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avformat: make av_register_*put_format() thread safe

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-06-29 03:44:15 +02:00
parent b36b5edb8f
commit 53fd1ab26b
1 changed files with 5 additions and 8 deletions
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13
libavformat/format.c
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@ -21,6 +21,7 @@
#include "avformat.h" #include "avformat.h"
#include "internal.h" #include "internal.h"
#include "libavutil/atomic.h"
#include "libavutil/avstring.h" #include "libavutil/avstring.h"
/** /**
@ -52,22 +53,18 @@ void av_register_input_format(AVInputFormat *format)
{ {
AVInputFormat **p = &first_iformat; AVInputFormat **p = &first_iformat;
while (*p != NULL)
p = &(*p)->next;
*p = format;
format->next = NULL; format->next = NULL;
while(avpriv_atomic_ptr_cas((void * volatile *)p, NULL, format))
p = &(*p)->next;
} }
void av_register_output_format(AVOutputFormat *format) void av_register_output_format(AVOutputFormat *format)
{ {
AVOutputFormat **p = &first_oformat; AVOutputFormat **p = &first_oformat;
while (*p != NULL)
p = &(*p)->next;
*p = format;
format->next = NULL; format->next = NULL;
while(avpriv_atomic_ptr_cas((void * volatile *)p, NULL, format))
p = &(*p)->next;
} }
int av_match_ext(const char *filename, const char *extensions) int av_match_ext(const char *filename, const char *extensions)