[PATCH V2 3/4] qapi: Add attached flag for iothread

[Zhang Chen <zhangckid@gmail.com>]

The attached flag depends on struct IOThreadInfo's
'attached': 'bool'. It can show whether the iothread
is attached to an actual device. Show in the qmp/hmp
CMD with "attached": true/false.

Signed-off-by: Zhang Chen <zhangckid@gmail.com>
---
 iothread.c         | 1 +
 monitor/hmp-cmds.c | 2 ++
 qapi/misc.json     | 6 ++++++
 3 files changed, 9 insertions(+)

diff --git a/iothread.c b/iothread.c
index 38e38fb44d..fb4898e491 100644
--- a/iothread.c
+++ b/iothread.c
@@ -358,6 +358,7 @@ static int query_one_iothread(Object *object, void *opaque)
     info = g_new0(IOThreadInfo, 1);
     info->id = iothread_get_id(iothread);
     info->thread_id = iothread->thread_id;
+    info->attached = iothread->attached;
     info->poll_max_ns = iothread->poll_max_ns;
     info->poll_grow = iothread->poll_grow;
     info->poll_shrink = iothread->poll_shrink;
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index 5a673cddb2..7463f34bf5 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -202,6 +202,8 @@ void hmp_info_iothreads(Monitor *mon, const QDict *qdict)
         value = info->value;
         monitor_printf(mon, "%s:\n", value->id);
         monitor_printf(mon, "  thread_id=%" PRId64 "\n", value->thread_id);
+        monitor_printf(mon, "  attached=%s" "\n",
+                       value->attached ? "true" : "false");
         monitor_printf(mon, "  poll-max-ns=%" PRId64 "\n", value->poll_max_ns);
         monitor_printf(mon, "  poll-grow=%" PRId64 "\n", value->poll_grow);
         monitor_printf(mon, "  poll-shrink=%" PRId64 "\n", value->poll_shrink);
diff --git a/qapi/misc.json b/qapi/misc.json
index e87994c9d9..99ffd45ce5 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -76,6 +76,9 @@
 #
 # @thread-id: ID of the underlying host thread
 #
+# @attached: flag to show current iothread attach to device status
+#     (since 12.0)
+#
 # @poll-max-ns: maximum polling time in ns, 0 means polling is
 #     disabled (since 2.9)
 #
@@ -93,6 +96,7 @@
 { 'struct': 'IOThreadInfo',
   'data': {'id': 'str',
            'thread-id': 'int',
+           'attached': 'bool',
            'poll-max-ns': 'int',
            'poll-grow': 'int',
            'poll-shrink': 'int',
@@ -118,6 +122,7 @@
 #              {
 #                 "id":"iothread0",
 #                 "thread-id":3134,
+#                 "attached":false",
 #                 'poll-max-ns':32768,
 #                 "poll-grow":0,
 #                 "poll-shrink":0,
@@ -126,6 +131,7 @@
 #              {
 #                 "id":"iothread1",
 #                 "thread-id":3135,
+#                 "attached":true",
 #                 'poll-max-ns':32768,
 #                 "poll-grow":0,
 #                 "poll-shrink":0,
-- 
2.49.0