Re: [asio-users] Concurent async_read and async_write

[Roger A. <Ro...@wa...>]

Take a look at the chat server and client in the asio examples.

Note the use of a queue for async_writes. This is because it is not safe
to issue async_write before the previous async_write has completed (the
data could get interleaved if async_write needs more than one call to
async_write_some to push the data on to the tcp stack). Presumably the
same is true of async_read, but the typical design is to allow each
async_read to complete and be handled before issuing the next (achieved
by issuing the next read from the read handler itself) so the problem
does not arise.


-----Original Message-----
From: asi...@li...
[mailto:asi...@li...] On Behalf Of KRUCHIO
Gabor
Sent: Saturday, 19 January 2008 8:47 AM
To: 'asi...@li...'
Subject: [asio-users] Concurent async_read and async_write

Hi,

I am facig to the following problem:=20

- server process waits for a client to connect on socket_A;
- client_A connects on socket_A to server;
- after establishing tcp connection successfully, both client_A and the
server
  can send concurently messages to the opposite side,


After studying asio examples and changing serialisation example code, my
client - server is able to play request-response scenario, i.e.:
- after receiving a request server sends back a response to client_A (
i.e.
in server: async_write() after async read() ) or
- after accepting connection server sends a request to client_A and
client_A
responds to the server ( i.e. in server async_read() after async_write()
).


Please give me some guides or pointers how to send messages thru tcp
using
asio from server to client_A while concurently server waits for messages
from clientA on the *same* socket.

Regards:

Gabor

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