Function TRA_fetch_state

src/jrd/tra.cpp:613–647

int TRA_fetch_state(thread_db* tdbb, TraNumber number)
{
/**************************************
 *
 *	T R A _ f e t c h _ s t a t e
 *
 **************************************
 *
 * Functional description
 *	Physically fetch the state of a given
 *	transaction on the transaction inventory
 *	page.
 *
 **************************************/
	SET_TDBB(tdbb);
	Database* dbb = tdbb->getDatabase();
	CHECK_DBB(dbb);

	// locate and fetch the proper TIP page

	const ULONG trans_per_tip = dbb->dbb_page_manager.transPerTIP;
	const ULONG tip_seq = number / trans_per_tip;
	WIN window(DB_PAGE_SPACE, -1);
	const tx_inv_page* tip = fetch_inventory_page(tdbb, &window, tip_seq, LCK_read);

	// calculate the state of the desired transaction

	const ULONG byte = TRANS_OFFSET(number % trans_per_tip);
	const USHORT shift = TRANS_SHIFT(number);
	const int state = (tip->tip_transactions[byte] >> shift) & TRA_MASK;

	CCH_RELEASE(tdbb, &window);

	return state;
}


void TRA_get_inventory(thread_db* tdbb, UCHAR* bit_vector, TraNumber base, TraNumber top)