asio-users — General discussion about the asio C++ library.

Re: [asio-users] how to do?

[Alex O. <ot...@je...>]

Hello Christopher

Yep, my code now running at work - i had updated to the latest CVS and 
now it works

Christopher Kohlhoff wrote:
> Hi Alex,
>
> Alex Ott <ot...@je...> wrote:
>   
>> I had run you code on my home computer, and it works fine. my
>> code, that was broken, also run fine with in_avail function.
>> Now i try to understand, why it throw exception on my work
>> computer, may be i need to update my boost distro (home i had
>> tried boost from cvs)
>>     
>
> Any luck trying it again at work? Did you manage to work out
> what was different?
>
> Cheers,
> Chris
>
>
>
>
> -------------------------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> asio-users mailing list
> asi...@li...
> https://lists.sourceforge.net/lists/listinfo/asio-users
>   

-- 
With best wishes,      Alex Ott
Jet Infosystems,       Head of software development group, MBA
+7 (495) 411 76 01     http://www.jetsoft.ru/ 

Re: [asio-users] asio in multithreaded server

[Jose <jm...@gm...>]

On 7/13/06, Christopher Kohlhoff <ch...@ko...> wrote:
>
> > A Multi-Threaded PIPELINED Web Server Architecture for SMP/SoC
> > machines http://www2005.org/cdrom/docs/p730.pdf
>
> Interesting. I would have thought that passing the work for a
> single request between many different threads would incur more
> costs due to the context switches, but you never know!


Apparently there are cache savings with the pipelined approach and
synchronization savings by using few threads vs the standard MT approach
with a
large number of threads

Re: [asio-users] asio in multithreaded server

[Christopher K. <ch...@ko...>]

 
Hi Jose,

Jose <jm...@gm...> wrote:
> I think HTTP is the protocol. You already have the
> single-threaded server example and might want to add the two
> thread-based cases you describe above (and even a thread-pool
> only example with no asio just for comparison)

Yeah, an implementation of the same HTTP server with many
different designs does sound like a good idea. Not something
I'll have time for in the next few months though :)

> For SMP and SoC architectures there is a pipelined
> architecture that makes a difference (it relies on a 7 thread
> pool for each processor) but am not sure how this could be
> implemented with asio+threads
>
> A Multi-Threaded PIPELINED Web Server Architecture for SMP/SoC
> machines http://www2005.org/cdrom/docs/p730.pdf

Interesting. I would have thought that passing the work for a
single request between many different threads would incur more
costs due to the context switches, but you never know! It could
be implemented in asio using an io_service object for each task
-- it's not really that different in principle to the design of
having an io_service per processor, you'd just have a pool of
io_service objects per processor instead.

> As for a simple example that requires the use of strands you
> could do something as simple as a counter where each request
> increments it  (from any thread that handled the request) and
> returns the value in the response

Yeah, something like that might do for now.

For something that's a really good showcase for strands I was
thinking a full-duplex protocol (compared to HTTP 1.0 which is
only half duplex and could be written without explicit strand
objects). But perhaps an implementation of an HTTP server that
supports pipelined requests could be enough. An HTTP proxy that
supports pipelining would be even better.

Cheers,
Chris

Re: [asio-users] how to do?

[Christopher K. <ch...@ko...>]

Hi Alex,

Alex Ott <ot...@je...> wrote:
> I had run you code on my home computer, and it works fine. my
> code, that was broken, also run fine with in_avail function.
> Now i try to understand, why it throw exception on my work
> computer, may be i need to update my boost distro (home i had
> tried boost from cvs)

Any luck trying it again at work? Did you manage to work out
what was different?

Cheers,
Chris

Re: [asio-users] asio in multithreaded server

[Jose <jm...@gm...>]

On 7/7/06, Christopher Kohlhoff <ch...@ko...> wrote:
>
> However, as Alex pointed out, I do need some examples that show
> how to create multithreaded servers. I'll have to think about
> what's a good protocol to use that's realistic, would actually
> benefit from threads, require the use of strands, but is still
> simple enough for an example. Suggestions?
>

Hi Chris,

I think HTTP is the protocol. You already have the single-threaded server
example and might want to add the two thread-based cases you describe above
(and even a thread-pool only example with no asio just for comparison)

For SMP and SoC architectures there is a pipelined architecture
that makes a difference (it relies on a 7 thread pool for each processor)
but
am not sure how this could be implemented with asio+threads

A Multi-Threaded PIPELINED Web Server Architecture for SMP/SoC machines
http://www2005.org/cdrom/docs/p730.pdf

As for a simple example that requires the use of strands you could do
something
as simple as a counter where each request increments it  (from any thread
that handled
the request) and returns the value in the response

regards

Re: [asio-users] how to do?

