Excerpts from Bardur Arantsson's message of Tue Feb 16 23:48:14 +0200 2010: > > This cannot be fixed in the sendfile library, it is a > > feature of TCP that connections may linger for a long > > time unless explicit timeouts are used. > > The problem is that the sendfile library *doesn't* wake > up when the connection is terminated (because of threadWaitWrite) > -- it doesn't matter what the timeout is.
Even server code without sendfile has the same issue since all writing to sockets ends up using threadWaitWrite. System.Timeout.timeout terminates a threadWaitWrite using asynchronous exceptions. If you want to detect dead sockets somewhat reliably without a timeout then there is SO_KEEPALIVE combined with polling SO_ERROR every few minutes. - Taru Karttunen _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
