Re: [Iverilog-devel] periodic update of vcd file.

[Stephen W. <st...@ic...>]

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There is the existing $dumpflush command. If it doesn't flush the
data out to the file, then adding an fflush() in there somewhere
should do the trick.

I do not, in general, think the scheduler should be flushing the
vcd output, that could potentially be a nasty performance hit. But
I see where you are coming from, you want to sometimes flush and
refresh an interactive display. I can think of a couple ways of
handling that, but the easiest I think is to somehow decide at the
start that you want unbuffered output (for example, a +arg to vvp)
and turn off buffering to the fopened stream that the vcd dumper
uses.

On 05/13/2015 09:52 AM, Joshua Street wrote:
> I am trying to hook icarus into a graphviewer program, but I would 
> like to be able to periodically update what's on screen.  And yes, 
> I realized that I am probably not intended to make files in vvp 
> reliant on those in the vpi folder.
> 
> Is there a recommended path that I could use? I notice that in the 
> stop handler of vvp you call the $dumpflush command. Anyway after 
> reading a bit more of the documentation, I think the best way to 
> get the behavior I want might be to just add a command to the vpi 
> library and then call it.

- -- 
Steve Williams                "The woods are lovely, dark and deep.
steve at icarus.com           But I have promises to keep,
http://www.icarus.com         and lines to code before I sleep,
http://www.picturel.com       And lines to code before I sleep."
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