[Alex O. <ot...@je...>]

Hallo Christopher

I had run you code on my home computer, and it works fine. my code, that 
was broken, also run fine with in_avail function. Now i try to 
understand, why it throw exception on my work computer, may be i need to 
update my boost distro (home i had tried boost from cvs)

Christopher Kohlhoff wrote:
> Hi Alex,
>
> Alex Ott <ot...@je...> wrote:
>   
>> I use following code. osocket - server socket, sock - pointer
>> to client socket
>>
>> // write analyzed data from buffer
>>          boost::asio::write(*sock,responce);
>> // here is exception with description Success
>>          std::size_t rl=osocket.in_avail(boost::asio::assign_error(error));
>>       
>> // translate data between server and proxy
>> // here processing is hanging if all data already readed from server
>>             while(boost::asio::read(osocket, responce,
>> boost::asio::transfer_at_least(1),
>> boost::asio::assign_error(error))) {
>>                 boost::asio::write(*sock,responce);
>>             }
>>     
>
> I can't reproduce either of these problems with a simple test
> program (shown below). Do you have a complete program you can
> send that shows the problem? What platform are you running on?
>
> Cheers,
> Chris
>
> -----------------------
>
> #include <asio.hpp>
> #include <iostream>
>
> using asio::ip::tcp;
>
> int main()
> {
>   try
>   {
>     asio::io_service io_service;
>
>     tcp::endpoint listen_endpoint(tcp::v4(), 0);
>     tcp::acceptor acceptor(io_service, listen_endpoint);
>     std::cout << "Listening on " << acceptor.local_endpoint() << "\n";
>
>     tcp::socket client_socket(io_service);
>     acceptor.accept(client_socket);
>
>     tcp::endpoint remote_endpoint(asio::ip::address_v4::loopback(), 8085);
>     tcp::socket server_socket(io_service);
>     server_socket.connect(remote_endpoint);
>
>     asio::streambuf request;
>     std::ostream request_stream(&request);
>     request_stream << "GET / HTTP/1.0\r\n\r\n";
>     asio::write(server_socket, request);
>
>     asio::streambuf response;
>     asio::error error;
>     while (asio::read(server_socket, response,
>           asio::transfer_at_least(1), asio::assign_error(error)))
>     {
>       asio::write(client_socket, response);
>       std::size_t in_avail = server_socket.in_avail(asio::assign_error(error));
>       std::cout << "In avail = " << in_avail << "\n";
>       std::cout << "Error = " << error << "\n";
>     }
>
>     std::size_t in_avail = server_socket.in_avail(asio::assign_error(error));
>     std::cout << "In avail = " << in_avail << "\n";
>     std::cout << "Error = " << error << "\n";
>   }
>   catch (std::exception& e)
>   {
>     std::cout << "Exception: " << e.what() << "\n";
>   }
>
>   return 0;
> }
>
>
>
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> asio-users mailing list
> asi...@li...
> https://lists.sourceforge.net/lists/listinfo/asio-users
>   

-- 
With best wishes,      Alex Ott
Jet Infosystems,       Head of software development group, MBA
+7 (495) 411 76 01     http://www.jetsoft.ru/ 

Re: [asio-users] how to do?

[Alex O. <ot...@je...>]

Thanks for help, i tried to run example in monday, when i'll at work, 
and will have all needed infrastructure

