Re: [Boost-users] [boost::asio]Question about how to properly make several async requests (reads and writes)

Subject: Re: [Boost-users] [boost::asio]Question about how to properly make several async requests (reads and writes)
From: Matheus Araújo Aguiar (matheus.pit_at_[hidden])
Date: 2009-09-04 11:00:58

Thanx Robert, although in the link you send me i could not find the follow
up, googling the mail subject easily returned me the complete mail exchange
(two e-mails from the same guy). In those, he finds out that the callbacks
might be called in an order different from the order of the requests made,
hence data could get merged.

However, i feel that doesn't answer the question about the writes, since
callbacks are called after the bytes are sent, so this 'out-of-order
callback calls' will not have impact on the data sent. Or am i mistaken, and
actually the async writes could be executed out of order and/or at the same
time?

Thanks again and best wishes,

On Fri, Sep 4, 2009 at 10:36 AM, Robert Jones <robertgbjones_at_[hidden]>wrote:

> 2009/9/4 Matheus Araújo Aguiar <matheus.pit_at_[hidden]>
>
> Dear list,
>>
>> I have learned that one cannot make several async write requests, one
>> after another, without waiting for the completion of each request, otherwise
>> the bytes get merged and the messages will not make sense at the receiving
>> side. I am correct assuming that, right?
>> My doubt is if the same happens to async read requests. Does one have to
>> wait a read request completes before issuing another? Will the bytes get
>> merged too, if one does not wait before making another read request?
>>
>> Assuming things happen that way, one async request waiting for the
>> completion of another earlier request, then one have serial I/O processing
>> and if one wants to have things done in parallel, the simplest way would be
>> having other(s) thread(s) reading and writting in the same I/O object. Is
>> this correct?
>>
>> I hope I have made my doubts clear enough, and if it is not clear please
>> say it and i will try to be more objective.
>>
>>
> See http://article.gmane.org/gmane.comp.lib.boost.user/50424
>
> Regards.
>
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-- 
Matheus Araújo Aguiar
Computer Scientist
matheus.pit_at_[hidden]