[Openmcl-devel] Problems with RUN-PROGRAM
marcoxa at cs.nyu.edu
Tue Nov 19 10:18:11 EST 2002
> Date: Mon, 18 Nov 2002 18:39:04 -0700 (MST)
> From: Gary Byers <gb at clozure.com>
> cc: <openmcl-devel at clozure.com>
> X-UIDL: +68!!H!m"!p(d"!MMJ!!
> On Mon, 18 Nov 2002, Marco Antoniotti wrote:
> > Hi
> > OS X 10.2 Jaguar.
> > ? (run-program "ls" ())
> > #<EXTERNAL-PROCESS  (EXITED : 0) #x5398B7E>
> > ? (run-program "ls" () :output *standard-output*)
> Somewhat questionably, RUN-PROGRAM's OUTPUT keyword arg defaults to
> NIL, which causes any output from the EXTERNAL-PROCESS to be discarded;
> it's necessary to say something like:
> ? (run-program "ls" () :output t)
> to get "ls"'s output sent to the listener. ":OUTPUT T" would probably
> be a more reasonable default; I believe that it's at least behaving
> as documented.
I confirm that ` :output T ' works as expected (i.e. it does).
> > ... hangs or displays funky error message (like "Unbound Variable
> > \<?>").
> > Any clues about why this would be failing?
> There's a usually-dormant lisp thread that's supposed to wake up
> whenever an EXTERNAL-PROCESS is created and is supposed to stay
> awake as long as some EXTERNAL-PROCESS has pending I/O or unresolved
> exit status.
> There was a bug in 0.13 whereby that lisp thread went back to sleep
> too early; that could explain hanging and other funkiness. That
> was supposed to have been fixed in 0.13.1, and I can't reproduce the
> bug with that fix in place.
> If you're running 0.13.1 and still see this, I'm puzzled. If you
> can get to a break loop when it's hung, are either of the variables
> CCL::*EXTERNAL-PROCESSES* or CCL::*WATCHED-FD-HANDLERS* non-NIL ?
> (The "watchdog" thread is supposed to stay awake if so.)
I am running 0.13. The call is
(run-process "ls" () :output *standard-output*)
it hangs, I hit C-c and get to the break loop.
CCL::*EXTERNAL-PROCESSES* is NIL and CCL::*WATCHED-FD-HANDLERS* is
I'll upgrade to the latest version.
Marco Antoniotti ========================================================
NYU Courant Bioinformatics Group tel. +1 - 212 - 998 3488
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