diff options
| author | Michael Niedermayer <[email protected]> | 2013-12-06 15:24:10 +0100 |
|---|---|---|
| committer | Michael Niedermayer <[email protected]> | 2013-12-24 01:05:47 +0100 |
| commit | 66a9edfcf677f2673b5163f8008bdc7d0454074c (patch) | |
| tree | 845edd94ea6a7acf0ca36ec378b01e06c330efb6 /libavcodec/utils.c | |
| parent | a9382fc15c15c0517e41db8a294afc4c7696ba19 (diff) | |
do O(1) instead of O(n) atomic operations in register functions
about 1ms faster startup time
Signed-off-by: Michael Niedermayer <[email protected]>
(cherry picked from commit 133fbfc7811ffae7b97dd129fcd0b5e646742362)
Signed-off-by: Michael Niedermayer <[email protected]>
Diffstat (limited to 'libavcodec/utils.c')
| -rw-r--r-- | libavcodec/utils.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/libavcodec/utils.c b/libavcodec/utils.c index 6609f20ef7..9acf7bd770 100644 --- a/libavcodec/utils.c +++ b/libavcodec/utils.c @@ -163,7 +163,8 @@ av_cold void avcodec_register(AVCodec *codec) avcodec_init(); p = &first_avcodec; codec->next = NULL; - while(avpriv_atomic_ptr_cas((void * volatile *)p, NULL, codec)) + + while(*p || avpriv_atomic_ptr_cas((void * volatile *)p, NULL, codec)) p = &(*p)->next; if (codec->init_static_data) @@ -3013,7 +3014,7 @@ void av_register_hwaccel(AVHWAccel *hwaccel) { AVHWAccel **p = &first_hwaccel; hwaccel->next = NULL; - while(avpriv_atomic_ptr_cas((void * volatile *)p, NULL, hwaccel)) + while(*p || avpriv_atomic_ptr_cas((void * volatile *)p, NULL, hwaccel)) p = &(*p)->next; } |