All,

I'm experimenting moving over a body of code from LispWorks to SBCL and I've got some multithreaded code. When using LW, I'd just start up a LW core image on a command line, manually start up swank, then do slime-connect a couple of times, and use the 2 repls to experiment / debug the multithreaded code. Specifically, I've got a shared queue that waits when empty; I'd call the dequeue in repl 1, see that it properly waits, then enqueue in repl 2 and ideally see the enqueue return in repl 1; crude, but simple.

I try doing the same thing in SBCL. I start up SBCL in a shell, start up swank, and I can start up the 1st repl with slime-connect. When I attempt a 2nd slime-connect, emacs loses the connection to SBCL and I get this in the shell running SBCL:

WRITE: (:return (:ok (:pid 6102 :style :spawn :lisp-implementation (:type "SBCL" :name "sbcl" :version "0.9.8") :machine (:instance "localhost.localdomain" :type "X86" :version "Intel(R) Pentium(R) 4 CPU 2.80GHz") :features (:acl-compat :cl-ppcre it.bese.arnesi.mopp::have-mop :split-sequence :asdf :sb-thread :ansi-cl :common-lisp :sbcl :unix :sb-doc :sb-test :sb-package-locks :sb-unicode :sb-source-locations :ieee-floating-point :x86 :elf :linux :gencgc :stack-grows-downward-not-upward :c-stack-is-control-stack :stack-allocatable-closures :linkage-table :os-provides-dlopen :os-provides-dladdr :os-provides-putwc) :package (:name "COMMON-LISP-USER" :prompt "CL-USER"))) 1) WRITE: (:open-dedicated-output-stream 32783) READ: "(:emacs-rex (swank:connection-info) "COMMON-LISP-USER" :repl-thread 1) " DISPATCHING: (:EMACS-REX (SWANK:CONNECTION-INFO) "COMMON-LISP-USER" :REPL-THREAD 1) ;; Event history end. ;; Connection to Emacs lost. [ ;; condition: The value NIL is not of type SB-THREAD:THREAD. ;; type: TYPE-ERROR ;; encoding: :ISO-LATIN-1-UNIX style: :SPAWN dedicated: T]

<sbcl is locked, so I hit control-c and get this:>

debugger invoked on a SIMPLE-CONDITION in thread #<THREAD "initial thread" {A66D379}>: interrupted at #XB7FFF402

Type HELP for debugger help, or (SB-EXT:QUIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name): 0: [CONTINUE] Return from SB-UNIX:SIGINT. 1: [ABORT ] Exit debugger, returning to top level.

(SB-UNIX::SIGINT-HANDLER #<unavailable argument> #<unavailable argument> #.(SB-SYS:INT-SAP #XB7B9C5FC)) 0]

I'm running SBCL 0.9.8, slime from cvs of 12/27/2005, and Fedora Core 4. I've got a function for starting up swank:

(defun start-swank (&key (port swank::default-server-port) (style swank:*communication-style*) (dont-close t)) "Start the SLIME swank server, listening on PORT. Multiple connections are allowed." (swank:create-server :port port :style style :dont-close dont-close))

and I call it with default arguments, (start-swank).

Is it possible to drive SBCL like I mentioned at the top with LispWorks and if so, how do I do it?

Thanks!

Glenn Ehrlich