[libvirt] [PATCH V2] libxl: queue domain event earlier in shutdown handler

[Jim Fehlig]

The shutdown handler may restart a domain when handling a reboot
event or when <on_*> is set to 'restart'.  Restarting consists of
calling libxlVmCleanup followed by libxlVmStart.  libxlVmStart will
emit a VIR_DOMAIN_EVENT_STARTED event, but the SHUTDOWN event is
not emitted until exiting the shutdown handler, after the STARTED
event.

This patch changes the logic a bit to queue the event at the start
of the shutdown action, ensuring it is queued before any subsequent
events that may be generated while executing the shutdown action.

Signed-off-by: Jim Fehlig <jfehlig at suse.com>
---

V2:
Enqueue any pending events at the beginning of the shutdown action
labels, as suggested by Michal Privoznik

https://www.redhat.com/archives/libvir-list/2014-February/msg01446.html

 src/libxl/libxl_driver.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index f7379b5..a79efcb 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -473,6 +473,10 @@ libxlDomainShutdownThread(void *opaque)
     }
 
 destroy:
+    if (dom_event) {
+        libxlDomainEventQueue(driver, dom_event);
+        dom_event = NULL;
+    }
     libxl_domain_destroy(ctx, vm->def->id, NULL);
     if (libxlVmCleanupJob(driver, vm, reason)) {
         if (!vm->persistent) {
@@ -483,6 +487,10 @@ destroy:
     goto cleanup;
 
 restart:
+    if (dom_event) {
+        libxlDomainEventQueue(driver, dom_event);
+        dom_event = NULL;
+    }
     libxl_domain_destroy(ctx, vm->def->id, NULL);
     libxlVmCleanupJob(driver, vm, VIR_DOMAIN_SHUTOFF_SHUTDOWN);
     libxlVmStart(driver, vm, 0, -1);
-- 
1.8.1.4