On 02/27/14 07:02, John-Mark Gurney wrote:
2) Why do you try to start read/write transfers in the _filter? You
should just check to see if data is available and not do work.. This
is also important since kqueue calls the filter just before delivering
the knote to userland to verify that there is still data, and it will
call your _event function for each knote on the fd... The work should
be started through other mechanisms, like read/write syscall or
interrupt or timeout/callout... If it's required to get results from
USB_IF_POLL, then it's fine..
In the case where you start polling and don't do any reads or writes,
the poller needs to get the data traffic going.
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