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do O(1) instead of O(n) atomic operations in register functions

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about 1ms faster startup time

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 133fbfc781)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer
2013-12-06 15:24:10 +01:00
parent a9382fc15c
commit 66a9edfcf6
3 changed files with 6 additions and 5 deletions
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5
libavcodec/utils.c
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@@ -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;
}