From b36b5edb8fea33ebcacc0b77ce412372dd9f79e4 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 29 Jun 2013 03:39:03 +0200 Subject: [PATCH] avcodec/bitstream_filter: make av_register_bitstream_filter() thread safe Signed-off-by: Michael Niedermayer --- libavcodec/bitstream_filter.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/libavcodec/bitstream_filter.c b/libavcodec/bitstream_filter.c index 328a9f6a34..dd105316ee 100644 --- a/libavcodec/bitstream_filter.c +++ b/libavcodec/bitstream_filter.c @@ -21,6 +21,7 @@ #include #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){