.
The central data structure for Posix AIO is an aiocb. In any case, the Linux
implementors added to the aiocb:
/* Asynchronous I/O control
On 2008 Jul 19, at 2:40, Galchin, Vasili wrote:
My viewpoint is that the above Internal members must be carried
around in a Haskell program. Am I correct?? If I am correct, then
the Linux implementation of Posix AIO is not portable to say
Solaris? In hindsight, if I am correct, it seems
On Sat, 2008-07-19 at 01:40 -0500, Galchin, Vasili wrote:
hello,
Following is more of a criticism of Linux implementation of the
Posix real-time extension of asynchronous I/O if not interesting
please skip. The central data structure for Posix AIO is an aiocb. In
any case,
On Sat, 2008-07-19 at 10:45 -0400, Brandon S. Allbery KF8NH wrote:
On 2008 Jul 19, at 2:40, Galchin, Vasili wrote:
My viewpoint is that the above Internal members must be carried
around in a Haskell program. Am I correct?? If I am correct, then
the Linux implementation of Posix AIO is
Brandon,
You lost me can you explain what an opaque aiocb would look like?
Vasili
On Sat, Jul 19, 2008 at 9:45 AM, Brandon S. Allbery KF8NH
[EMAIL PROTECTED] wrote:
On 2008 Jul 19, at 2:40, Galchin, Vasili wrote:
My viewpoint is that the above Internal members must be carried
On 2008 Jul 19, at 16:42, Galchin, Vasili wrote:
You lost me can you explain what an opaque aiocb would
look like?
In Haskell, it's a ForeignPtr --- you can't see inside it except by
FFI calls. Although Duncan is correct and you can use an FFI
preprocessor to access the
yes Duncan I am trying to pass-by-value. I am familiar with ForeignPtr;
however, I don't comprehend what you and Brandon are suggesting to do. Could
either of you provide a code illustration or point at existing code to
illustrate your approach?
Kind regards, Vasili
On Sat, Jul 19, 2008 at 8:28
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