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

[KO Myung-Hun]

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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