[Bug-gnulib] Re: GNULib Module gettime Breaks CVS Build On Windows

[Derek Robert Price]

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Jim.Hyslop wrote:

>I wrote:
>
>>BTW, I'm also experimenting with the select() workaround (to
>>overcome Sleep()'s 10 ms granularity) - just in case this is
>>another function that accepts a high-resolution input but
>>makes it lower resolution under the hood. I'll post the
>>results as soon as I have finished.
>
>
>Bad news. It appears that select() will still wait about 10 milliseconds
>before timing out, even if you specify 1 microsecond as the delay.
>
>I ran my test program (below) 6 times with a 100 microsecond timeout, and
>the times reported were 10.0118, 10.0125, 10.0125, 10.0124, 10.0124, and
>10.0124 milliseconds. Running it with a 1 microsecond timeout had no
effect
>on the output.


That's no worse than the 10ms granularity of the Sleep() command,
however, so since select() is the most portable solution across UNIX
systems, accepts micorsecond resolution even on Windows, and only the
additional inclusion of <winsock.h> would be necessary in nanosleep.c
on Windows to enable the select() function there, select() is probably
still our best option.  If Windows ever updates their select() to use
the finer timeout granularity, then we would inherit that new behavior.

Derek

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