From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: ludo@gnu.org (Ludovic =?iso-8859-1?Q?Court=E8s?=) Newsgroups: gmane.lisp.guile.devel Subject: Back to the future! Date: Fri, 03 Dec 2010 00:55:40 +0100 Message-ID: <87pqtj6877.fsf@gnu.org> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: dough.gmane.org 1291334171 23180 80.91.229.12 (2 Dec 2010 23:56:11 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Thu, 2 Dec 2010 23:56:11 +0000 (UTC) To: guile-devel@gnu.org Original-X-From: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Fri Dec 03 00:56:07 2010 Return-path: Envelope-to: guile-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1POJ0O-0001I6-ME for guile-devel@m.gmane.org; Fri, 03 Dec 2010 00:56:04 +0100 Original-Received: from localhost ([127.0.0.1]:54071 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1POJ0O-0006N7-84 for guile-devel@m.gmane.org; Thu, 02 Dec 2010 18:56:04 -0500 Original-Received: from [140.186.70.92] (port=34542 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1POJ0L-0006Ms-Gu for guile-devel@gnu.org; Thu, 02 Dec 2010 18:56:02 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1POJ0K-0000Rg-Ko for guile-devel@gnu.org; Thu, 02 Dec 2010 18:56:01 -0500 Original-Received: from lo.gmane.org ([80.91.229.12]:55490) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1POJ0K-0000R0-FH for guile-devel@gnu.org; Thu, 02 Dec 2010 18:56:00 -0500 Original-Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1POJ0H-0001FC-8U for guile-devel@gnu.org; Fri, 03 Dec 2010 00:55:57 +0100 Original-Received: from yoda.fdn.fr ([80.67.169.18]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 03 Dec 2010 00:55:57 +0100 Original-Received: from ludo by yoda.fdn.fr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 03 Dec 2010 00:55:57 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 22 Original-X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: yoda.fdn.fr X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 13 Frimaire an 219 de la =?iso-8859-1?Q?R=E9volution?= X-PGP-Key-ID: 0xEA52ECF4 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 83C4 F8E5 10A3 3B4C 5BEA D15D 77DD 95E2 EA52 ECF4 X-OS: x86_64-unknown-linux-gnu User-Agent: Gnus/5.110011 (No Gnus v0.11) Emacs/23.2 (gnu/linux) Cancel-Lock: sha1:EVsuRbVJZDv2lE3IQL7Rn7aH2QQ= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-BeenThere: guile-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Developers list for Guile, the GNU extensibility library" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Errors-To: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.devel:11231 Archived-At: Hello! There’s a brand new (ice-9 futures) module implementing futures: http://git.sv.gnu.org/cgit/guile.git/commit/?id=0d4e6ca38f1c51f5f92effc7d97c8b69eb85d071 (There used to be an implementation of futures in libguile, but it was never included in a release because of various bugs.) It basically does the job, though there are a couple of minor FIXMEs or TODOs. The implementation was inspired by that of libgomp, the GNU OpenMP run-time support library. It uses a pool of threads, normally one per CPU core minus one, and offloads expression evaluation to them. On a single-core machine, you get an empty thread pool, meaning that futures are evaluated sequentially, upon ‘touch’. Feedback welcome! :-) Thanks, Ludo’.