emacs 24.3.1: output from async-shell-command is not always displayed

[Ken Brown]

On 6/17/2014 2:22 PM, Filipp Gunbin wrote:
> Here are the steps to reproduce.
>
> M-& echo "sleep 1; ps &" > /tmp/1.sh
>
> Then M-& /tmp/1.sh (few times).
>
> On my machine, sometimes it gives the output in the *Async Shell
> Command* buffer, sometimes not.  Without "sleep 1" the output is
> displayed almost always.
>
> M-! /tmp/1.sh displays the output always.

I'm seeing something different, but I'm running a pretest of emacs-24.4 
rather than emacs-24.3.  I find that the output is never displayed, with 
or without "sleep 1".  But if I remove the "&" from 1.sh, then the 
output is always displayed (again, with or without "sleep 1").  Could 
you try installing the test release emacs-24.3.90-1 and see if you get 
the same results I'm getting?

I don't know if there's a bug here or not.  If there is, it's not 
specific to Cygwin; I get the same behavior on Fedora 20.

Do you have a use case for wanting to call asynchronously a command 
that's already running asynchronously (because of the "&")?

Ken

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