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

[Zhao Zhili]

ffmpeg | branch: master | Zhao Zhili <zhilizhao at tencent.com> | Thu Dec  5 17:02:07 2019 +0800| [71fd72070c867b4f442e5c71baab9775c51273dc] | committer: James Almer

avutil/buffer: use appropriate atomic operations

No functional changes. ref/unref vs add/sub is symmetrical.

Signed-off-by: James Almer <jamrial at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=71fd72070c867b4f442e5c71baab9775c51273dc
---

 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);
 }