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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>
This commit is contained in:
Michael Niedermayer 2013-12-06 15:24:10 +01:00
parent 2b215f3939
commit 133fbfc781
3 changed files with 6 additions and 5 deletions
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2
libavfilter/avfilter.c
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@ -490,7 +490,7 @@ int avfilter_register(AVFilter *filter)
filter->next = NULL;
while(avpriv_atomic_ptr_cas((void * volatile *)f, NULL, filter))
while(*f || avpriv_atomic_ptr_cas((void * volatile *)f, NULL, filter))
f = &(*f)->next;
return 0;