data type ByteBuffer

data type ByteBuffer

[Steven Wu]

I wonder if there is a built-in simple data type like ByteBuffer in 
Java, or Message_Block in ACE. It seems to me, when dealing with 
network programing, such a data type can be very efficient. The 
Message_Block in ACE emulates SysV message block used in device driver 
with reference counting, and the concept of adding continue blocks. It 
shouldn't be very hard to implement the similar thing in guile.

steve



_______________________________________________
Guile-devel mailing list
Guile-devel@gnu.org
http://mail.gnu.org/mailman/listinfo/guile-devel

Re: data type ByteBuffer

[Andreas Rottmann]

"Steven Wu" <wus@qwest.net> writes:

> I wonder if there is a built-in simple data type like ByteBuffer in
> Java, or Message_Block in ACE. It seems to me, when dealing with
> network programing, such a data type can be very efficient. The
> Message_Block in ACE emulates SysV message block used in device driver
> with reference counting, and the concept of adding continue blocks. It
> shouldn't be very hard to implement the similar thing in guile.
>
I've lately added GString support to the Guile GLib bindings, which
can be used like a ByteBuffer, but isn't refcounted. I agree that such
a data type would indeed be useful.

Andy
-- 
Andreas Rottmann         | Rotty@ICQ      | 118634484@ICQ | a.rottmann@gmx.at
http://yi.org/rotty      | GnuPG Key: http://yi.org/rotty/gpg.asc
Fingerprint              | DFB4 4EB4 78A4 5EEE 6219  F228 F92F CFC5 01FD 5B62

Beware of bugs in the above code; I have only proved it correct,
not tried it.  -- Donald E. Knuth



_______________________________________________
Guile-devel mailing list
Guile-devel@gnu.org
http://mail.gnu.org/mailman/listinfo/guile-devel

Re: data type ByteBuffer

[Clinton Ebadi]

[-- Attachment #1.1: Type: text/plain, Size: 1017 bytes --]

On Thu, 2004-05-06 at 03:39, Steven Wu wrote:
> I wonder if there is a built-in simple data type like ByteBuffer in 
> Java, or Message_Block in ACE. It seems to me, when dealing with 
> network programing, such a data type can be very efficient. The 
> Message_Block in ACE emulates SysV message block used in device driver 
> with reference counting, and the concept of adding continue blocks. It 
> shouldn't be very hard to implement the similar thing in guile.
> 
> steve

Would a uniform byte vector (or array if you need more than one
dimension) work?

(make-uniform-vector size #\nul &fill)

You can use the helper procedures uniform-vector-read! and
uniform-vector-write to read and write data from/to a port or a file
descriptor. Uniform vectors and arrays are documented in the Guile
manual, (guile)->Compound Data Types->Arrays->Uniform Arrays.
-- 
http://unknownlamer.org
AIM:unknownlamer IRC:unknown_lamer@freenode#hprog
I use Free Software because I value freedom over features.

[-- Attachment #1.2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 189 bytes --]

[-- Attachment #2: Type: text/plain, Size: 142 bytes --]

_______________________________________________
Guile-devel mailing list
Guile-devel@gnu.org
http://mail.gnu.org/mailman/listinfo/guile-devel

Re: data type ByteBuffer

[Steven Wu]

On May 8, 2004, at 8:44 AM, Clinton Ebadi wrote:

> On Thu, 2004-05-06 at 03:39, Steven Wu wrote:
>> I wonder if there is a built-in simple data type like ByteBuffer in
>> Java, or Message_Block in ACE. It seems to me, when dealing with
>> network programing, such a data type can be very efficient. The
>> Message_Block in ACE emulates SysV message block used in device driver
>> with reference counting, and the concept of adding continue blocks. It
>> shouldn't be very hard to implement the similar thing in guile.
>>
>> steve
>
> Would a uniform byte vector (or array if you need more than one
> dimension) work?
>
> (make-uniform-vector size #\nul &fill)
>

uniform vector can be used to implement the Message_Block, or 
Message_Block, however, if we extend the guile and make Message_Block 
into a compound type, it certainly increase the efficiency. The 
difference between uniform vector and Message_Block is that the 
Message_Block is a list of uniform vectors, but it is seen to users as 
one continuous block. Especially, when it can be easily convert to 
iovec, and write to a fd with one sys-call writev, and that is 
certainly more effective then multiple write.

steve



_______________________________________________
Guile-devel mailing list
Guile-devel@gnu.org
http://mail.gnu.org/mailman/listinfo/guile-devel