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

[Thomas Guillem]

OK for me.

On Thu, May 10, 2018, at 14:41, KO Myung-Hun wrote:
> ---
>  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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