[Qemu-devel] [PATCH 06/24] qmp: add qmp_return_is_cancelled()

[Marc-André Lureau]

If the client is gone, no need to return. The async handler can use this
information to avoid unnecessary work and exit earlier.

Signed-off-by: Marc-André Lureau <address@hidden>
---
 qapi/qmp-dispatch.c         | 10 ++++++++++
 include/qapi/qmp/dispatch.h |  8 ++++++++
 2 files changed, 18 insertions(+)

diff --git a/qapi/qmp-dispatch.c b/qapi/qmp-dispatch.c
index c8821b7..0c4022f 100644
--- a/qapi/qmp-dispatch.c
+++ b/qapi/qmp-dispatch.c
@@ -155,6 +155,16 @@ void qmp_return_error(QmpReturn *qret, Error *err)
     do_qmp_return(qret);
 }
 
+bool qmp_return_is_cancelled(QmpReturn *qret)
+{
+    if (!qret->client) {
+        qmp_return_free(qret);
+        return true;
+    }
+
+    return false;
+}
+
 void qmp_client_init(QmpClient *client, QmpDispatchReturn *return_cb)
 {
     client->return_cb = return_cb;
diff --git a/include/qapi/qmp/dispatch.h b/include/qapi/qmp/dispatch.h
index 3287676..bc64d4e 100644
--- a/include/qapi/qmp/dispatch.h
+++ b/include/qapi/qmp/dispatch.h
@@ -78,4 +78,12 @@ void qmp_for_each_command(qmp_cmd_callback_fn fn, void 
*opaque);
 void qmp_return(QmpReturn *qret, QObject *cmd_rsp);
 void qmp_return_error(QmpReturn *qret, Error *err);
 
+/*
+ * qmp_return_is_cancelled:
+ *
+ * Return true if the QmpReturn is cancelled, and free the QmpReturn
+ * in this case.
+ */
+bool qmp_return_is_cancelled(QmpReturn *qret);
+
 #endif
-- 
2.10.0