[Bug mi/12736] New: In non-stop, "-exec-continue --thread-group"will resume all inferiors if the specified inferior is not executing yet

["marc.khouzam at ericsson dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12736

           Summary: In non-stop, "-exec-continue --thread-group" will
                    resume all inferiors if the specified inferior is not
                    executing yet
           Product: gdb
           Version: 7.2
            Status: NEW
          Severity: minor
          Priority: P2
         Component: mi
        AssignedTo: unassigned@sourceware.org
        ReportedBy: marc.khouzam@ericsson.com


Created attachment 5709
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5709
Proposed fix

If I have an inferior started, and I create a second inferior, MI accepts an
-exec-continue command for the second inferior, even though it wasn't started
yet.  This happens in non-stop mode only.  What GDB/MI does instead is use the
pid 0, which causes all threads to resume, even for other inferiors.  I saw
this in 7.2, 7.3 and HEAD.  Below is a small session showing the problem.

Attached is a proposed fix which adds a check before trying to 'continue' an
inferior that was not started.

> gdb.7.2.1 ~/testing/loopfirst
GNU gdb (GDB) 7.2.0.20110403-cvs
(gdb) set target-async on
(gdb) set non-stop on
(gdb) start
Temporary breakpoint 1 at 0x804850d: file loopfirst.cc, line 5.
Starting program: /home/lmckhou/testing/loopfirst 

Temporary breakpoint 1, main () at loopfirst.cc:5
5           int max = 900;
(gdb) add-inferior -exec /home/lmckhou/testing/loopfirst
Added inferior 2
Reading symbols from /home/lmckhou/testing/loopfirst...done.
(gdb) inf inf
  Num  Description       Executable        
  2    <null>            /home/lmckhou/testing/loopfirst 
* 1    process 9593      /home/lmckhou/testing/loopfirst 
(gdb)  inf thr
* 1 process 9593  main () at loopfirst.cc:5
(gdb)  interpreter-exec mi "-exec-continue --thread-group i2"
^done
(gdb) inf thr
  1 process 9593  (running)

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