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lib: posix: nanosleep: fix nanosleep for sub microsecond durations #28542

Merged
merged 2 commits into from
Oct 2, 2020
Merged

lib: posix: nanosleep: fix nanosleep for sub microsecond durations #28542

merged 2 commits into from
Oct 2, 2020

Commits on Sep 22, 2020

  1. lib: posix: nanosleep: round up to the nearest microsecond 

    We must round up to the nearest microsecond in order to fulfill the
nanosleep(2) API requirement of sleeping for *at least* that many
nanoseconds.

The only platform with an upper-bound check right now is Nordic.

Fixes #28483

Signed-off-by: Christopher Friedt <[email protected]>
    @cfriedt
    cfriedt committed Sep 22, 2020
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  2. tests: posix: nanosleep: round up to the nearest microsecond 

    Here, we include some addtional tests for durations that have
sub-microsecond components.

1ns => k_busy_wait(0). Round to 1us.
1us + 1ns => k_busy_wait(1us). Round to 2us.
1s + 1ns => k_busy_wait(1000000us). Round to 1000001us.
1s + 1us + 1ns => k_busy_wait(1000001us). Round to 1000002us.

Fixes #28483

Signed-off-by: Christopher Friedt <[email protected]>
    @cfriedt
    cfriedt committed Sep 22, 2020
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