Function requeueRecentlyUsed

src/jrd/cch.cpp:5122–5161

void requeueRecentlyUsed(BufferControl* bcb)
{
	BufferDesc* chain = NULL;

	// Let's pick up the LRU pending chain, if any

	for (;;)
	{
		chain = bcb->bcb_lru_chain;
		if (bcb->bcb_lru_chain.compare_exchange_strong(chain, NULL))
			break;
	}

	if (!chain)
		return;

	// Next, let's flip the order

	BufferDesc* reversed = NULL;
	BufferDesc* bdb;

	while ((bdb = chain) != NULL)
	{
		chain = bdb->bdb_lru_chain;
		bdb->bdb_lru_chain = reversed;
		reversed = bdb;
	}

	while ((bdb = reversed) != NULL)
	{
		reversed = bdb->bdb_lru_chain;
		QUE_DELETE(bdb->bdb_in_use);
		QUE_INSERT(bcb->bcb_in_use, bdb->bdb_in_use);

		bdb->bdb_lru_chain = NULL;
		bdb->bdb_flags &= ~BDB_lru_chained;
	}

	chain = bcb->bcb_lru_chain;
}


BufferControl* BufferControl::create(Database* dbb)