Re: [FFmpeg-devel] [PATCH 24/42] avcodec/refstruct: Allow to share pools

[Anton Khirnov <anton@khirnov.net>]

Quoting Andreas Rheinhardt (2023-09-19 21:57:16)
> To do this, make FFRefStructPool itself refcounted according
> to the RefStruct API.
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
>  libavcodec/refstruct.c | 29 ++++++++++++++++-------------
>  libavcodec/refstruct.h |  5 ++++-
>  2 files changed, 20 insertions(+), 14 deletions(-)
> 
> diff --git a/libavcodec/refstruct.c b/libavcodec/refstruct.c
> index f8d040874d..2108ff8163 100644
> --- a/libavcodec/refstruct.c
> +++ b/libavcodec/refstruct.c
> @@ -187,7 +187,7 @@ static void pool_free(FFRefStructPool *pool)
>      pthread_mutex_destroy(&pool->mutex);
>      if (pool->free_cb)
>          pool->free_cb(pool->opaque);
> -    av_free(pool);
> +    av_free(get_refcount(pool));
>  }
>  
>  static void pool_free_entry(FFRefStructPool *pool, RefCount *ref)
> @@ -278,13 +278,17 @@ void *ff_refstruct_pool_get(FFRefStructPool *pool)
>      return ret;
>  }
>  
> -void ff_refstruct_pool_uninit(FFRefStructPool **poolp)
> +static void pool_unref(void *ref)
>  {
> -    FFRefStructPool *pool = *poolp;
> -    RefCount *entry;
> +    FFRefStructPool *pool = get_userdata(ref);
> +    if (atomic_fetch_sub_explicit(&pool->refcount, 1, memory_order_acq_rel) == 1)

Is there a reason you cannot fold pool->refcount into the pool's
containing RefStruct?

-- 
Anton Khirnov
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