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Re: [Xen-devel] ring.h notification hold-off question
| To: | Daniel Stodden <stodden@xxxxxxxxxx>, Xen Developers <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] ring.h notification hold-off question |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Sat, 10 Nov 2007 09:40:19 +0000 |
| Delivery-date: | Sat, 10 Nov 2007 01:35:08 -0800 |
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| Thread-topic: | [Xen-devel] ring.h notification hold-off question |
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On 10/11/07 05:37, "Daniel Stodden" <stodden@xxxxxxxxxx> wrote: > b) if __old were UINT_MAX, then the consumer side might/would > set req_event to 0 after catching up right? (req_cons(== req_prod)+1) > now assume __new == __old + 2 then we had > > req_event [0] < __new [1] < __old [INT_MAX] > > i.e. > __new - req_event [1] > __new - __old [-1] > > i.e. _notify=false, which i believe skips a wanted notification. No. req_event==0, new==1, old==UINT_MAX. Then new-req_event==1, new-old==2. Hence a notification will be sent. Case (c) you are also wrong because after the subtractions we cast to an unsigned integer. Hence in the case old<new<req_event, new-req_event will be a large +ve integer, not a small -ve one. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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