Christopher Kohlhoff wrote:
> Hi Alex,
>
> Alex Ott <ot...@je...> wrote:
>   
>> I use following code. osocket - server socket, sock - pointer
>> to client socket
>>
>> // write analyzed data from buffer
>>          boost::asio::write(*sock,responce);
>> // here is exception with description Success
>>          std::size_t rl=osocket.in_avail(boost::asio::assign_error(error));
>>       
>> // translate data between server and proxy
>> // here processing is hanging if all data already readed from server
>>             while(boost::asio::read(osocket, responce,
>> boost::asio::transfer_at_least(1),
>> boost::asio::assign_error(error))) {
>>                 boost::asio::write(*sock,responce);
>>             }
>>     
>
> I can't reproduce either of these problems with a simple test
> program (shown below). Do you have a complete program you can
> send that shows the problem? What platform are you running on?
>
> Cheers,
> Chris
>
> -----------------------
>
> #include <asio.hpp>
> #include <iostream>
>
> using asio::ip::tcp;
>
> int main()
> {
>   try
>   {
>     asio::io_service io_service;
>
>     tcp::endpoint listen_endpoint(tcp::v4(), 0);
>     tcp::acceptor acceptor(io_service, listen_endpoint);
>     std::cout << "Listening on " << acceptor.local_endpoint() << "\n";
>
>     tcp::socket client_socket(io_service);
>     acceptor.accept(client_socket);
>
>     tcp::endpoint remote_endpoint(asio::ip::address_v4::loopback(), 8085);
>     tcp::socket server_socket(io_service);
>     server_socket.connect(remote_endpoint);
>
>     asio::streambuf request;
>     std::ostream request_stream(&request);
>     request_stream << "GET / HTTP/1.0\r\n\r\n";
>     asio::write(server_socket, request);
>
>     asio::streambuf response;
>     asio::error error;
>     while (asio::read(server_socket, response,
>           asio::transfer_at_least(1), asio::assign_error(error)))
>     {
>       asio::write(client_socket, response);
>       std::size_t in_avail = server_socket.in_avail(asio::assign_error(error));
>       std::cout << "In avail = " << in_avail << "\n";
>       std::cout << "Error = " << error << "\n";
>     }
>
>     std::size_t in_avail = server_socket.in_avail(asio::assign_error(error));
>     std::cout << "In avail = " << in_avail << "\n";
>     std::cout << "Error = " << error << "\n";
>   }
>   catch (std::exception& e)
>   {
>     std::cout << "Exception: " << e.what() << "\n";
>   }
>
>   return 0;
> }
>
>
>
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> asio-users mailing list
> asi...@li...
> https://lists.sourceforge.net/lists/listinfo/asio-users
>   

-- 
With best wishes,      Alex Ott
Jet Infosystems,       Head of software development group, MBA
+7 (495) 411 76 01     http://www.jetsoft.ru/ 

Re: [asio-users] how to do?

[Christopher K. <ch...@ko...>]

Hi Alex,

Alex Ott <ot...@je...> wrote:
> I use following code. osocket - server socket, sock - pointer
> to client socket
> 
> // write analyzed data from buffer
>          boost::asio::write(*sock,responce);
> // here is exception with description Success
>          std::size_t rl=osocket.in_avail(boost::asio::assign_error(error));
>       
> // translate data between server and proxy
> // here processing is hanging if all data already readed from server
>             while(boost::asio::read(osocket, responce,
> boost::asio::transfer_at_least(1),
> boost::asio::assign_error(error))) {
>                 boost::asio::write(*sock,responce);
>             }

I can't reproduce either of these problems with a simple test
program (shown below). Do you have a complete program you can
send that shows the problem? What platform are you running on?

Cheers,
Chris

-----------------------

#include <asio.hpp>
#include <iostream>

using asio::ip::tcp;

int main()
{
  try
  {
    asio::io_service io_service;

    tcp::endpoint listen_endpoint(tcp::v4(), 0);
    tcp::acceptor acceptor(io_service, listen_endpoint);
    std::cout << "Listening on " << acceptor.local_endpoint() << "\n";

    tcp::socket client_socket(io_service);
    acceptor.accept(client_socket);

    tcp::endpoint remote_endpoint(asio::ip::address_v4::loopback(), 8085);
    tcp::socket server_socket(io_service);
    server_socket.connect(remote_endpoint);

    asio::streambuf request;
    std::ostream request_stream(&request);
    request_stream << "GET / HTTP/1.0\r\n\r\n";
    asio::write(server_socket, request);

    asio::streambuf response;
    asio::error error;
    while (asio::read(server_socket, response,
          asio::transfer_at_least(1), asio::assign_error(error)))
    {
      asio::write(client_socket, response);
      std::size_t in_avail = server_socket.in_avail(asio::assign_error(error));
      std::cout << "In avail = " << in_avail << "\n";
      std::cout << "Error = " << error << "\n";
    }

    std::size_t in_avail = server_socket.in_avail(asio::assign_error(error));
    std::cout << "In avail = " << in_avail << "\n";
    std::cout << "Error = " << error << "\n";
  }
  catch (std::exception& e)
  {
    std::cout << "Exception: " << e.what() << "\n";
  }

  return 0;
}

Re: [asio-users] how to do?

