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Re: [Qemu-devel] [PATCH] qom: Use atomics for object refcounting
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH] qom: Use atomics for object refcounting |
Date: |
Tue, 02 Jul 2013 17:33:41 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6 |
Il 02/07/2013 16:47, Anthony Liguori ha scritto:
> Jan Kiszka <address@hidden> writes:
>
>> 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 <address@hidden>
>> ---
>> 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);
>> }
>>
>> 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);
>> }
>> }
>
> Should we introduce something akin to kref now that referencing counting
> has gotten fancy?
I'm not a big fan of kref (it seems _too_ thin a wrapper to me, i.e. it
doesn't really wrap enough to be useful), but I wouldn't oppose it if
someone else does it.
Paolo
Re: [Qemu-devel] [PATCH] qom: Use atomics for object refcounting, Anthony Liguori, 2013/07/02
- Re: [Qemu-devel] [PATCH] qom: Use atomics for object refcounting,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCH] qom: Use atomics for object refcounting, Anthony Liguori, 2013/07/02
- Re: [Qemu-devel] [PATCH] qom: Use atomics for object refcounting, liu ping fan, 2013/07/02
- Re: [Qemu-devel] [PATCH] qom: Use atomics for object refcounting, Andreas Färber, 2013/07/03
- Re: [Qemu-devel] [PATCH] qom: Use atomics for object refcounting, liu ping fan, 2013/07/04
- Re: [Qemu-devel] [PATCH] qom: Use atomics for object refcounting, Andreas Färber, 2013/07/04
- Re: [Qemu-devel] [PATCH] qom: Use atomics for object refcounting, liu ping fan, 2013/07/04
Re: [Qemu-devel] [PATCH] qom: Use atomics for object refcounting, Paolo Bonzini, 2013/07/04