Am 02.07.2013 11:36, schrieb Jan Kiszka:
> Objects can soon be referenced/dereference outside the BQL. So we need
> to use atomics in object_ref/unref.
>
> Based on patch by Liu Ping Fan.
>
> Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
> ---
> qom/object.c | 5 ++---
> 1 files changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/qom/object.c b/qom/object.c
> index 803b94b..a76a30b 100644
> --- a/qom/object.c
> +++ b/qom/object.c
> @@ -683,16 +683,15 @@ GSList *object_class_get_list(const char
> *implements_type,
>
> void object_ref(Object *obj)
> {
> - obj->ref++;
> + __sync_fetch_and_add(&obj->ref, 1);
How widespread are these in GCC/clang? Is there any fallback? I remember
seeing some __sync_* warnings on Mac OS X around 4.2...
Andreas
> }
>
> void object_unref(Object *obj)
> {
> g_assert(obj->ref > 0);
> - obj->ref--;
>
> /* parent always holds a reference to its children */
> - if (obj->ref == 0) {
> + if (__sync_sub_and_fetch(&obj->ref, 1) == 0) {
> object_finalize(obj);
> }
> }
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