posix: multi process: add support for times() #97357
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Add support for the `times()` function, which can be used to get the number of ticks spent in "system" and "user" mode, and which returns the "real time" that has expired, since an arbitrary point in the past. The following invariant should always hold: rtime <= stime + utime The `times()` function measures time for the calling process and all of it's child processes. In Zephyr, we don't support separate processes (yet), so the time spent in child processes is zero. Additionally, in Zephyr we do not differentiate between "system" time (i.e. time spent executing kernel code) and "user" time (time spent executing application code). We only have information on "total time" (time spent executing code) and "execution time" (time spent executing code plus idle time). For now, only report utime, since it is not clear how to obtain other values. Signed-off-by: Chris Friedt <[email protected]>
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area: POSIX
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sylvioalves
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Oct 13, 2025
Add a testsuite for the POSIX_MULTI_PROCESS Option Group. Signed-off-by: Chris Friedt <[email protected]>
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sylvioalves
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ycsin
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Add support for the
times()function, which can be used to get the number of ticks spent in "system" and "user" mode, and which returns the "real time" that has expired, since an arbitrary point in the past.The following invariant should always hold:
The
times()function measures time for the calling process and all of it's child processes. In Zephyr, we don't support separate processes (yet), so the time spent in child processes is zero.Additionally, in Zephyr we do not differentiate between "system" time (i.e. time spent executing kernel code) and "user" time (time spent executing application code). We only have information on "total time" (time spent executing code) and "execution time" (time spent executing code plus idle time).
For now, only report utime, since it is not clear how to obtain other values.
The
times()function is part of thePOSIX_MULTI_PROCESSOption Group. For more information, please seehttps://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_subprofiles.html
Closes #51978
Note
This was added in order to facilitate lua as a Zephyr module
cc @tenllado @oscarbaselga @alexayl @agguo @danjshaw