[PATCH v3 11/19] btrace: async

Markus Metzger
2015-09-17T14:10:22Z

The record btrace target runs synchronous with GDB. That is, GDB steps
resumed threads in record btrace's to_wait method. Without GDB calling
to_wait, nothing happens 'on the target'.

Check for further expected events in to_wait before reporting the current
event and mark record btrace's async event handler in async mode.

2015-09-17 Markus Metzger <markus.t.metzger@intel.com>

gdb/
* record-btrace.c (record_btrace_maybe_mark_async_event): New.
(record_btrace_wait): Call record_btrace_maybe_mark_async_event.
---
gdb/record-btrace.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)

diff --git a/gdb/record-btrace.c b/gdb/record-btrace.c
index 0514471..764b349 100644
--- a/gdb/record-btrace.c
+++ b/gdb/record-btrace.c
@@ -2240,6 +2240,29 @@ record_btrace_step_thread (struct thread_info *tp)
typedef struct thread_info * tp_t;
DEF_VEC_P (tp_t);

+/* Announce further events if necessary. */
+
+static void
+record_btrace_maybe_mark_async_event (const VEC (tp_t) *moving,
+ const VEC (tp_t) *no_history)
+{
+ int more_moving, more_no_history;
+
+ more_moving = !VEC_empty (tp_t, moving);
+ more_no_history = !VEC_empty (tp_t, no_history);
+
+ if (!more_moving && !more_no_history)
+ return;
+
+ if (more_moving)
+ DEBUG ("movers pending");
+
+ if (more_no_history)
+ DEBUG ("no-history pending");
+
+ mark_async_event_handler (record_btrace_async_inferior_event_handler);
+}
+
/* The to_wait method of target record-btrace. */

static ptid_t
@@ -2355,6 +2378,10 @@ record_btrace_wait (struct target_ops *ops, ptid_t ptid,
ALL_NON_EXITED_THREADS (tp)
record_btrace_cancel_resume (tp);

+ /* In async mode, we need to announce further events. */
+ if (target_is_async_p ())
+ record_btrace_maybe_mark_async_event (moving, no_history);
+
/* Start record histories anew from the current position. */
record_btrace_clear_histories (&eventing->btrace);

--
1.8.3.1