Suggestions on Avoiding syscall Overhead
des at des.no
Mon Apr 30 20:42:22 UTC 2007
Robert Watson <rwatson at FreeBSD.org> writes:
> Unfortunately, this sort of thing can't be expressed using the
> standard APIs. This leaves us two choices: allow the behavior of
> standard APIs to be configured at some granularity, or introduce new
> APIs. My feeling is we should prefer new APIs, and suggest that
> programmers use those. Take a look at sys/sys/time.h:1.71 for an
> example of what might make sense.
I'm not sure this is a good example.
There is already a suitable extensible API: clock_gettime(), which is
part of SUSv3. Define new CLOCK_* constants for requesting a faster,
less precise timecounter, and if you feel like it, submit it to X/Open
for inclusion in the next version of the SUS.
Dag-Erling Smørgrav - des at des.no
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