Function IncrBufferRefCount

src/backend/storage/buffer/bufmgr.c:4018–4034

* IncrBufferRefCount * Increment the pin count on a buffer that we have *already* pinned * at least once. * * This function cannot be used on a buffer we do not have pinned, * because it doesn't change the shared buffer state. */

 *		because it doesn't change the shared buffer state.
 */
void
IncrBufferRefCount(Buffer buffer)
{
	Assert(BufferIsPinned(buffer));
	ResourceOwnerEnlargeBuffers(CurrentResourceOwner);
	if (BufferIsLocal(buffer))
		LocalRefCount[-buffer - 1]++;
	else
	{
		PrivateRefCountEntry *ref;

		ref = GetPrivateRefCountEntry(buffer, true);
		Assert(ref != NULL);
		ref->refcount++;
	}
	ResourceOwnerRememberBuffer(CurrentResourceOwner, buffer);
}

/*
 * MarkBufferDirtyHint