Hal Murray skrev:
I'm interested in the case where interrupts and scheduling are
enabled so there may be arbitrary gaps inserted into the simple
code.
Interrupts enabled means that you can't make it reliable.
Sure you can. Just compare the two high samples and try again if they are
different.
This disadvantage is that you get more jitter on how long it takes to get the
answer. That may be better than taking the overhead of a system call to get
into the kernel.
If we are talking about timestamping an interrupt for instance this
should not be a major issue. For a micro-kernel, things which normally
go into a device driver should be put in a suitable task.
Cheers,
Magnus
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