unofficial mirror of bug-guile@gnu.org 
 help / color / mirror / Atom feed
From: Marius Vollmer <mvo@zagadka.ping.de>
Cc: bug-guile@gnu.org
Subject: Re: no output from ice-9 `format' after `make-thread'
Date: 03 Nov 2002 01:00:51 +0100	[thread overview]
Message-ID: <87znsrcyj0.fsf@zagadka.ping.de> (raw)
In-Reply-To: <87d6pn1stf.fsf@blarg.net>

Eric Hanchrow <offby1@blarg.net> writes:

> Invoke the snippet with `guile -s snippet.scm'.  Note the total lack
> of output.

The process exits before it can produce any output.  "guile -s" exits
as soon as the main thread exits.  (The builtin simple-format is
probably fast enough to produce output anyway.)

Try this:

    (use-modules (ice-9 threads))
    (use-modules (ice-9 format))

    (define safe-format
      (let ((m (make-mutex)))
        (lambda args
          (with-mutex m
            (apply format args)))))

    (let ((ts (map (lambda (sym)
                     (make-thread
                      (lambda ()
                        (sleep (random 4))
                        (safe-format #t "Hey you: ~A~%" sym))))
                   (list 'bob 'sam 'huey 'luey 'duey))))
      (for-each join-thread ts))

It uses join-thread to wait for the threads to finish.

Note also that (ice-9 format) is not thread safe... (which I'm going
to fix soonish (when nothing preempts me)).

-- 
GPG: D5D4E405 - 2F9B BCCC 8527 692A 04E3  331E FAF8 226A D5D4 E405


_______________________________________________
Bug-guile mailing list
Bug-guile@gnu.org
http://mail.gnu.org/mailman/listinfo/bug-guile


  reply	other threads:[~2002-11-03  0:00 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-11-02 22:59 no output from ice-9 `format' after `make-thread' Eric Hanchrow
2002-11-03  0:00 ` Marius Vollmer [this message]
2002-11-04 18:52   ` Neil Jerram
2002-11-17 15:00     ` Marius Vollmer

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://www.gnu.org/software/guile/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=87znsrcyj0.fsf@zagadka.ping.de \
    --to=mvo@zagadka.ping.de \
    --cc=bug-guile@gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).