Odd Time of Day Reported with Ticker

[Sebastian Huber]

On 19/01/16 15:39, Joel Sherrill wrote:
> The tasks are delaying 500, 1000, and 1500 ticks 
> with nanoseconds_per_tick = 10000000. Delay operations are guaranteed 
> to be a minimum of the requested amount and this is not being honored.

For the ticks based services this is not true, you wait to the n-th 
tick. If you are 1ps before it, you wait 1ps + interrupt processing time.

>
> I know this is a duration specified in clock ticks but it is really 
> (ticks * nanoseconds per tick) long in real time.
>
> I have not checked delays like sleep() and nanosleep() but tick based 
> ones are 1 tick too short.

This is a known issue and results for example in libstdc++ testsuite 
failures.

-- 
Sebastian Huber, embedded brains GmbH

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