Neil Conway wrote:
I don't like accessing shared data structures without acquiring the
appropriate locks; even if it doesn't break anything, it seems like just
asking for trouble. In order to be able to inspect a buffer's tag in
Tom's new locking scheme (not yet in HEAD, but will be in 8.1), you need
only hold a per-buffer lock. That will mean acquiring and releasing a
spinlock for each buffer, which isn't _too_ bad...
I am looking at this bit now.
I take the first part to mean that don't need to wrap
LWLockAcquire(BufMgrLock, LW_EXCLUSIVE) ... LWLockRelease(BufMgrLock)
around the inspection of the buffers (?)
This per buffer lock, are we talking about LockBuffer(buf,
BUFFER_LOCK_SHARE) ... releaseBuffer(buf) ?
If so, it looks like I need to do some stuff with ResourceOwners,
otherwise ReleaseBuffer will fail (or am I wandering up the wrong track
here?). I am using anoncvs from yesterday, so if Tom's new scheme is
*very* new I may be missing it.
Thanks
Mark
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