Re: Fix spinlock usage in UnpinBuffer()

Qingqing Zhou <zhouqq@cs.toronto.edu> writes:
> There is no LWLock protecting the spinlock in UnpinBuffer(),

I don't believe this is necessary, and if it is necessary the patch
is wrong anyway.  Because the code uses _NoHoldoff, there won't be
any check of InterruptPending in that segment of code.  Furthermore,
any callers who don't have their own interrupt holdoff in force are
probably broken --- it's unlikely that the state of bufmgr is globally
correct if the caller of UnpinBuffer loses control.

Exactly which path of control are you worried about?

            regards, tom lane