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avcodec/bitstream_filter: make av_register_bitstream_filter() thread safe

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-06-29 03:39:03 +02:00
parent 08f6fdc3e4
commit b36b5edb8f
1 changed files with 4 additions and 2 deletions
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6
libavcodec/bitstream_filter.c
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@ -21,6 +21,7 @@
#include <string.h>
#include "avcodec.h"
#include "libavutil/atomic.h"
#include "libavutil/mem.h"
static AVBitStreamFilter *first_bitstream_filter= NULL;
@ -31,8 +32,9 @@ AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f){
}
void av_register_bitstream_filter(AVBitStreamFilter *bsf){
bsf->next = first_bitstream_filter;
first_bitstream_filter= bsf;
do {
bsf->next = first_bitstream_filter;
} while(bsf->next != avpriv_atomic_ptr_cas((void * volatile *)&first_bitstream_filter, bsf->next, bsf));
}
AVBitStreamFilterContext *av_bitstream_filter_init(const char *name){