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

[KO Myung-Hun]

Thanks!

Thomas Guillem wrote:
> Ah yes, just merged.
> 
> On Fri, May 18, 2018, at 11:23, KO Myung-Hun wrote:
>> 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
>>
>> Using Mozilla SeaMonkey 2.7.2
>> Under OS/2 Warp 4 for Korean with FixPak #15
>> In VirtualBox v4.1.32 on Intel Core i7-3615QM 2.30GHz with 8GB RAM
>>
>> Korean OS/2 User Community : http://www.os2.kr/
>>
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-- 
KO Myung-Hun

Using Mozilla SeaMonkey 2.7.2
Under OS/2 Warp 4 for Korean with FixPak #15
In VirtualBox v4.1.32 on Intel Core i7-3615QM 2.30GHz with 8GB RAM

Korean OS/2 User Community : http://www.os2.kr/