utimensat UTIME_NOW granularity bug
Fri Oct 9 03:24:00 GMT 2009
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According to Christopher Faylor on 10/8/2009 3:24 PM:
>> I think we need to implement a companion to systime(), which returns the system
>> time without any truncation, so that the function clock_gettime(CLOCK_REALTIME)
>> can report time with resolution to the 10th of a microsecond rather than to
>> plain microseconds. Then utimensat needs to use clock_gettime rather than
>> gettimeofday, so that it is not needlessly truncating the 10th of microsecond
>> resolution available from Windows.
> Why not send these type of musings to the cygwin-developers list? It really
> is more appropriate for this type of discussion.
Sorry about the wrong list. At any rate, what about this patch?
2009-10-08 Eric Blake <email@example.com>
* hires.h (hires_ms): Change initime_us to initime_ns, with 10x
(hires_ms::nsecs): New prototype.
(hires_ms::usecs, hires_ms::msecs, hires_ms::uptime): Adjust.
* times.cc (NSPERMS, MILLION, BILLION): New helper macros; use
throughout to avoid long runs of 0.
(systime_ns): New helper function.
(hires_ms::prime): Use it for more resolution.
(hires_ms::usecs): Change to...
(hires_ms::nsecs): ...with more resolution.
(clock_gettime): Use more resolution.
* fhandler_disk_file.cc (utimens_fs): Get current time before
opening handle, using higher resolution.
Don't work too hard, make some time for fun as well!
Eric Blake firstname.lastname@example.org
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