return event_ptid;
}
-/* Returns true if INF has any resumed thread with a status
- pending. */
-
-static bool
-threads_are_resumed_pending_p (inferior *inf)
-{
- for (thread_info *tp : inf->non_exited_threads ())
- if (tp->resumed
- && tp->suspend.waitstatus_pending_p)
- return true;
-
- return false;
-}
-
/* Wrapper for target_wait that first checks whether threads have
pending statuses to report before actually asking the target for
- more events. Polls for events from all inferiors/targets. */
+ more events. Polls for events from all inferiors/targets. */
static bool
do_target_wait (ptid_t wait_ptid, execution_control_state *ecs, int options)
int num_inferiors = 0;
int random_selector;
- /* For fairness, we pick the first inferior/target to poll at
- random, and then continue polling the rest of the inferior list
- starting from that one in a circular fashion until the whole list
- is polled once. */
+ /* For fairness, we pick the first inferior/target to poll at random
+ out of all inferiors that may report events, and then continue
+ polling the rest of the inferior list starting from that one in a
+ circular fashion until the whole list is polled once. */
auto inferior_matches = [&wait_ptid] (inferior *inf)
{
return (inf->process_target () != NULL
- && (threads_are_executing (inf->process_target ())
- || threads_are_resumed_pending_p (inf))
&& ptid_t (inf->pid).matches (wait_ptid));
};
- /* First see how many resumed inferiors we have. */
+ /* First see how many matching inferiors we have. */
for (inferior *inf : all_inferiors ())
if (inferior_matches (inf))
num_inferiors++;
return false;
}
- /* Now randomly pick an inferior out of those that were resumed. */
+ /* Now randomly pick an inferior out of those that matched. */
random_selector = (int)
((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0));
"infrun: Found %d inferiors, starting at #%d\n",
num_inferiors, random_selector);
- /* Select the Nth inferior that was resumed. */
+ /* Select the Nth inferior that matched. */
inferior *selected = nullptr;
break;
}
- /* Now poll for events out of each of the resumed inferior's
+ /* Now poll for events out of each of the matching inferior's
targets, starting from the selected one. */
auto do_wait = [&] (inferior *inf)
return (ecs->ws.kind != TARGET_WAITKIND_IGNORE);
};
- /* Needed in all-stop+target-non-stop mode, because we end up here
- spuriously after the target is all stopped and we've already
+ /* Needed in 'all-stop + target-non-stop' mode, because we end up
+ here spuriously after the target is all stopped and we've already
reported the stop to the user, polling for events. */
scoped_restore_current_thread restore_thread;
have resumed threads _now_. In the example above, this removes
thread 3 from the thread list. If thread 2 was re-resumed, we
ignore this event. If we find no thread resumed, then we cancel
- the synchronous command show "no unwaited-for " to the user. */
- update_thread_list ();
+ the synchronous command and show "no unwaited-for " to the
+ user. */
+
+ inferior *curr_inf = current_inferior ();
+
+ scoped_restore_current_thread restore_thread;
+
+ for (auto *target : all_non_exited_process_targets ())
+ {
+ switch_to_target_no_thread (target);
+ update_thread_list ();
+ }
+
+ /* If:
+
+ - the current target has no thread executing, and
+ - the current inferior is native, and
+ - the current inferior is the one which has the terminal, and
+ - we did nothing,
+
+ then a Ctrl-C from this point on would remain stuck in the
+ kernel, until a thread resumes and dequeues it. That would
+ result in the GDB CLI not reacting to Ctrl-C, not able to
+ interrupt the program. To address this, if the current inferior
+ no longer has any thread executing, we give the terminal to some
+ other inferior that has at least one thread executing. */
+ bool swap_terminal = true;
- for (thread_info *thread : all_non_exited_threads (ecs->target))
+ /* Whether to ignore this TARGET_WAITKIND_NO_RESUMED event, or
+ whether to report it to the user. */
+ bool ignore_event = false;
+
+ for (thread_info *thread : all_non_exited_threads ())
{
- if (thread->executing
- || thread->suspend.waitstatus_pending_p)
+ if (swap_terminal && thread->executing)
{
- /* There were no unwaited-for children left in the target at
- some point, but there are now. Just ignore. */
+ if (thread->inf != curr_inf)
+ {
+ target_terminal::ours ();
+
+ switch_to_thread (thread);
+ target_terminal::inferior ();
+ }
+ swap_terminal = false;
+ }
+
+ if (!ignore_event
+ && (thread->executing
+ || thread->suspend.waitstatus_pending_p))
+ {
+ /* Either there were no unwaited-for children left in the
+ target at some point, but there are now, or some target
+ other than the eventing one has unwaited-for children
+ left. Just ignore. */
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: TARGET_WAITKIND_NO_RESUMED "
"(ignoring: found resumed)\n");
- prepare_to_wait (ecs);
- return 1;
+
+ ignore_event = true;
}
+
+ if (ignore_event && !swap_terminal)
+ break;
+ }
+
+ if (ignore_event)
+ {
+ switch_to_inferior_no_thread (curr_inf);
+ prepare_to_wait (ecs);
+ return 1;
}
/* Go ahead and report the event. */
ecs->wait_some_more = 1;
- if (!target_is_async_p ())
+ /* If the target can't async, emulate it by marking the infrun event
+ handler such that as soon as we get back to the event-loop, we
+ immediately end up in fetch_inferior_event again calling
+ target_wait. */
+ if (!target_can_async_p ())
mark_infrun_async_event_handler ();
}
annotate_signal_string ();
uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal));
+ struct regcache *regcache = get_current_regcache ();
+ struct gdbarch *gdbarch = regcache->arch ();
+ if (gdbarch_report_signal_info_p (gdbarch))
+ gdbarch_report_signal_info (gdbarch, uiout, siggnal);
+
if (siggnal == GDB_SIGNAL_SEGV)
handle_segmentation_fault (uiout);
projects / deliverable / binutils-gdb.git / blobdiff