[drakma-devel] [usocket-devel] [patch] Resubmit drakma timeout for sbcl.

[Nikodemus Siivola]

2011/3/27 Chun Tian (binghe) <binghe.lisp at gmail.com>:

> Well, I think the TIMEOUT keyword arguments on SOCKET-CONNECT currently has following meanings:
>
> 1. When doing TCP work, it means a "connection timeout";
> 2. When doing UCP work, it sets the default "read timeout" (because "connection timeout" is meaningless for UDP);

For SBCL backend at least this is not correct.

There :TIMEOUT is a read timeout for any single blocking read from the
socket. Connections and writes are unaffected -- though SBCL changes
may apply the timeouts to writes as well.

Waiting for a connection is not affected -- but adding support for
that is pretty easy.

Sidenote: I haven't really looked at usocket's SBCL backend beyond
SOCKET-CONNECT prior to this, but a quick peek shows that it's pretty
cavalier about using SBCL internals. This is not good. Internals
_will_ change, and then usocket will break. Specifically, SB-UNIX
package is an internal implementation package -- using it is bad.
SB-POSIX is the supported POSIX api. Some SB-FOO::BAR stuff in there
as well. :/

Cheers,

 -- Nikodemus