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

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 1ecd1b4aee
commit cf6cf50ac6
3 changed files with 6 additions and 5 deletions
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5
libavcodec/utils.c
View File

@ -218,7 +218,8 @@ 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)
@ -3182,7 +3183,7 @@ 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;
}

2
libavfilter/avfilter.c
View File

@ -487,7 +487,7 @@ 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;

4
libavformat/format.c
View File

@ -54,7 +54,7 @@ void av_register_input_format(AVInputFormat *format)
AVInputFormat **p = &first_iformat;
format->next = NULL;
while(avpriv_atomic_ptr_cas((void * volatile *)p, NULL, format))
while(*p || avpriv_atomic_ptr_cas((void * volatile *)p, NULL, format))
p = &(*p)->next;
}
@ -63,7 +63,7 @@ void av_register_output_format(AVOutputFormat *format)
AVOutputFormat **p = &first_oformat;
format->next = NULL;
while(avpriv_atomic_ptr_cas((void * volatile *)p, NULL, format))
while(*p || avpriv_atomic_ptr_cas((void * volatile *)p, NULL, format))
p = &(*p)->next;
}