From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: "Basil L. Contovounesios" Newsgroups: gmane.emacs.bugs Subject: bug#33018: 26.1.50; thread starvation with async processes and accept-process-output Date: Sun, 14 Oct 2018 16:00:56 +0100 Message-ID: <87h8hoh8t3.fsf@tcd.ie> References: <87r2gwbmma.fsf@tcd.ie> <83o9bzwpty.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1539529206 28086 195.159.176.226 (14 Oct 2018 15:00:06 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 14 Oct 2018 15:00:06 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) Cc: 33018@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Oct 14 17:00:01 2018 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gBhs8-00079w-Vq for geb-bug-gnu-emacs@m.gmane.org; Sun, 14 Oct 2018 17:00:01 +0200 Original-Received: from localhost ([::1]:48668 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gBhuF-0002z6-Lp for geb-bug-gnu-emacs@m.gmane.org; Sun, 14 Oct 2018 11:02:11 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:58143) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gBhu9-0002yy-VD for bug-gnu-emacs@gnu.org; Sun, 14 Oct 2018 11:02:06 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gBhu5-0007no-Ui for bug-gnu-emacs@gnu.org; Sun, 14 Oct 2018 11:02:05 -0400 Original-Received: from debbugs.gnu.org ([208.118.235.43]:45178) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1gBhu5-0007nk-Py for bug-gnu-emacs@gnu.org; Sun, 14 Oct 2018 11:02:01 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1gBhu5-000099-MS for bug-gnu-emacs@gnu.org; Sun, 14 Oct 2018 11:02:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: "Basil L. 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Contovounesios" >> Date: Thu, 11 Oct 2018 15:57:50 +0100 >> >> I attach a sample program test.el whose central function, test-slave, >> invokes wget asynchronously before waiting for the process to exit. >> >> The issue I'm facing is that running test-slave twice in succession, >> each time in a new thread, causes accept-process-output to hang with no >> output (unless a timeout argument is given, in which case the function >> returns nil) the second time around. > > When the hang happens, is there any wget process still alive, or did > they all exit? Please use OS tools to find that out, don't rely on > what Emacs thinks. When the hang happens, the wget process launched by the waiting thread is still alive but asleep (idle), as reported by ps and top. -- Basil