maxikrie opened a new pull request, #18848:
URL: https://github.com/apache/nuttx/pull/18848
current_usec() returns a uint64_t, but it used TICK2USEC(timebase) to
convert scheduler ticks to microseconds. On 32-bit clock_t builds, TICK2USEC()
performs the multiplication in 32-bit arithmetic before the result is widened.
With CONFIG_USEC_PER_TICK=10000, this wraps after about 71.6 minutes:
UINT32_MAX / 1000000 ~= 4294 seconds
After the wrap, up_timer_gettick() can report time near zero again. This can
leave absolute watchdog timeouts, such as those used by usleep() /
clock_nanosleep(), waiting for a tick value that will not be reached until the
32-bit scheduler counter wraps.
Cast timebase to uint64_t before multiplying by USEC_PER_TICK so
current_usec() remains monotonic across the 32-bit microsecond boundary.
*Note: Please adhere to [Contributing
Guidelines](https://github.com/apache/nuttx/blob/master/CONTRIBUTING.md).*
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