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From: Pedro Alves <pedro@codesourcery.com>
To: gdb@sourceware.org
Subject: Re: Multiple remote inferiors
Date: Wed, 06 Apr 2011 17:44:00 -0000
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Cc: Kevin Pouget <kevin.pouget@gmail.com>
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On Wednesday 06 April 2011 16:02:15, Kevin Pouget wrote:
> Hello,
> 
> it looks like it's not possible to connect to several
> remote/extended-remote inferiors at the same time:
> 
> (gdb) target remote :1234
> ...
> (gdb) add-inferior
> Added inferior 2
> (gdb) inferior 2
> [Switching to inferior 2 [process 0] (<noexec>)]
> (gdb) target remote :1235
> A program is being debugged already.  Kill it? (y or n)
> 
> 
> and I was wondering what was the reason?

GDB support multiple processes, but they currently
all need to be behind the same target.

For remote targets, only extended-remote allows that.
E.g., adding a new inferior with add-inferior, switching
to it, and doing "start", should work.

> it should theoretically be possible, 

This is just software, so in theory, anything
is possible.  :-)

> now that multiprocess debugging
> has been enabled, so maybe it's because remote.c relies a lot on
> global variables?

It goes further beyond that.  There's only one target_ops stack.
Going multi-target would be awesome.

-- 
Pedro Alves