RTEMS | Specify limits of CLOCK_MONOTONIC (uptime) (#5538)

Tue Mar 31 13:24:23 UTC 2026

Frank Kuehndel commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5538#note_147608

Just a question:

I do not understand the "32-bit targets correctness issues". I would expect the 32 bit machines use a software implementation for 64 bit arithmetic (that comes with `gcc`). Adding a small number - such as `0x1` to `0x0000 0000 FFFF FFFF` should not cause any problems - esp. no correctness problems. The software can handle the 32 bit overflow easily with a second addition on the top 32 bits (assuming unsigned 64 bit numbers). What is the problem I do not see?

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5538#note_147608
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