Re: Determining whether a TCP connection is up

[Lars Magne Ingebrigtsen <larsi@gnus.org>]

Julien Danjou <julien@danjou.info> writes:

> I think most IMAP clients uses a pool of several connections in the
> background to deliver actions based on some sort of queue, like delete
> something or fetch this. Having this would solve partially the problem
> since if a connection goes AWOL, you just have to wait for the kernel to
> kill the TCP connection it at some point (which might takes time), but
> you can continue to create new (working) connections to fulfil the user
> requests in the meantime, and then requeue the action that timed-out.

Whether you have a pool of connections or kill/reconnect, the problem
remains the same: Figuring out when to switch connections/reconnect.

And in the case that the IP address changed, all your connections in the
pool will hang, so it doesn't really help...

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