[PATCH v2] [gdb/dap] Add thread exited event

[Simon Farre <simon.farre.cx@gmail.com>]

Reports a thread exit according to the DAP spec:
https://microsoft.github.io/debug-adapter-protocol/specification#Events_Thread

This patch requires the ThreadExitedEvent to be checked in,
in order to work. That patch is found here https://sourceware.org/pipermail/gdb-patches/2023-June/200071.html

Formatted correctly using black

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30474
---
 gdb/python/lib/gdb/dap/events.py | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/gdb/python/lib/gdb/dap/events.py b/gdb/python/lib/gdb/dap/events.py
index d9ae603dfa4..19838756c74 100644
--- a/gdb/python/lib/gdb/dap/events.py
+++ b/gdb/python/lib/gdb/dap/events.py
@@ -68,16 +68,26 @@ def _bp_deleted(event):
 
 
 @in_gdb_thread
-def _new_thread(event):
+def thread_event(event, reason):
     send_event(
         "thread",
         {
-            "reason": "started",
+            "reason": reason,
             "threadId": event.inferior_thread.global_num,
         },
     )
 
 
+@in_gdb_thread
+def _new_thread(event):
+    thread_event(event, "started")
+
+
+@in_gdb_thread
+def _thread_exited(event):
+    thread_event(event, "exited")
+
+
 _suppress_cont = False
 
 
@@ -160,4 +170,5 @@ gdb.events.breakpoint_created.connect(_bp_created)
 gdb.events.breakpoint_modified.connect(_bp_modified)
 gdb.events.breakpoint_deleted.connect(_bp_deleted)
 gdb.events.new_thread.connect(_new_thread)
+gdb.events.thread_exited.connect(_thread_exited)
 gdb.events.cont.connect(_cont)
-- 
2.41.0