On Friday 11 September 2015 18:14:21 Andres Freund wrote:
> This way we can leave the for (;;) loop
> in BufferAlloc() thinking that the buffer is unused (and can't be further
> pinned because of the held spinlock!)

We lost lock after PinBuffer_Locked in BufferAlloc. Therefore, in essence, 
nothing has changed. 
YUriy Zhuravlev
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company

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