[postgis-users] where are the getting buf data from disk really done?

[sunpeng]

I noticed at the function StartBufferIO() in bufmgr.c, there is no really
getting buffer data from disk, only set InProgressBuf = buf; and return
true;
i wondered where are the getting buf data from disk really done?
are there a background process to do this work? which function does this
work?
thanks!

peng
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