From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#38632: 27.0.50; Emacs process name is changed permanently upon creating a named thread Date: Wed, 18 Dec 2019 17:53:49 +0200 Message-ID: <83v9qd3a0i.fsf@gnu.org> References: <87bls8ojoh.fsf@yantar92-laptop.i-did-not-set--mail-host-address--so-tickle-me> <83y2va3efz.fsf@gnu.org> Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="88740"; mail-complaints-to="usenet@blaine.gmane.org" Cc: 38632@debbugs.gnu.org, yantar92@gmail.com To: Robert Pluim Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Dec 18 16:55:12 2019 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1ihbfK-000Mvn-7e for geb-bug-gnu-emacs@m.gmane.org; Wed, 18 Dec 2019 16:55:10 +0100 Original-Received: from localhost ([::1]:55920 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ihbfJ-0001Oe-2z for geb-bug-gnu-emacs@m.gmane.org; Wed, 18 Dec 2019 10:55:09 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:53593) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ihbfD-0001OM-8S for bug-gnu-emacs@gnu.org; Wed, 18 Dec 2019 10:55:04 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ihbfC-00019m-7v for bug-gnu-emacs@gnu.org; Wed, 18 Dec 2019 10:55:03 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:37834) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1ihbfC-00018W-2Z for bug-gnu-emacs@gnu.org; Wed, 18 Dec 2019 10:55:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1ihbfC-00051m-1u for bug-gnu-emacs@gnu.org; Wed, 18 Dec 2019 10:55:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 18 Dec 2019 15:55:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 38632 X-GNU-PR-Package: emacs Original-Received: via spool by 38632-submit@debbugs.gnu.org id=B38632.157668444819254 (code B ref 38632); Wed, 18 Dec 2019 15:55:02 +0000 Original-Received: (at 38632) by debbugs.gnu.org; 18 Dec 2019 15:54:08 +0000 Original-Received: from localhost ([127.0.0.1]:43807 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ihbeJ-00050U-Mk for submit@debbugs.gnu.org; Wed, 18 Dec 2019 10:54:07 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:38493) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ihbeI-0004zy-Ej for 38632@debbugs.gnu.org; Wed, 18 Dec 2019 10:54:06 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:44953) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ihbeC-0004Wh-4w; Wed, 18 Dec 2019 10:54:00 -0500 Original-Received: from [176.228.60.248] (port=2797 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1ihbeB-0001LT-BP; Wed, 18 Dec 2019 10:53:59 -0500 In-reply-to: (message from Robert Pluim on Wed, 18 Dec 2019 10:05:58 +0100) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.51.188.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:173521 Archived-At: > From: Robert Pluim > Cc: Ihor Radchenko , 38632@debbugs.gnu.org > Date: Wed, 18 Dec 2019 10:05:58 +0100 > > Eli> I think, instead of calling prctl in systhread.c, we should call > Eli> pthread_set_name_np, and the configure-time test for prctl should be > Eli> replaced with a test for pthread_set_name_np. > > Would it not be easier to call prctl in the context of the created > thread? That way it deals with the name length issues for us: > pthread_setname_np fails if strlen(name) >= 16, wherease prctl > truncates. AFAIU, prctl is Linux-specific, whereas pthread_setname_np is supported on other Posix platforms that provide pthreads. Also, prctl has another disadvantage, in that it requires you to pass the name to the thread being created, or put it in some global. OTOH, truncating a string is not exactly rocket science, we can do that ourselves before calling the API. (Btw, the limitation is 16 bytes, including the terminating null, so truncation needs to be clever about non-ASCII characters, and I wonder what does prctl do when 15 bytes end in the middle of a multibyte sequence.)