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Diffstat (limited to 'open_issues/clock_gettime.mdwn')
| -rw-r--r-- | open_issues/clock_gettime.mdwn | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/open_issues/clock_gettime.mdwn b/open_issues/clock_gettime.mdwn index c06edc9b..5345ed6b 100644 --- a/open_issues/clock_gettime.mdwn +++ b/open_issues/clock_gettime.mdwn @@ -39,3 +39,33 @@ IRC, freenode, #hurd, 2011-08-26: < youpi> yes, it should work < braunr> sure < youpi> and that's the way I was considering implementing it + +IRC, freenode, #hurd, 2011-09-06: + + <pinotree> yeah, i had a draft of improved idea for also handling + nanoseconds + <tschwinge> pinotree: Ah, nice, I thought about nanoseconds as well. + <tschwinge> pinotree, youpi: This memory page is all-zero by default, + right? + <tschwinge> Can't we then say that its last int is a version code, and if + it is 0 (as it is now), we only have the normal mapped time field, if it + is 1, we also have the monotonic cliock and ns precision on address 8 and + 16 (or whatever)? + <tschwinge> In case that isn't your plan anyway. + <youpi> it's all-zero, yes + <tschwinge> Or, we say if a field is != 0 it is valid. + <youpi> making the last int a version code limits the size to one page + <youpi> I was thinking a field != 0 being valid is simpler + <youpi> but it's probably a problem too + <youpi> in that glibc usually caches whether interfaces are supported + <tschwinge> Wrap-around? + <youpi> for some clocks, it may be valid that the value is 0 + <youpi> wrap-around is another issue too + <tschwinge> Well, then we can do the version-field thing, but put it right + after the current time field (address 8, I think)? + <youpi> yes + <youpi> it's a bit ugly, but it's hidden behind the structure + <tschwinge> It's not too bad, I think. + <youpi> yes + <tschwinge> And it will forever be a witness of the evolving of this + map_time interface. :-) |