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Re: Blocking I/O to gnuplot pipe
From: |
David Bateman |
Subject: |
Re: Blocking I/O to gnuplot pipe |
Date: |
Sat, 15 Feb 2003 03:01:18 -0600 |
User-agent: |
Mutt/1.3.28i |
According to John W. Eaton <address@hidden> (on 02/14/03):
> On 14-Feb-2003, David Bateman <address@hidden> wrote:
>
> | So, what I wanted to know. Is there a file descriptor for the gnuplot
> | pipe in a script file? Can I use "fcntl" on it to clear the
> | O_NONBLOCK flag?
>
> I don't think there is really a solution for this problem (other than
> fixing gnuplot, or perhaps giving up on it entirely for Octave). Even
> if you delete the file as soon as gnuplot has opened it the first time,
> then replot will fail. And how do you know that gnuplot will have it
> opened immediately after you send the command, even with blocking I/O?
> Isn't there still a race condition?
All I have to do is assure that gnuplot has opened the file before calling
unlink. So a usleep should be able to assure this.
The replot problem however will be a real pain. I think the solution Andy
suggested is the best, since at least it is consistent with what is done
with a straight gplot call.
> BTW, you might also think that it would be better to use gnuplot's
> ability to read data in the command stream, but that has other
> problems that are just about as bad.
I'd thought about that too. I imagine the issue of replot is what you
are talking about here.
Time to give up :-)
D.
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David Bateman address@hidden
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