[FFmpeg-devel] [PATCH] avutil/buffer: use appropriate atomic operations

[James Almer]

On 12/5/2019 6:02 AM, quinkblack at foxmail.com wrote:
> From: Zhao Zhili <zhilizhao at tencent.com>
> 
> No functional changes. ref/unref vs add/sub is symmetrical.
> ---
>  libavutil/buffer.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/libavutil/buffer.c b/libavutil/buffer.c
> index 8d1aa5fa84..f0034b026a 100644
> --- a/libavutil/buffer.c
> +++ b/libavutil/buffer.c
> @@ -116,7 +116,7 @@ static void buffer_replace(AVBufferRef **dst, AVBufferRef **src)
>      } else
>          av_freep(dst);
>  
> -    if (atomic_fetch_add_explicit(&b->refcount, -1, memory_order_acq_rel) == 1) {
> +    if (atomic_fetch_sub_explicit(&b->refcount, 1, memory_order_acq_rel) == 1) {
>          b->free(b->opaque, b->data);
>          av_freep(&b);
>      }
> @@ -281,7 +281,7 @@ void av_buffer_pool_uninit(AVBufferPool **ppool)
>      pool   = *ppool;
>      *ppool = NULL;
>  
> -    if (atomic_fetch_add_explicit(&pool->refcount, -1, memory_order_acq_rel) == 1)
> +    if (atomic_fetch_sub_explicit(&pool->refcount, 1, memory_order_acq_rel) == 1)
>          buffer_pool_free(pool);
>  }
>  
> @@ -298,7 +298,7 @@ static void pool_release_buffer(void *opaque, uint8_t *data)
>      pool->pool = buf;
>      ff_mutex_unlock(&pool->mutex);
>  
> -    if (atomic_fetch_add_explicit(&pool->refcount, -1, memory_order_acq_rel) == 1)
> +    if (atomic_fetch_sub_explicit(&pool->refcount, 1, memory_order_acq_rel) == 1)
>          buffer_pool_free(pool);
>  }

Applied, thanks.