Re: Was: [ros-dev] Re: [ros-svn] [hbirr] 14988: - Guard the copying to the IOSB.

[Joseph Galbraith]

>   If a driver returns immediately with an error status,
> it isn't necessary
>  to signal any event. The caller does only wait on the event, if the
>  driver returns STATUS_PENDING (Some user mode functions may only check
>  for an error). If the driver returns STATUS_PENDING, the driver has
>  called  IoMarkIrpPending , which sets Irp->PendingReturned. The error
>  path without STATUS_PENDING must not do anything. 
I'm not sure how it relates to this discussion (if at all)
but I'm pretty sure that under windows, that if I have
a file handle associated with a completion port, that
the completion notification is delivered to the port
regardless of whether it pended or not.

(I depend on this behavior in my apps... it means I only
have one place where I process I/O results.)

I also believe that I can wait on the OVERLAPPED's
event to detect completion (regardless of whether
the I/O pended or not.)

Thanks,

Joseph