From bug-octave-request at bevo dot che dot wisc dot edu  Tue Aug 22 01:19:55 2000
Subject: Bug report for parse.y function frob_function_def()
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: "Martin Lang" <martin dot lang at lanatech dot de>
Cc: <bug-octave at bevo dot che dot wisc dot edu>
Date: Tue, 22 Aug 2000 01:17:51 -0500 (CDT)

On 20-Aug-2000, Martin Lang <martin dot lang at lanatech dot de> wrote:

| Bug report for Octave 2.0.16 configured for i386-pc-cygwin32
| 
| Description:
| -----------
|   Configure script defined the following item in config.h
| 
|   #define HAVE_GETTIMEOFDAY 1
| 
|   After having octave compiled with this option, the time determination did
| not
|   work (new files will not be recognized)
| 
| 
| Repeat-By:
| ---------
| 
|   N.A.
| 
| Fix:
| ---
| 
|   One place for the problem may be in parse.y function frob_function_def:
| 
|   see Appendix 1.
| 
|   The problem may be the following line:
| 
|       time_t now = time (0);
| 
| 
|   Function which use the same context, e.g. function symbol_out_of_date() in
| variables.cc,
|   use the following code:
| 
| #if defined (HAVE_GETTIMEOFDAY)
|     struct timeval tv;
| #if defined  (GETTIMEOFDAY_NO_TZ)
|     gettimeofday (&tv);
| #else
|     gettimeofday (&tv, 0);
| #endif
|     double now = (double) tv.tv_sec + (double) tv.tv_usec / 1e6;
| #else
|     double now = (double) time (0);
| #endif
| 
|   see Appendix 2
| 
| 
|   There might be other places with the problem, which I did not find.

In my current sources (version 2.1.x), I think most uses of time are
now handled by the class octave_time, which encapsulates code similar
to what you have above.

One problem that remains, however, is that most systems only store
file time stamps with a one second resolution, and Octave currently
has no way to use more accurate information even if it is available.
Would anyone be interested in taking a crack at finding a clean
solution for this problem?

Thanks,

jwe



-----------------------------------------------------------------------
Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.che.wisc.edu/octave/octave.html
How to fund new projects:  http://www.che.wisc.edu/octave/funding.html
Subscription information:  http://www.che.wisc.edu/octave/archive.html
-----------------------------------------------------------------------