> O_NONBLOCK doesn't necessarily imply "never sleep", it implies "don't
> sleep waiting for an event/long time". So where the mutex is just
> serializing access to hardware that will be very brief it is fine not to
> check O_NONBLOCK/FNDELAY.
Thank you Alan for answering ! One more question I hope you don't mind...
I'm not very confident with all these POSIX definitions. Do you have any
pointers that I should know to get more familiar with them ?
Thanks
Francis
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