[ovs-dev] [PATCH 1/2] timeval: clock_gettime() for Windows.

Ben Pfaff blp at nicira.com
Tue Mar 4 16:59:59 UTC 2014


On Mon, Mar 03, 2014 at 02:46:27PM -0800, Gurucharan Shetty wrote:
> QueryPerformanceCounter() retrieves the current value of the performance
> counter, which is a high resolution (<1us) time stamp that can be used for
> time-interval measurements. So, use it for MONOTONIC clock.
> 
> The GetSystemTimePreciseAsFileTime() function retrieves the current system date
> and time with the highest possible level of precision (<1us). Use it for
> real time clock. This function returns a counter representing the number of
> 100-nanosecond intervals since January 1, 1601. To make it compatible with
> Linux CLOCK_REALTIME, we need to calculate the 100-nanoseconds counter value
> till 01/01/1970.
> 
> An upcoming commit implements gettimeofday() using the same clock, so,
> carve out a function.
> 
> Signed-off-by: Gurucharan Shetty <gshetty at nicira.com>

Acked-by: Ben Pfaff <blp at nicira.com>

I'd also be OK with implementing this in terms of xclock_gettime() on
all platforms.



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