forked from Archive/PX4-Autopilot
Posix: Add initial stub for atomic HRT
The actual implementation is not atomic, as the value on the application layer would be limited.
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@ -211,6 +211,20 @@ hrt_abstime hrt_elapsed_time(const volatile hrt_abstime *then)
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return delta;
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}
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/*
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* Compute the delta between a timestamp taken in the past
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* and now.
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*
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* This function is safe to use even if the timestamp is updated
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* by an interrupt during execution.
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*/
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hrt_abstime hrt_elapsed_time_atomic(const volatile hrt_abstime *then)
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{
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// This is not atomic as the value on the application layer of POSIX is limited.
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hrt_abstime delta = hrt_absolute_time() - *then;
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return delta;
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}
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/*
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* Store the absolute time in an interrupt-safe fashion.
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*
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