Re: [boost] [asio] Pass some parameter to io_service::run

Subject: Re: [boost] [asio] Pass some parameter to io_service::run
From: Dmytro Ovdiienko (dmitriy.ovdienko_at_[hidden])
Date: 2010-01-10 02:51:29

Hello Sergey,

Thank you for your participation.

In this case I should create LargeObject for every socket because I don't
know what thread of the pool will process incoming message. And I cannot
pass the same largeObject to two or more recv operations.

Looks like I should use null_buffers. What is overhead of this way? Should I
go to the kernel twise (1st - socket::async_recv, 2nd - socket::recv)?

The best way for me is, if asio will repeat the Windows Async I/O interface
and let me call completion routine directly.

2010/1/10 Sergei Politov <spolitov_at_[hidden]>

> Hi,
>
> >
> > I need to pass reference to this object to the socket::async_receive
> > complete routine to complete message processing. This object allocates a
> > lot
> > of memory and I cannot create it for every socket. It is possible to
> create
> > but there is no sense.
> >
>
>   You can pass them using boost::bind:
>   socket_.async_read_some(boost::asio::buffer(data_, max_length),
>        boost::bind(&session::handle_read, this,
>          boost::asio::placeholders::error,
>          boost::asio::placeholders::bytes_transferred,
>          boost::ref(largeObject)));
>
>  Where:
>  void session::handle_read(const boost::system::error_code& error, size_t
> bytes_transferred, LargeObject & largeObject)
>  {
>     ......
>  }
>
> Best Regards,
>  Sergei
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