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

about 1ms faster startup time

Michael Niedermayer committed 12 years ago

Commit 133fbfc1 parent 2b215f33 files · +6 −5Browse files

Showing the changes to libavfilter/avfilter.c (1 of 3 files). Show all

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libavfilter/avfilter.c+1−1
@@ -490,7 +490,7 @@ int avfilter_register(AVFilter *filter) · 489 unmodified lines
490490
491491 filter->next = NULL;
492492
493− while(avpriv_atomic_ptr_cas((void * volatile *)f, NULL, filter))
493+ while(*f || avpriv_atomic_ptr_cas((void * volatile *)f, NULL, filter))
494494 f = &(*f)->next;
495495
496496 return 0;

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