[vlc-devel] [PATCH 1/3] os2: implement vlc_once()

[KO Myung-Hun]

Ping ?

KO Myung-Hun wrote:
> 
> Updated.
> 
> Rémi Denis-Courmont wrote:
>> IMU, compare-exchange with comparand equal to assignment value makes no sense, since it's just an over-comlicated load.
>>
>> Le 10 mai 2018 14:41:46 GMT+02:00, KO Myung-Hun <komh78 at gmail.com> a écrit :
>>> ---
>>> include/vlc_threads.h |  6 ++++++
>>> src/os2/thread.c      | 20 ++++++++++++++++++++
>>> 2 files changed, 26 insertions(+)
>>>
>>> diff --git a/include/vlc_threads.h b/include/vlc_threads.h
>>> index 508ddbc001..b0891ac88c 100644
>>> --- a/include/vlc_threads.h
>>> +++ b/include/vlc_threads.h
>>> @@ -125,6 +125,12 @@ typedef struct
>>> #define VLC_STATIC_COND { NULLHANDLE, 0, NULLHANDLE, 0 }
>>> #define LIBVLC_NEED_SEMAPHORE
>>> #define LIBVLC_NEED_RWLOCK
>>> +typedef struct
>>> +{
>>> +    unsigned done;
>>> +    vlc_mutex_t mutex;
>>> +} vlc_once_t;
>>> +#define VLC_STATIC_ONCE { 0, VLC_STATIC_MUTEX }
>>> typedef struct vlc_threadvar *vlc_threadvar_t;
>>> typedef struct vlc_timer *vlc_timer_t;
>>>
>>> diff --git a/src/os2/thread.c b/src/os2/thread.c
>>> index 3b435bfad8..000c3068b3 100644
>>> --- a/src/os2/thread.c
>>> +++ b/src/os2/thread.c
>>> @@ -429,6 +429,26 @@ int vlc_cond_timedwait_daytime (vlc_cond_t
>>> *p_condvar, vlc_mutex_t *p_mutex,
>>>     return vlc_cond_wait_common (p_condvar, p_mutex, ulTimeout);
>>> }
>>>
>>> +void vlc_once(vlc_once_t *once, void (*cb)(void))
>>> +{
>>> +    /* once->done is 0 ? */
>>> +    if( __atomic_cmpxchg32( &once->done, 0, 0 ))
>>> +    {
>>> +        vlc_mutex_lock( &once->mutex );
>>> +
>>> +        /* still once->done is 0 ? */
>>> +        if( __atomic_cmpxchg32( &once->done, 0, 0 ))
>>> +        {
>>> +            cb();
>>> +
>>> +            /* set once->done to 1 */
>>> +            __atomic_xchg( &once->done, 1 );
>>> +        }
>>> +
>>> +        vlc_mutex_unlock( &once->mutex );
>>> +    }
>>> +}
>>> +
>>> /*** Thread-specific variables (TLS) ***/
>>> struct vlc_threadvar
>>> {
>>> -- 
>>> 2.13.3
>>>
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>>
>>
>>
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-- 
KO Myung-Hun

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