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Comments to indicate where memory barriers may be needed. 

Originally committed as revision 17867 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2009-03-08 00:45:45 +00:00
parent 616e899c43
commit a936475949
1 changed files with 3 additions and 0 deletions
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3
libavutil/fifo.c
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@ -91,6 +91,7 @@ int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int (*func)(void
memcpy(f->wptr, src, len);
src = (uint8_t*)src + len;
}
// Write memory barrier needed for SMP here in theory
f->wptr += len;
if (f->wptr >= f->end)
f->wptr = f->buffer;
@ -103,6 +104,7 @@ int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int (*func)(void
int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void*, int), void* dest)
{
// Read memory barrier needed for SMP here in theory
do {
int len = FFMIN(f->end - f->rptr, buf_size);
if(func) func(dest, f->rptr, len);
@ -110,6 +112,7 @@ int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void
memcpy(dest, f->rptr, len);
dest = (uint8_t*)dest + len;
}
// memory barrier needed for SMP here in theory
av_fifo_drain(f, len);
buf_size -= len;
} while (buf_size > 0);