On 2008-Aug-10, at 11:31, Elf wrote:
[3]> (car 'foo)
*** - CAR: FOO is not a list
in clisp's implementation. car and cdr did work, though. the NIL
is way,
way too overloaded in CL.
I know I said I'd shut up on this topic, but... :-)
On the first Lisp system I used for real programming (Lisp/MTS, a sort
of perverted version of Lisp 1.5, running on the MTS
operating system circa 1971), (cdr 'symbol) gave you the property list
of a symbol. I had done some trivial programs with
PDP-8 Lisp a year or so before, and, as I recall, (car 'symbol) gave
you the print name (as some datatype that wasn't very
useful) and (cdr 'symbol) again gave the property list. (I believe the
plist as cdr of a symbol was official Lisp 1.5 behavior.)
The problem with appealing to prior practice in Lisp systems is that
there's so much of it, and so much of it that is
contradictory.
On the subject of threads, I would be quite comfortable with a strong
warning about the perils of thread-terminate!. I have
designed a fair amount of thread-based code over the years, and taught
concurrency in industrial settings. I have never
found a problem that *required* unscheduled thread termination.
Normally I design threads either to terminate when they
receive a special marker in their input queue, or to poll for a
termination request.
-- v
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