[PATCH] Have gdb.ThreadExitedEvent inherit from gdb.ThreadEvent

[Tom Tromey <tromey@adacore.com>]

The documentation says that ThreadExitedEvent is derived from
ThreadEvent, but the code does not actually implement this.

This patch fixes the problem.  I propose applying this to gdb 17 as
well.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=33444
---
 gdb/python/py-event-types.def                | 2 +-
 gdb/testsuite/gdb.python/py-thread-exited.py | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/gdb/python/py-event-types.def b/gdb/python/py-event-types.def
index 15cd9faae69..83167f36163 100644
--- a/gdb/python/py-event-types.def
+++ b/gdb/python/py-event-types.def
@@ -54,7 +54,7 @@ GDB_PY_DEFINE_EVENT_TYPE (new_thread,
 GDB_PY_DEFINE_EVENT_TYPE (thread_exited,
 			  "ThreadExitedEvent",
 			  "GDB thread exited event object",
-			  event_object_type);
+			  thread_event_object_type);
 
 GDB_PY_DEFINE_EVENT_TYPE (new_inferior,
 			  "NewInferiorEvent",
diff --git a/gdb/testsuite/gdb.python/py-thread-exited.py b/gdb/testsuite/gdb.python/py-thread-exited.py
index ef5a2441b8e..f725bd585c9 100644
--- a/gdb/testsuite/gdb.python/py-thread-exited.py
+++ b/gdb/testsuite/gdb.python/py-thread-exited.py
@@ -26,6 +26,8 @@ def thread_exited_handler(event):
     global threadOneExit, threadTwoExit, mainThreadExit
     print("{}".format(event))
     assert isinstance(event, gdb.ThreadExitedEvent)
+    # Also check the inheritance.
+    assert isinstance(event, gdb.ThreadEvent)
     if threadOneExit == "":
         threadOneExit = "event type: thread-exited. global num: {}".format(
             event.inferior_thread.global_num

base-commit: 311378bc3b871b199f439152c39debb7ec02e21c
-- 
2.51.0