From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>
Cc: Steve Wise
<swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>,
sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 1/2] RPING: Make sure CQ event thread exits before destroying the CQ.
Date: Wed, 20 Oct 2010 14:31:52 -0600 [thread overview]
Message-ID: <20101020203152.GN10362@obsidianresearch.com> (raw)
In-Reply-To: <AANLkTi=uAuXT1RMEQ+vsA4FkN2828mZ2q0KPKXxpb6H0-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On Wed, Oct 20, 2010 at 10:05:36PM +0200, Bart Van Assche wrote:
> Are you aware that in general it is easy to trigger a deadlock or
> other undesired behavior by invoking pthread_cancel() ? If a thread
> e.g. gets canceled after having obtained a mutex lock and before that
> mutex is unlocked, this will cause trouble for any other thread that
> tries to grab the mutex.
Steve's specific case looks OK to me, at least considering how mlx4
and ibverbs operates, but I'm not sure that verbs and all of the
drivers have been carefully designed with cancellation safety in mind?
ie what happens to a ibv_poll_cq version that calls out to the kernel
like soft-iwarp? That will probably embed a cancelation point. Should
ibv_poll_cq be a cancellation point? etc..
Jason
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prev parent reply other threads:[~2010-10-20 20:31 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-20 19:28 [PATCH 1/2] RPING: Make sure CQ event thread exits before destroying the CQ Steve Wise
[not found] ` <20101020192859.1431.68877.stgit-T4OLL4TyM9aNDNWfRnPdfg@public.gmane.org>
2010-10-20 19:29 ` [PATCH 2/2] RPING: Remove printf for FLUSH completion Steve Wise
[not found] ` <20101020192905.1431.40267.stgit-T4OLL4TyM9aNDNWfRnPdfg@public.gmane.org>
2010-10-20 21:12 ` Hefty, Sean
[not found] ` <CF9C39F99A89134C9CF9C4CCB68B8DDF25B801FB15-osO9UTpF0USkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
2010-10-21 12:30 ` Steve Wise
2010-10-20 20:05 ` [PATCH 1/2] RPING: Make sure CQ event thread exits before destroying the CQ Bart Van Assche
[not found] ` <AANLkTi=uAuXT1RMEQ+vsA4FkN2828mZ2q0KPKXxpb6H0-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-10-20 20:12 ` Steve Wise
[not found] ` <4CBF4D30.3050500-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
2010-10-20 20:23 ` Bart Van Assche
[not found] ` <AANLkTimTpM_h7P8tacZic2aP7i=dBiAquDN5S_D881ae-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-10-20 20:26 ` Steve Wise
2010-10-20 20:35 ` Jason Gunthorpe
[not found] ` <20101020203551.GO10362-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2010-10-20 20:56 ` Steve Wise
[not found] ` <4CBF5786.2020203-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
2010-10-20 21:05 ` Robert D. Russell
2010-10-20 21:16 ` Jason Gunthorpe
[not found] ` <20101020211617.GP10362-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2010-10-21 10:16 ` Bart Van Assche
[not found] ` <AANLkTi=eJdjgQ4MKPxddUA2eBOswf-5fo5wm=JzX=Hib-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-10-21 10:40 ` Bart Van Assche
2010-10-20 20:31 ` Jason Gunthorpe [this message]
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