On Wed, Jul 25, 2012 at 5:08 PM, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:
> Il 25/07/2012 05:31, Liu Ping Fan ha scritto:
>> From: Liu Ping Fan <pingfank@xxxxxxxxxxxxxxxxxx>
>>
>> rwlock:
>> qemu_device_tree_mutex
>>
>> rd side:
>> --device_del(destruction of device will be postphoned until unplug
>> ack from guest),
>> --pci hot-unplug
>> --iteration (qdev_reset_all)
>>
>> wr side:
>> --device_add
>>
>> Signed-off-by: Liu Ping Fan <pingfank@xxxxxxxxxxxxxxxxxx>
>> ---
>> hw/pci-hotplug.c | 4 ++++
>> hw/qdev-monitor.c | 17 ++++++++++++++++-
>> hw/qdev.c | 2 ++
>> 3 files changed, 22 insertions(+), 1 deletions(-)
>>
>> diff --git a/hw/pci-hotplug.c b/hw/pci-hotplug.c
>> index e7fb780..b3b88c1 100644
>> --- a/hw/pci-hotplug.c
>> +++ b/hw/pci-hotplug.c
>> @@ -265,9 +265,11 @@ static int pci_device_hot_remove(Monitor *mon, const char *pci_addr)
>> return -1;
>> }
>>
>> + qemu_rwlock_rdlock_devtree();
>
> This is not defined anywhere, is a piece missing in the patch?
>
Oh, yes, I miss the patch. In that patch, these rwlock are just place holder.
I see there is already try to implement rwlock for qemu.
http://lists.gnu.org/archive/html/qemu-devel/2011-10/msg00192.html
and is it the time for introduce rwlock for qemu?
Thanks,
pingfan
> Paolo
>
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