[Alex O. <ot...@je...>]

boost::asio::streambuf - i had read data into it with read_until, before 
read. But exception is in in_avail, not in read

Christopher Kohlhoff wrote:
> Alex Ott <ot...@je...> wrote:
>
>   
>> // translate data between server and proxy
>> // here processing is hanging if all data already readed from server
>>             while(boost::asio::read(osocket, responce,
>> boost::asio::transfer_at_least(1),
>> boost::asio::assign_error(error))) {
>>                 boost::asio::write(*sock,responce);
>>             }
>>     
>
> What is the type of the variable called "responce"?
>
>
>
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> asio-users mailing list
> asi...@li...
> https://lists.sourceforge.net/lists/listinfo/asio-users
>   

-- 
With best wishes,      Alex Ott
Jet Infosystems,       Head of software development group, MBA
+7 (495) 411 76 01     http://www.jetsoft.ru/ 

Re: [asio-users] how to do?

[Christopher K. <ch...@ko...>]

Alex Ott <ot...@je...> wrote:

> // translate data between server and proxy
> // here processing is hanging if all data already readed from server
>             while(boost::asio::read(osocket, responce,
> boost::asio::transfer_at_least(1),
> boost::asio::assign_error(error))) {
>                 boost::asio::write(*sock,responce);
>             }

What is the type of the variable called "responce"?

Re: [asio-users] how to do?

[Alex O. <ot...@je...>]

Hello

Christopher Kohlhoff wrote:
> Alex Ott <ot...@je...> wrote:
>   
>> I playing with asio and writing proxy. sometimes i don't know
>> how many bytes will send from server to client, and wait for
>> it in read-write loop. But sometimes, i already had readed
>> data into the buffer, and my work stop until the timeout,
>> waiting for data.
>>     
>
> Presumably you are doing something like:
>
>   asio::read(sock, asio::buffer(buf));
>
> This usage of asio::read (or the equivalent asio::async_read
> call) does not finish until the buffer is full or an error
> occurs.
>
>   
See example of code at the end of mail
>> I had tried to use in_avail function, but it always throw
>> exception, instead of assigning error value to variable. Why
>> it do this?
>>     
>
> I don't know why it would fail at all: what is the error code
> contained inside the exception object? How are you trying to use
> it?
>
>   
Success
>> And may be somebody give me a answer, what the best strategy
>> to process data of unknown sizes?
>>     
>
> Either:
>
>   - Use sock.read_some() (or equivalent sock.async_read_some()
>     function), which will complete after one or more bytes as
>     been read.
>
>     or ...
>
>   - Use the following form of asio::read():
>
>     size_t bytes_read = asio::read(
>         sock, asio::buffer(buf),
>         asio::transfer_at_least(1));
>
>     or ...
>
>   - If the data is terminated by some sort of delimiter, use
>     asio::read_until().
>
>   
I use following code. osocket - server socket, sock - pointer to client 
socket

// write analyzed data from buffer
         boost::asio::write(*sock,responce);
// here is exception with description Success
         std::size_t rl=osocket.in_avail(boost::asio::assign_error(error));
       
// translate data between server and proxy
// here processing is hanging if all data already readed from server
            while(boost::asio::read(osocket, responce,
                                                            
boost::asio::transfer_at_least(1),
                                                            
boost::asio::assign_error(error))) {
                boost::asio::write(*sock,responce);
            }



-- 
With best wishes,      Alex Ott
Jet Infosystems,       Head of software development group, MBA
+7 (495) 411 76 01     http://www.jetsoft.ru/ 

Re: [asio-users] how to do?

[Christopher K. <ch...@ko...>]

Alex Ott <ot...@je...> wrote:
> I playing with asio and writing proxy. sometimes i don't know
> how many bytes will send from server to client, and wait for
> it in read-write loop. But sometimes, i already had readed
> data into the buffer, and my work stop until the timeout,
> waiting for data.

