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Today's Topics:
1. Re: Threading (lack of) interleaving (Chris Schneider)
2. How to construct complex string (martin)
----------------------------------------------------------------------
Message: 1
Date: Mon, 5 Aug 2013 09:11:04 -0600
From: Chris Schneider <ch...@christopher-schneider.com>
To: beginners@haskell.org
Subject: Re: [Haskell-beginners] Threading (lack of) interleaving
Message-ID:
<CAGHc4uiUOf4hQ-eecp=UqWMVU5_Ry-S7D3TOJrMdWPthY=s...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Ok, I've figured out my problem - it wasn't threading related at all -
instead it was the second thread dying off due to a ZMQ problem.
Specifically I was reusing the node name, which apparently isn't allowed.
Tweaking it such that it uses a different name for each fixes the issue.
On Sun, Aug 4, 2013 at 10:05 PM, Chris Schneider <
ch...@christopher-schneider.com> wrote:
> Hi, I'm working on a program that should launch, spawn two threads, each
> with a zeromq connection, where those threads ping the zmq channel
> repeatedly. The main thread just sits and waits.
>
> The code is here: https://gist.github.com/cschneid/3862b33c29a803be7848
>
> If I launch one thread, or the other (lines 13 & 14), and comment the
> other one out, it runs as expected.
>
> But if I attempt to launch both, both build themselves, and run one call
> of themselves, but then it seems that one or the other thread "wins", and
> the other never gets to run again. Most of the time it's the first one
> launched that wins, but not always. See the output for an example.
>
> Adding explicit yield calls, using forkOS vs forkIO, and moving around of
> where I make the ZMQ context & socket (into and out of the threads) don't
> seem to help.
>
> What am I missing? How can I get these threads to play nice with each
> other?
>
> Thanks!
>
>
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Message: 2
Date: Mon, 05 Aug 2013 21:37:18 +0200
From: martin <martin.drautzb...@web.de>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: [Haskell-beginners] How to construct complex string
Message-ID: <51fffeee.5050...@web.de>
Content-Type: text/plain; charset=ISO-8859-15
Hello all,
recently I was working on a haskell program, which does some
calculations and the produces a "plot", i.e. a set of Tikz (a LaTeX
thing) commands.
While this was not a problem in itself, it lacked composability. While
all my plots show a grid, a caption and some data points, some of them
additionally show a line with a legend, some of them show two.
Now I clearly do not want to duplicate the entire function just to add
another line. I'd rather construct the Tikz commands (which at the end
of the day is just a String) in a stepwise fashion.
When constructing the set of Tikz commands, I cannot rely that
additional commands are placed at the end. It is typically more an
inside-out thing. The last thing I need to do is wrap the whole thing in
\begin and \end directives.
Additionally there may be "global" values (like the scale) which need to
be known at more than one step. I had a brief look at the "Diagrams"
package, which MUST have similar issues, and they "do everything with
monoids", but I fail to see the light.
Could anyone point me in the right direction?
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