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qom: Use atomics for object refcounting 

Object reference counts will soon be changed outside the BQL. So we need
to use atomics in object_ref/unref.

Based on a patch by Liu Ping Fan.

Signed-off-by: Liu Ping Fan <qemulist@gmail.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jan Kiszka 2013-07-02 11:36:39 +02:00 committed by Paolo Bonzini
parent 856d72454f
commit f08c03f3c4
1 changed files with 2 additions and 3 deletions
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5
qom/object.c
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@ -683,16 +683,15 @@ GSList *object_class_get_list(const char *implements_type,
void object_ref(Object *obj) void object_ref(Object *obj)
{ {
obj->ref++; atomic_inc(&obj->ref);
} }
void object_unref(Object *obj) void object_unref(Object *obj)
{ {
g_assert(obj->ref > 0); g_assert(obj->ref > 0);
obj->ref--;
/* parent always holds a reference to its children */ /* parent always holds a reference to its children */
if (obj->ref == 0) { if (atomic_fetch_dec(&obj->ref) == 1) {
object_finalize(obj); object_finalize(obj);
} }
} }