Presumably you are doing something like:

  asio::read(sock, asio::buffer(buf));

This usage of asio::read (or the equivalent asio::async_read
call) does not finish until the buffer is full or an error
occurs.

> I had tried to use in_avail function, but it always throw
> exception, instead of assigning error value to variable. Why
> it do this?

I don't know why it would fail at all: what is the error code
contained inside the exception object? How are you trying to use
it?

> And may be somebody give me a answer, what the best strategy
> to process data of unknown sizes?

Either:

  - Use sock.read_some() (or equivalent sock.async_read_some()
    function), which will complete after one or more bytes as
    been read.

    or ...

  - Use the following form of asio::read():

    size_t bytes_read = asio::read(
        sock, asio::buffer(buf),
        asio::transfer_at_least(1));

    or ...

  - If the data is terminated by some sort of delimiter, use
    asio::read_until().

Cheers,
Chris

Re: [asio-users] docs about buffers usage?

[Alex O. <ot...@je...>]

Hello

Christopher Kohlhoff wrote:
> Alex Ott <ot...@je...> wrote:
>   
>> as i remember - in previous versions of tutorial was good part
>> about what is asio buffers, what types exists, etc. may be
>> restore this part in docs?
>>     
>
> I don't remember removing any docs to do with buffers. Could
> this be the page you're thinking of?:
>
>   <http://asio.sourceforge.net/boost_asio_0_3_7/libs/asio/doc/reference/a00268.html>
>
>   
Good. But may be include this intro to the tutorial?
-- 
With best wishes,      Alex Ott
Jet Infosystems,       Head of software development group, MBA
+7 (495) 411 76 01     http://www.jetsoft.ru/ 

Re: [asio-users] docs about buffers usage?

[Christopher K. <ch...@ko...>]

Hi Alex,

Alex Ott <ot...@je...> wrote:
> as i remember - in previous versions of tutorial was good part
> about what is asio buffers, what types exists, etc. may be
> restore this part in docs?

I don't remember removing any docs to do with buffers. Could
this be the page you're thinking of?:

  <http://asio.sourceforge.net/boost_asio_0_3_7/libs/asio/doc/reference/a00268.html>

> Now i working on the http proxy example - i have sync version,
> and plan to write async one. I think, that it would be good
> example, as it shows usage of different functions in one
> example

Great, looking forward to seeing it! 

Cheers,
Chris

[asio-users] how to do?

[Alex O. <ot...@je...>]

I playing with asio and writing proxy. sometimes i don't know how many 
bytes will send from server to client, and wait for it in read-write 
loop. But sometimes, i already had readed data into the buffer, and my 
work stop until the timeout, waiting for data.
I had tried to use in_avail function, but it always throw exception, 
instead of assigning error value to variable. Why it do this?

And may be somebody give me a answer, what the best strategy to process 
data of unknown sizes?

-- 
With best wishes,      Alex Ott
Jet Infosystems,       Head of software development group, MBA
+7 (495) 411 76 01     http://www.jetsoft.ru/ 

[asio-users] docs about buffers usage?

[Alex O. <ot...@je...>]

Hi all

as i remember - in previous versions of tutorial was good part about 
what is asio buffers, what types exists, etc. may be restore this part 
in docs?

Now i working on the http proxy example - i have sync version, and plan 
to write async one. I think, that it would be good example, as it shows 
usage of different functions in one example

-- 
With best wishes,      Alex Ott
Jet Infosystems,       Head of software development group, MBA
+7 (495) 411 76 01     http://www.jetsoft.ru/ 

Re: [asio-users] asio in multithreaded server

[Christopher K. <ch...@ko...>]

Jose <jm...@gm...> wrote:
> Do you plan to provide the performance examples in the boost
> distribution (using boost.threads) ?

Probably not in their current form. I intend to develop a new
set of benchmark programs that automatically execute a range of
different tests (throughput, latency, connections-per-second,
etc) while varying different parameters (number of live and dead
connections, message size, number of threads, etc). These
programs will automatically generate raw data suitable for
plugging into something like Excel to create graphs and so on.

However, as Alex pointed out, I do need some examples that show
how to create multithreaded servers. I'll have to think about
what's a good protocol to use that's realistic, would actually
benefit from threads, require the use of strands, but is still
simple enough for an example. Suggestions?

