Re: Fix spinlock usage in UnpinBuffer()

["Qingqing Zhou" <zhouqq(at)cs(dot)toronto(dot)edu>]

"Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote
>
> I noticed that shmem.c holds ShmemIndexLock considerably longer than any
> other spinlock is held, and across operations that could theoretically
> fail (hashtable manipulations).  This doesn't matter a lot in the Unix
> code because only the postmaster ever executes ShmemInitStruct, but
> in the Windows port we run that code every time a backend is launched.
> I think that we could convert that spinlock to an LWLock.  Will look into 
> it.
>

Yeah, use LWLock is a safer way in order to recover to unlock status.

Regards,
Qingqing