Re: [boost] [asio] Tutorial 7 using strdup, new

From: Stefan Seefeld (seefeld_at_[hidden])
Date: 2006-02-07 07:42:12

Giovanni P. Deretta wrote:

>>If the system has data ready to be read for that device, which reference
>>should it dispatch them to ?
>>
> 
> Well the system does not dispatch readiness messages to handles, but you 
> register an handle with a callback to receive notification.
> If you register multiple handles, all of them get the notification.

That doesn't make much sense to me. Assuming an underlaying 'select()',
I register file descriptors, not handlers, with a callback.

And even if that callback would itself call multiple functions, how
much sense does it make to let them all read from the device ? They
would all need to coordinate so they see all the data they need.

> Anyway, even if you have multiple copies of an handle, you should'n use 
> more than one at once expecially from multiple threads and expecially 
> stream handles (actually using the same datagram socket or accept socket 
> from multiple threads should be fine)

Exactly. My point was really that I think making streams non-copyable
would prevent such design errors, or at least, would make them harder
to do. :-)

Regards,
                Stefan