Cheers,
Chris

Re: [asio-users] basic_streambuf.hpp - error duplicated code

[Christopher K. <ch...@ko...>]

Jose <jm...@gm...> wrote:
> It looks like basic_streambuf.hpp has all the code duplicated.

Fixed, thanks! Looks like I got a bit too enthusiastic with a
copy-and-paste. At least since it duplicated the include guard
as well it should have been harmless.

Cheers,
Chris

Re: [asio-users] asio in multithreaded server

[Jose <jm...@gm...>]

On 7/6/06, Christopher Kohlhoff <ch...@ko...> wrote:
>
> See the performance test programs
>    included in the non-boost distribution for an example showing
>    multithreaded client and server programs that use strands:
>
>    <http://asio.cvs.sourceforge.net/asio/asio/src/tests/performance/>


Hi Chris,

Do you plan to provide the performance examples in the boost distribution
(using boost.threads) ?

regards

[asio-users] basic_streambuf.hpp - error duplicated code

[Jose <jm...@gm...>]

It looks like basic_streambuf.hpp has all the code duplicated.

regards

Re: [asio-users] error in include/asio/detail/reactive_socket_service.hpp

[Christopher K. <ch...@ko...>]

Alex Ott <ot...@je...> wrote:
> include/asio/detail/reactive_socket_service.hpp:77: error: comma at end 
> of enumerator list

I just committed the fix to asio's CVS repository. Thanks!

Re: [asio-users] asio in multithreaded server

[Christopher K. <ch...@ko...>]

Hi Alex,

Alex Ott <ot...@je...> wrote:
> I look to asio and it seems very good. but documentation
> covers to few examples/topics. I understand how to implement
> single threaded async servers. But has anybody example of
> multithreaded servers? I want to write this one, that will run
> on multikernel CPU's.

There are probably two main approaches to using asio's
asynchronous operations in multithreaded servers:

1) Run a pool of threads against a single io_service object.

   You can do this by calling io_service::run() from multiple
   threads. Since your handlers can now be called from different
   threads, you might also want to protect access to shared data
   using a strand object.

   See the tutorial program Timer.5 for a very simple example
   showing how to use strands. See the performance test programs
   included in the non-boost distribution for an example showing
   multithreaded client and server programs that use strands:

   <http://asio.cvs.sourceforge.net/asio/asio/src/tests/performance/>

2) Use a pool of io_service objects, with one thread per
   io_service object.

   As an example you might have one io_service object per CPU.
   This approach removes the need for synchronisation using
   strand objects, since it's really like having multiple single
   threaded servers. When objects associated with different
   io_service objects need to communicate they should use
   io_service::post() to send messages.

The first approach should spread the load more evenly across
multiple CPUs when the system is heavily loaded. However the
second approach keeps the work associated with each io_service
object independent, as well as eliminating the synchronisation
cost of strand objects, and so is likely to better scale to
utilise many CPUs.

Cheers,
Chris

Re: [asio-users] Async filesystem IO

[Christopher K. <ch...@ko...>]

Hi David,

David J. Fiddes <D....@fi...> wrote:
> Are there any plans to add file system support to asio? It
> seems that there is a lot of common infrastructure in asio
> that would be really useful for both network and file IO.

Felipe Magno de Almeida <fel...@gm...> has been
working on some async file I/O support for asio. You might want
to get in touch and see where it's up to. Hopefully it will be
added into a future version of asio -- probably after whatever is
included in boost 1.35, however.

Cheers,
Chris

[asio-users] error in include/asio/detail/reactive_socket_service.hpp

[Alex O. <ot...@je...>]

include/asio/detail/reactive_socket_service.hpp:77: error: comma at end 
of enumerator list

-- 
With best wishes,      Alex Ott
Jet Infosystems,       Head of software development group, MBA
+7 (495) 411 76 01     http://www.jetsoft.ru/ 

[asio-users] asio in multithreaded server

[Alex O. <ot...@je...>]

Hi all

I look to asio and it seems very good. but documentation covers to few 
examples/topics. I understand how to implement single threaded async 
servers. But has anybody example of multithreaded servers? I want to 
write this one, that will run on multikernel CPU's.

-- 
With best wishes,      Alex Ott
Jet Infosystems,       Head of software development group, MBA
+7 (495) 411 76 01     http://www.jetsoft.ru/