From owner-freebsd-threads@freebsd.org Wed Aug 7 09:37:01 2019 Return-Path: Delivered-To: freebsd-threads@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 0FDB4C4887 for ; Wed, 7 Aug 2019 09:37:01 +0000 (UTC) (envelope-from freebsd.ed.lists@sumeritec.com) Received: from out1-4.antispamcloud.com (out1-4.antispamcloud.com [185.201.16.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 463RH03Hjdz4T1f for ; Wed, 7 Aug 2019 09:37:00 +0000 (UTC) (envelope-from freebsd.ed.lists@sumeritec.com) Received: from srv31.niagahoster.com ([153.92.8.106]) by mx66.antispamcloud.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1hvINI-0000mr-DF for freebsd-threads@freebsd.org; Wed, 07 Aug 2019 11:36:58 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sumeritec.com; s=default; h=Content-Transfer-Encoding:Content-Type: MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To:From:Date:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=AEvf/XU3juxJiVkBxNWdmKQSpBjTelO3dEX3J0sE6Js=; b=coGdQwuwvsYehwBK4vsKkdEyvV 8dCQ0p/hWvxpXTwRIRtS166PQ2dgAjcIRIo57F0boz5yQtHFlXNx54WA3HaP4+1jYXALJztLD1tHT GtMhgBoh87uqD+FFC86SAYMXK3FGifjNtRPaC3fDOlqvEqRvWef7B91zt+K1QeLSFphGVV/1OckFY 8O/NTKq/Y+WEBu+ehDCB9KypjOxjeAfQ2dP80MFuHDJqNo705+foB6GYLktXLpt440vbRnQI4zp2/ If5GzjCJHzJAN/WIPvQGswZ4R50AG7Ff5Mz6bHOD6PUJ7lYtvcu18cqz2owwuOXBLiCqEzDJyRqU1 r96cGWSA==; Received: from [114.125.102.203] (port=21615 helo=Ryzen1.sumeritec.com) by srv31.niagahoster.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92) (envelope-from ) id 1hvIN8-00085w-Lr; Wed, 07 Aug 2019 16:36:48 +0700 Date: Wed, 7 Aug 2019 17:36:40 +0800 From: Erich Dollansky To: Konstantin Belousov Cc: Daniel Eischen , freebsd-questions@freebsd.org, freebsd-threads@freebsd.org Subject: Re: mutex held in a thread which is cancelled stays busy Message-ID: <20190807173640.0b2e3aa8.freebsd.ed.lists@sumeritec.com> In-Reply-To: <20190807092035.GG2731@kib.kiev.ua> References: <20190806165429.14bc4052.freebsd.ed.lists@sumeritec.com> <1FC05CEB-982F-484F-9E41-5A74FF564494@freebsd.org> <20190807071002.GF2731@kib.kiev.ua> <20190807163757.2b5d52fa.freebsd.ed.lists@sumeritec.com> <20190807092035.GG2731@kib.kiev.ua> MIME-Version: 1.0 Content-Type: text/plain; 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NEURAL_SPAM_SHORT(0.97)[0.972,0]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[sumeritec.com]; NEURAL_SPAM_MEDIUM(0.96)[0.960,0]; BAD_REP_POLICIES(0.10)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_SPAM_LONG(0.98)[0.979,0]; MID_CONTAINS_FROM(1.00)[]; R_SPF_NA(0.00)[]; GREYLIST(0.00)[pass,meta]; RCVD_TLS_ALL(0.00)[] X-Spam: Yes X-BeenThere: freebsd-threads@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Threading on FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2019 09:37:01 -0000 Hi, On Wed, 7 Aug 2019 12:20:35 +0300 Konstantin Belousov wrote: > On Wed, Aug 07, 2019 at 04:37:57PM +0800, Erich Dollansky wrote: > > Hi, > > > > On Wed, 7 Aug 2019 10:10:02 +0300 > > Konstantin Belousov wrote: > > > > > On Tue, Aug 06, 2019 at 08:58:30PM -0400, Daniel Eischen wrote: > > > > > > > > > On Aug 6, 2019, at 4:54 AM, Erich Dollansky > > > > > wrote: > > > > > > > > > > Hi, > > > > > > > > > > for testing purpose, I did the following. > > > > > > > > > > Start a thread, initialise a mutex in a global variable, lock > > > > > the mutex and wait in that thread. > > > > > > > > > > Wait in the main program until above's thread waits and > > > > > cancel it. > > > > > > > > > > Clean up behind the cancelled thread but leave intentional the > > > > > mutex locked. > > > > > > > > > > I would have expected now to get an error like 'EOWNERDEAD' > > > > > doing operations with that mutex. But I get 'EBUSY' as the > > > > > error. > > > > > > > > Are you initializing the mutex as a robust mutex, via > > > > pthread_mutexattr_setrobust()? Are you using _lock() or > > > > _trylock()? > > > Robust mutexes only have special properties on the process > > > termination. They behave same as the normal mutexes if the owning > > > thread is terminated. > > > > > man says: > > > > [EOWNERDEAD] The argument mutex points to a robust mutex and the > > previous owning thread terminated while holding the mutex lock. > > So what ? It describes the case when error can be returned, but it is > not required to do so. POSIX wording is the following: > what does POSIX matter when the manual of the operating system the program is running on states something else? Erich