Scieneer Common Lisp 1.3.9 online documentation

http:server-maximum-connections server[Function]

The HTTP server maximum number of open connections, which includes both active connections and idle persistent connections. The server manages persistent connections, closing them in least recently used order when necessary to allow new connections to be accepted. If the limit is reached and there are no idle connections remaining to close then new connections are closed immediately without processing.

(setf (http:server-maximum-connections server) connections)[Function]

Set the maximum number of open connections for the servers. The system limits on the number of socket descriptors is checked and when necessary an attempt is made to increase the system limit, otherwise the maximum number of connections is reduced to within the system limits.