Date: Wed, 7 Aug 2019 10:10:02 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Daniel Eischen <deischen@freebsd.org> Cc: Erich Dollansky <freebsd.ed.lists@sumeritec.com>, freebsd-questions@freebsd.org, freebsd-threads@freebsd.org Subject: Re: mutex held in a thread which is cancelled stays busy Message-ID: <20190807071002.GF2731@kib.kiev.ua> In-Reply-To: <1FC05CEB-982F-484F-9E41-5A74FF564494@freebsd.org> References: <20190806165429.14bc4052.freebsd.ed.lists@sumeritec.com> <1FC05CEB-982F-484F-9E41-5A74FF564494@freebsd.org>
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On Tue, Aug 06, 2019 at 08:58:30PM -0400, Daniel Eischen wrote: > > > On Aug 6, 2019, at 4:54 AM, Erich Dollansky <freebsd.ed.lists@sumeritec.com> 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. > For _trylock(), you only get EOWNERDEAD for robust mutexes. It seems that you should get EOWNERDEAD for _lock() in this case, so if that's what you're doing, it sounds like it might be a bug. > > -- > DE > _______________________________________________ > freebsd-threads@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-threads > To unsubscribe, send any mail to "freebsd-threads-unsubscribe@freebsd.org"
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