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avcodec/util: use a mutex instead of atomics in avcodec_register()

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Reviewed-by: wm4 <nfxjfg@googlemail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2018-01-04 15:11:31 -03:00
parent 7bb1be9af0
commit 9ed4ebc530
1 changed files with 10 additions and 4 deletions
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14
libavcodec/utils.c
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@ -26,7 +26,6 @@
*/
#include "config.h"
#include "libavutil/atomic.h"
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
@ -127,17 +126,24 @@ int av_codec_is_decoder(const AVCodec *codec)
return codec && (codec->decode || codec->receive_frame);
}
static AVMutex codec_register_mutex = AV_MUTEX_INITIALIZER;
av_cold void avcodec_register(AVCodec *codec)
{
AVCodec **p;
avcodec_init();
p = last_avcodec;
codec->next = NULL;
while(*p || avpriv_atomic_ptr_cas((void * volatile *)p, NULL, codec))
ff_mutex_lock(&codec_register_mutex);
p = last_avcodec;
while (*p)
p = &(*p)->next;
*p = codec;
codec->next = NULL;
last_avcodec = &codec->next;
ff_mutex_unlock(&codec_register_mutex);
if (codec->init_static_data)
codec->init_static_data(codec);
}