Re: [Boost-users] How to design proper release of a boost::asio socket or wrapper thereof

Subject: Re: [Boost-users] How to design proper release of a boost::asio socket or wrapper thereof
From: Christopher Pisz (christopherpisz_at_[hidden])
Date: 2017-04-06 03:50:17

Genious. Thank you sir.

On Wed, Apr 5, 2017 at 10:02 PM, Gavin Lambert via Boost-users <
boost-users_at_[hidden]> wrote:

> On 6/04/2017 10:14, Christopher Pisz via Boost-users wrote:
>
>> What if the server wants to send "Hello" to all clients every 5 minutes?
>> You need a collection. If you have a collection, then you maintain a
>> reference count when using shared_ptrs, and just killed the tutorials
>> lifetime management scheme. In the end, you need to know when it is safe
>> to
>> remove the connection from a collection and destroy it.
>>
>
> Make a collection of weak_ptrs.  When you go through and try to send to
> them, some of them will have expired, and you can remove them from the
> collection then.  The rest are still alive (although some might error out
> when you try to send to them, due to the way TCP works; if that happens you
> can just close() them and they'll be expired the next time you check).
>
> If you want to explicitly disconnect a given connection, you simply need
> to call shutdown() and close() on it (via a method on your connection
> class), which will abort the pending receive and release the internal
> references, so once you discard the local shared_ptr you just used to close
> it then the connection object will be destroyed automatically.
>
> (Note that it's not safe to assume you can destroy the object immediately
> after calling close() on the socket -- if the receive was still pending, it
> still needs to call the completion handler with the error, which might
> happen later on a different thread.  This is why using shared_ptr is the
> preferred solution as it handles different lifetime ordering correctly
> without explicit locking.)
>
>
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