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Re: FAQ: gnuplot vs. emacs' compile command

From: Kim F. Storm
Subject: Re: FAQ: gnuplot vs. emacs' compile command
Date: 12 Feb 2004 15:43:56 +0100
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3.50

Did anyone actually look at this bug back in May ?
FYI, I have included the text at the referenced link here.

Dan Jacobson <address@hidden> writes:

> Fellas, the gnuplot team may have found ugly emacs process bugs, see
> <...>

: Dan Jacobson <address@hidden> wrote:
: > Using emacs -eval '(compile "make")'
: > With: echo "plot 'file';pause -1"|gnuplot -persist
: > just flashes the graph for a split second.
: So let's get into dissecting this further.  The first candidate to
: remove is 'make'.  It doesn't really do anything useful in this whole
: setup, so we might as well get rid of it.  Let's replace it by a shell
: script doing the same things.  And while at it, let's get rid of the
: separate data file, too:
: --- gpaction ---
: gnuplot -persist <<EOS
:  plot '-'
:    1 1
:    2 2
:   e
: ---- end ---
: sh gpaction                                 # does the plot and returns
: emacs -eval '(compile "sh gpaction")'       # doesn't plot, but returns
: emacs -eval '(shell-command "sh gpaction")' # plot, but no return
: For the latter, emacs is unresponsive --- it's obviously waiting for
: something to happen, which doesn't.  Only after you terminate the
: gnuplot graph window (key 'q' into it), or press Ctrl-G in emacs to
: forcibly break out of the wait loop, it will continue.
: During that pause, look at the output from 'ps jx' and you'll find
: that gnuplot_x11 is an orphan --- i.e. it's the only surviving process
: in its process group.  In "shell-command", emacs apparently doesn't
: kill it, whereas in "compile", it probably does.
: -- 
: Hans-Bernhard Broeker (address@hidden)
: Even if all the snow were burnt, ashes would remain.

Kim F. Storm  http://www.cua.dk

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