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Re: [Xen-devel] [PATCH] SCHEDOP_block_masked

On 10 Mar 2006, at 11:43, John Levon wrote:

It uses event_pending() which will be zero:

     76 #define event_pending(v)                        \
     77     (!!(v)->vcpu_info->evtchn_upcall_pending &  \
     78       !(v)->vcpu_info->evtchn_upcall_mask)

But, now you mention it, I wonder if this wouldn't be better taking an
event channel to check on before sleeping (though we'd still wake on
any). This would avoid the small race (which doesn't really matter in
the context we've been using this).

Can you give more details about the usage scenario? What ultimately allows the VCPU to continue running (presumably by clearing its evtchn_upcall_mask)?

 -- Keir

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