semaphore requirement additions / enhancements#150
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- requirements: correct Semaphore reset error semantics
- requirements: add Semaphore give-at-max and ISR usage requirements
ZEP-SRS-5-17 stated that resetting a semaphore aborts acquisitions "returning a resource contention error code". Per the k_sem_reset behavior, pending take operations are aborted with the same error used for a wait timeout (-EAGAIN), not a contention/busy code (-EBUSY, which is used for the no-wait case in ZEP-SRS-5-11). Reword the requirement to abort pending take operations and return the timeout error, consistent with ZEP-SRS-5-10. Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Audit against the k_sem API found two behaviors without a requirement: - ZEP-SRS-5-19: k_sem_give does not increment the count beyond the maximum permitted count; add a requirement that releasing a semaphore already at its maximum leaves the count unchanged. - ZEP-SRS-5-20: k_sem_give and k_sem_take (with no wait) are usable from interrupt context; add a requirement allowing release from an ISR and acquisition from an ISR when no waiting is requested. The requirements reflect the implemented k_sem behavior following the Route 3s approach and link to the Counting Semaphore system parent (ZEP-SYRS-14). Signed-off-by: Anas Nashif <anas.nashif@intel.com>
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