On Wed, Aug 8, 2012 at 5:41 PM, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:
> Il 08/08/2012 08:25, Liu Ping Fan ha scritto:
>> From: Liu Ping Fan <pingfank@xxxxxxxxxxxxxxxxxx>
>>
>> Signed-off-by: Liu Ping Fan <pingfank@xxxxxxxxxxxxxxxxxx>
>> ---
>> cpus.c | 12 ++++++++++++
>> main-loop.h | 3 +++
>> 2 files changed, 15 insertions(+), 0 deletions(-)
>>
>> diff --git a/cpus.c b/cpus.c
>> index b182b3d..a734b36 100644
>> --- a/cpus.c
>> +++ b/cpus.c
>> @@ -611,6 +611,7 @@ static void qemu_tcg_init_cpu_signals(void)
>> }
>> #endif /* _WIN32 */
>>
>> +QemuMutex qemu_device_tree_mutex;
>> QemuMutex qemu_global_mutex;
>> static QemuCond qemu_io_proceeded_cond;
>> static bool iothread_requesting_mutex;
>> @@ -634,6 +635,7 @@ void qemu_init_cpu_loop(void)
>> qemu_cond_init(&qemu_work_cond);
>> qemu_cond_init(&qemu_io_proceeded_cond);
>> qemu_mutex_init(&qemu_global_mutex);
>> + qemu_mutex_init(&qemu_device_tree_mutex);
>>
>> qemu_thread_get_self(&io_thread);
>> }
>> @@ -911,6 +913,16 @@ void qemu_mutex_unlock_iothread(void)
>> qemu_mutex_unlock(&qemu_global_mutex);
>> }
>>
>> +void qemu_lock_devtree(void)
>> +{
>> + qemu_mutex_lock(&qemu_device_tree_mutex);
>> +}
>> +
>> +void qemu_unlock_devtree(void)
>> +{
>> + qemu_mutex_unlock(&qemu_device_tree_mutex);
>> +}
>
> We don't need the wrappers. They are there for the big lock just
> because TCG needs extra work for iothread_requesting_mutex.
>
Sorry, could you give more detail about TCG, what is extra work.
Thanks,
pingfan
> Paolo
>
>> static int all_vcpus_paused(void)
>> {
>> CPUArchState *penv = first_cpu;
>> diff --git a/main-loop.h b/main-loop.h
>> index dce1cd9..17e959a 100644
>> --- a/main-loop.h
>> +++ b/main-loop.h
>> @@ -353,6 +353,9 @@ void qemu_mutex_lock_iothread(void);
>> */
>> void qemu_mutex_unlock_iothread(void);
>>
>> +void qemu_lock_devtree(void);
>> +void qemu_unlock_devtree(void);
>> +
>> /* internal interfaces */
>>
>> void qemu_fd_register(int fd);
>>
>
>
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