[Qemu-devel] [PATCH v6 2/8] qom: apply atomic on object's refcount

[Liu Ping Fan <qemulist@gmail.com>]

From: Liu Ping Fan <pingfank@linux.vnet.ibm.com>

Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
---
 include/qemu/object.h |    3 ++-
 qom/object.c          |   11 +++++------
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/qemu/object.h b/include/qemu/object.h
index cc75fee..0c02614 100644
--- a/include/qemu/object.h
+++ b/include/qemu/object.h
@@ -18,6 +18,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include "qemu-queue.h"
+#include "qemu/atomic.h"
 
 struct Visitor;
 struct Error;
@@ -262,7 +263,7 @@ struct Object
     /*< private >*/
     ObjectClass *class;
     QTAILQ_HEAD(, ObjectProperty) properties;
-    uint32_t ref;
+    Atomic ref;
     Object *parent;
 };
 
diff --git a/qom/object.c b/qom/object.c
index e3e9242..34ec2a1 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -383,7 +383,7 @@ void object_finalize(void *data)
     object_deinit(obj, ti);
     object_property_del_all(obj);
 
-    g_assert(obj->ref == 0);
+    g_assert(atomic_read(&obj->ref) == 0);
 }
 
 Object *object_new_with_type(Type type)
@@ -410,7 +410,7 @@ Object *object_new(const char *typename)
 void object_delete(Object *obj)
 {
     object_unparent(obj);
-    g_assert(obj->ref == 1);
+    g_assert(atomic_read(&obj->ref) == 1);
     object_unref(obj);
     g_free(obj);
 }
@@ -600,16 +600,15 @@ GSList *object_class_get_list(const char *implements_type,
 
 void object_ref(Object *obj)
 {
-    obj->ref++;
+    atomic_inc(&obj->ref);
 }
 
 void object_unref(Object *obj)
 {
-    g_assert(obj->ref > 0);
-    obj->ref--;
+    g_assert(atomic_read(&obj->ref) > 0);
 
     /* parent always holds a reference to its children */
-    if (obj->ref == 0) {
+    if (atomic_return_and_sub(1, &obj->ref) == 1) {
         object_finalize(obj);
     }
 }
-- 
1.7.4.4