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avutil/get_pool: Remove redundant initial atomic operation 

602->442 dezicycles

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-03-17 16:37:06 +01:00
parent 9cde9f70ab
commit e3be7b1159
1 changed files with 3 additions and 3 deletions
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6
libavutil/buffer.c
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@ -239,14 +239,14 @@ void av_buffer_pool_uninit(AVBufferPool **ppool)
/* remove the whole buffer list from the pool and return it */ /* remove the whole buffer list from the pool and return it */
static BufferPoolEntry *get_pool(AVBufferPool *pool) static BufferPoolEntry *get_pool(AVBufferPool *pool)
{ {
BufferPoolEntry *cur = NULL, *last = NULL; BufferPoolEntry *cur = *(void * volatile *)&pool->pool, *last = NULL;
do { while (cur != last) {
FFSWAP(BufferPoolEntry*, cur, last); FFSWAP(BufferPoolEntry*, cur, last);
cur = avpriv_atomic_ptr_cas((void * volatile *)&pool->pool, last, NULL); cur = avpriv_atomic_ptr_cas((void * volatile *)&pool->pool, last, NULL);
if (!cur) if (!cur)
return NULL; return NULL;
} while (cur != last); }
return cur; return cur;
} }