Date: Wed, 19 Apr 2017 11:37:15 +0800 From: Sepherosa Ziehau <sepherosa@gmail.com> To: "Somayajulu, David" <David.Somayajulu@cavium.com> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Question on taskqueue_drain Message-ID: <CAMOc5cxtSakeBhskbmfW4BxsbgdRDp22AVBYrDgReCP91YLY7g@mail.gmail.com> In-Reply-To: <BY2PR07MB1474C78A241A7CA1F2396435EE180@BY2PR07MB1474.namprd07.prod.outlook.com> References: <BY2PR07MB14745123AC235B06BCD2987DEE190@BY2PR07MB1474.namprd07.prod.outlook.com> <BY2PR07MB1474C78A241A7CA1F2396435EE180@BY2PR07MB1474.namprd07.prod.outlook.com>
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On Wed, Apr 19, 2017 at 10:39 AM, Somayajulu, David <David.Somayajulu@cavium.com> wrote: > Sorry what I meant to ask was, whether it is O.K to call taskqueue_drain(), when an MTX_DEF lock is grabbed prior to calling taskqueue_drain(). > You will hit WITNESS, if the drain needs to wait; that's probably the best case. If the lock will be acquired in the task being drained, this leads to deadlock. Thanks, sephe -- Tomorrow Will Never Die
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