From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Andreas Schwab Newsgroups: gmane.emacs.devel Subject: Re: busyloop in sigchld_handler Date: Mon, 12 Mar 2007 18:37:55 +0100 Message-ID: References: NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: sea.gmane.org 1173721102 27662 80.91.229.12 (12 Mar 2007 17:38:22 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Mon, 12 Mar 2007 17:38:22 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Mar 12 18:38:15 2007 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1HQoTN-00066R-Di for ged-emacs-devel@m.gmane.org; Mon, 12 Mar 2007 18:38:13 +0100 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1HQoU3-0003Mg-Eh for ged-emacs-devel@m.gmane.org; Mon, 12 Mar 2007 12:38:55 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1HQoTs-0003Ma-Pw for emacs-devel@gnu.org; Mon, 12 Mar 2007 13:38:44 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1HQoTq-0003MO-JN for emacs-devel@gnu.org; Mon, 12 Mar 2007 13:38:44 -0400 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1HQoTq-0003ML-Fk for emacs-devel@gnu.org; Mon, 12 Mar 2007 12:38:42 -0500 Original-Received: from ns.suse.de ([195.135.220.2] helo=mx1.suse.de) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1HQoT9-0003MK-NC for emacs-devel@gnu.org; Mon, 12 Mar 2007 13:37:59 -0400 Original-Received: from Relay2.suse.de (mail2.suse.de [195.135.221.8]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.suse.de (Postfix) with ESMTP id 64FEA12207 for ; Mon, 12 Mar 2007 18:37:57 +0100 (CET) X-Yow: I own seven-eighths of all the artists in downtown Burbank! In-Reply-To: (Sam Steingold's message of "Sun, 11 Mar 2007 17:06:07 -0400") User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.0.91 (gnu/linux) X-detected-kernel: Linux 2.4-2.6 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:67801 Archived-At: Sam Steingold writes: > wait3 is a system call, which, when invoked in a loop, prevents the > kernel from doing anything else (in this case, sending SIGCHLD to > emacs). sleep allows the kernel some time to pass the signal. I don't find this explanation convincing at all. Since the system call i= s made _inside_ the signal handler, the signal is actually blocked here, so it cannot be delivered anyway. Andreas. --=20 Andreas Schwab, SuSE Labs, schwab@suse.de SuSE Linux Products GmbH, Maxfeldstra=DFe 5, 90409 N=FCrnberg, Germany PGP key fingerprint =3D 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED= 5 "And now for something completely different."