t: expiration time, prd: period, now: current time. Return true if expired

t: expiration time, prd: period, now: current time. Return true if expired

This function executes in interrupt context, thus it should copy data somewhere fast. Note that newlib's malloc is not thread safe, thus use our lock-

Memcopy with strictly ordered memory access, e.g. for register targets. * \param dst Destination data is copied to. * \param src Source data is copied

Memcopy with strictly ordered memory access, e.g. for register targets. * \param dst Destination data is copied to. * \param src Source data is copied

NOTE(lsm): do only one iteration of reads, cause some systems (e.g. FreeRTOS stack) return 0 instead of -1/EWOULDBLOCK when no data

NOTE(lsm): do only one iteration of reads, cause some systems (e.g. FreeRTOS stack) return 0 instead of -1/EWOULDBLOCK when no data

NOTE(lsm): do only one iteration of reads, cause some systems (e.g. FreeRTOS stack) return 0 instead of -1/EWOULDBLOCK when no data