[Bug python/12967] New: event.inferior_thread does not exist inall-stop/sync mode

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12967

           Summary: event.inferior_thread does not exist in all-stop/sync
                    mode
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jan.kratochvil@redhat.com
                CC: pmuldoon@redhat.com
              Host: x86_64-fedora15-linux-gnu
            Target: x86_64-fedora15-linux-gnu


When I remove
gdb_test_no_output "set non-stop on"
gdb_test_no_output "set target-async on"

from gdb.python/py-evsignal.exp and gdb.python/py-evthreads.exp they will FAIL
because

event type: stop
stop reason: signal
stop signal: SIGUSR1
thread num: 3
event type: stop
(gdb) PASS: gdb.python/py-evsignal.exp: thread 3 was signaled

->

event type: stop
stop reason: signal
stop signal: SIGUSR1
event type: stop
(gdb) FAIL: gdb.python/py-evsignal.exp: Signal Thread 3

that means that event.inferior_thread does not exist; because:
        if ( event.inferior_thread is not None) :
            print "thread num: %s" % (event.inferior_thread.num);

But I do not see why event.inferior_thread would not exist in all-stop/sync
mode, it should not be related.

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