From: "Mauricio Fernández" <batsman.geo@...>
Date: 2003-02-27T21:25:59+09:00
Subject: Re: Threads, pipes, popen, whatever

On Thu, Feb 27, 2003 at 09:19:10PM +0900, Robert Klemme wrote:
> 
> "Brian Candler" <B.Candler@pobox.com> schrieb im Newsbeitrag
> news:20030227105024.A89394@linnet.org...
> > On Thu, Feb 27, 2003 at 06:57:18PM +0900, Michael Shigorin wrote:
> > > On Tue, Feb 25, 2003 at 05:52:08PM +0900, Robert Klemme wrote:
> > > > Normally you would use IO.popen but I can't see a way to access
> > > > the exit status of the process directly.
> > >
> > > $? won't work?
> >
> > It does appear to work as advertised:
> 
> Thanks for the hint!
> 
> >   f = IO.popen("/usr/bin/false","w")
> >   f.write "ignoreme"
> >   f.close
> >   puts $?    #>> 256
> >
> > It would be nice if the status hung around as an instance variable of f
> > though.
> 
> Yes, I did not think of looking for a global variable.  This is a nice
> example of the drawbacks: If two threads use popen you can't be sure any
> more that the value you read from $? is the correct one.

Nope, $? is thread local.

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