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infrun: switch to NO_HISTORY thread 

A thread that runs out of its execution history is stopped.  We already set
stop_pc and call stop_waiting.  But we do not switch to the stopped thread.

In normal_stop, we call finish_thread_state_cleanup to set a thread's running
state.  In all-stop mode, we call it with minus_one_ptid; in non-stop mode, we
only call it for inferior_ptid.

If in non-stop mode normal_stop is called on behalf of a thread that is not
inferior_ptid, that other thread will still be reported as running.  If it is
actually stopped it can't be resumed again.

Record targets traditionally don't support non-stop and only resume
inferior_ptid.  So this has not been a problem, so far.

Switch to the eventing thread for NO_HISTORY events as preparation to support
non-stop for the record btrace target.

gdb/
	* infrun.c (handle_inferior_event_1): Switch to the eventing thread
	in the TARKET_WAITKIND_NO_HISTORY case.
This commit is contained in:
Markus Metzger 2015-09-07 10:00:46 +02:00
parent a6b5be76f9
commit d1988021e3
2 changed files with 12 additions and 1 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2015-09-18 Markus Metzger <markus.t.metzger@intel.com>
* infrun.c (handle_inferior_event_1): Switch to the eventing thread
in the TARKET_WAITKIND_NO_HISTORY case.
2015-09-18 Markus Metzger <markus.t.metzger@intel.com>
* record-btrace.c (record_btrace_maybe_mark_async_event): New.

8
gdb/infrun.c
View File

@ -5126,8 +5126,14 @@ Cannot fill $_exitsignal with the correct signal number.\n"));
fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n");
/* Reverse execution: target ran out of history info. */
/* Switch to the stopped thread. */
if (!ptid_equal (ecs->ptid, inferior_ptid))
context_switch (ecs->ptid);
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n");
delete_just_stopped_threads_single_step_breakpoints ();
stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid));
stop_pc = regcache_read_pc (get_thread_regcache (inferior_ptid));
observer_notify_no_history ();
stop_waiting (ecs);
return;