RE: [PATCH v5 4/4] gdb, infrun: fix multi-threaded reverse stepping

["Metzger, Markus T" <markus.t.metzger@intel.com>]

>> @@ -179,6 +186,9 @@ struct thread_control_state
>>
>>     /* Whether the thread was replaying when the command was issued.  */
>>     bool is_replaying = false;
>> +
>> +  /* The execution direction when the command was issued.  */
>> +  enum exec_direction_kind execution_direction = EXEC_FORWARD;
>
>I'm a bit unsure of this... Mostly wondering if this makes sense to be a
>thread-specific information. Does it make sense for one thread to have a
>direction being forward and another backwards? I would think this is not
>a good idea (if not impossible).

You can have one thread going forward and the other going backward.
Both are replaying; we do not allow recording one thread while another
thread in the same inferior is replaying.

Regards,
Markus.
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