[vlc-devel] [PATCH v2 2/2] os2: implement vlc_once()

[KO Myung-Hun]

Ping ?

KO Myung-Hun wrote:
> ---
>  include/vlc_threads.h |  6 ++++++
>  src/os2/thread.c      | 18 ++++++++++++++++++
>  2 files changed, 24 insertions(+)
> 
> diff --git a/include/vlc_threads.h b/include/vlc_threads.h
> index 37054a3ded..b7505da266 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 3ecf24dc0d..9f64fcc3b3 100644
> --- a/src/os2/thread.c
> +++ b/src/os2/thread.c
> @@ -38,6 +38,7 @@
>  #include <limits.h>
>  #include <errno.h>
>  #include <time.h>
> +#include <stdatomic.h>
>  
>  #include <sys/types.h>
>  #ifdef HAVE_SYS_SOCKET_H
> @@ -429,6 +430,23 @@ 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))
> +{
> +    if( atomic_load_explicit( &once->done, memory_order_acquire ) == 0 )
> +    {
> +        vlc_mutex_lock( &once->mutex );
> +
> +        if( atomic_load_explicit( &once->done, memory_order_acquire ) == 0 )
> +        {
> +            cb();
> +
> +            atomic_store_explicit( &once->done, 1, memory_order_release );
> +        }
> +
> +        vlc_mutex_unlock( &once->mutex );
> +    }
> +}
> +
>  /*** Thread-specific variables (TLS) ***/
>  struct vlc_threadvar
>  {

-- 
KO Myung-Hun

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