Function init_database_lock

src/jrd/jrd.cpp:7628–7668

static void init_database_lock(thread_db* tdbb)
{
/**************************************
 *
 *	i n i t _ d a t a b a s e _ l o c k
 *
 **************************************
 *
 * Functional description
 *	Initialize the main database lock.
 *
 **************************************/
	SET_TDBB(tdbb);
	Database* const dbb = tdbb->getDatabase();

	// Main database lock

	Lock* const lock = FB_NEW_RPT(*dbb->dbb_permanent, 0)
		Lock(tdbb, 0, LCK_database, dbb, CCH_down_grade_dbb);
	dbb->dbb_lock = lock;

	// Try to get an exclusive lock on database.
	// If this fails, insist on at least a shared lock.

	dbb->dbb_flags |= DBB_exclusive;
	if (!LCK_lock(tdbb, lock, LCK_EX, LCK_NO_WAIT))
	{
		// Clean status vector from lock manager error code
		fb_utils::init_status(tdbb->tdbb_status_vector);

		dbb->dbb_flags &= ~DBB_exclusive;

		while (!LCK_lock(tdbb, lock, LCK_SW, -1))
		{
			fb_utils::init_status(tdbb->tdbb_status_vector);

			// If we are in a single-threaded maintenance mode then clean up and stop waiting
			check_single_maintenance(tdbb);
		}
	}
}


static void prepare_tra(thread_db* tdbb, jrd_tra* transaction, USHORT length, const UCHAR* msg)