[PATCH v4 24/44] gdb: allow resuming an inferior with no threads

When resuming an inferior without threads and schedule-multiple, we may
end up resuming threads of other inferiors in all-stop mode.  Clear their
proceed status so we do not report the same event again.

Also, simplify clear_proceed_status () by collapsing the all-stop and
non-stop cases.  In non-stop, user_visible_resume_ptid () returns
inferior_ptid, so iterating over all non-exited threads matching that ptid
in all-stop mode matches calling clear_proceed_status_thread () for
inferior_thread () in non-stop mode.
---
 gdb/infrun.c | 39 ++++++++++++++++++---------------------
 1 file changed, 18 insertions(+), 21 deletions(-)

diff --git a/gdb/infrun.c b/gdb/infrun.c
index c0767e7f764..ce7c376af14 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -3173,32 +3173,29 @@ clear_proceed_status (int step, bool about_to_proceed)
       && !target_record_will_replay (inferior_ptid, execution_direction))
     target_record_stop_replaying ();
 
-  if (!non_stop && inferior_ptid != null_ptid)
-    {
-      ptid_t resume_ptid = user_visible_resume_ptid (step);
-      process_stratum_target *resume_target
-	= user_visible_resume_target (resume_ptid);
+  ptid_t resume_ptid = user_visible_resume_ptid (step);
+  process_stratum_target *resume_target
+    = user_visible_resume_target (resume_ptid);
 
-      /* In all-stop mode, delete the per-thread status of all threads
-	 we're about to resume, implicitly and explicitly.  */
-      for (thread_info &tp : all_non_exited_threads (resume_target, resume_ptid))
-	if (tp.internal_state () != THREAD_INT_RUNNING)
-	  clear_proceed_status_thread (&tp);
-    }
+  if (resume_ptid == null_ptid)
+    return;
 
-  if (inferior_ptid != null_ptid)
+  /* Delete the per-thread status of all threads we're about to resume,
+     implicitly and explicitly.  */
+  for (thread_info &tp : all_non_exited_threads (resume_target, resume_ptid))
+    if (tp.internal_state () != THREAD_INT_RUNNING)
+      clear_proceed_status_thread (&tp);
+
+  for (inferior *inf : all_non_exited_inferiors (resume_target))
     {
-      struct inferior *inferior;
+      if (!inf->has_execution ())
+	continue;
 
-      if (non_stop)
-	{
-	  /* If in non-stop mode, only delete the per-thread status of
-	     the current thread.  */
-	  clear_proceed_status_thread (inferior_thread ());
-	}
+      ptid_t ptid { inf->pid };
+      if (!ptid.matches (resume_ptid))
+	continue;
 
-      inferior = current_inferior ();
-      inferior->control.stop_soon = NO_STOP_QUIETLY;
+      inf->control.stop_soon = NO_STOP_QUIETLY;
     }
 
   if (about_to_proceed)
-- 
2.43.0

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