Re: 1.5.0 - gettimeofday() out of sync with Windows time

[Larry Hall <cygwin-lh at cygwin dot com>]

Chris Church wrote:

> I'm using version 1.5.0 of the cygwin1.dll on Windows 2000 
> Professional.  I've also seen the problem described below on earlier 
> versions of cygwin (1.3.22).
>
> I've found that the gettimeofday() and ftime() functions do not always 
> return the correct system time as reported by Windows.  The time() 
> function, however, always remains in sync with Windows time.  This 
> discrepancy occurs when an application is started, then the Windows 
> system time changes, then the application calls gettimeofday() or 
> ftime() to retrieve the current system time.   Both gettimeofday() and 
> ftime() always report the same incorrect time.  It also appears that the 
> time as reported by gettimeofday() and ftime() is based on a counter 
> that is initialized to match the system time, but once started, 
> increments at a constant rate regardless of any changes to the Windows 
> time.  (I have not yet dug into the source for Cygwin to see how these 
> functions are implemented.)  Finally, the time reported by 
> gettimeofday() and ftime(), when used within an application that runs 
> for an extended period of time, will drift from the Windows time.
>
> Is this a known issue with Cygwin, and are there any patches available?


Not yet.  But this was mentioned on the developer's list this morning
and someone is looking at the problem.


--
Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
838 Washington Street                   (508) 893-9889 - FAX
Holliston, MA 01746


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