Function CCH_mark

src/jrd/cch.cpp:1679–1763

void CCH_mark(thread_db* tdbb, WIN* window, bool mark_system, bool must_write)
{
/**************************************
 *
 *	C C H _ m a r k
 *
 **************************************
 *
 * Functional description
 *	Mark a window as dirty.
 *
 **************************************/
	BufferDesc* bdb = window->win_bdb;
	BLKCHK(bdb, type_bdb);

	SET_TDBB(tdbb);
	Database* dbb = tdbb->getDatabase();
	tdbb->bumpStats(RuntimeStatistics::PAGE_MARKS);

	BufferControl* bcb = dbb->dbb_bcb;

	if (!(bdb->bdb_flags & BDB_writer))
		BUGCHECK(208);			// msg 208 page not accessed for write

	CCH_TRACE(("MARK    %d:%06d", window->win_page.getPageSpaceID(), window->win_page.getPageNum()));

	// A LATCH_mark is needed before the BufferDesc can be marked.
	// This prevents a write while the page is being modified.

	if (!(bdb->bdb_flags & BDB_marked))
		bdb->lockIO(tdbb);

	fb_assert(bdb->ourIOLock());

	// Allocate difference page (if in stalled mode) before mark page as dirty.
	// It guarantees that disk space is allocated and page could be written later.

	if (!set_diff_page(tdbb, bdb))
	{
		clear_dirty_flag_and_nbak_state(tdbb, bdb);

		bdb->unLockIO(tdbb);
		CCH_unwind(tdbb, true);
	}

	fb_assert(dbb->dbb_backup_manager->getState() != Ods::hdr_nbak_unknown);

	bdb->bdb_incarnation = ++bcb->bcb_page_incarnation;

	// mark the dirty bit vector for this specific transaction,
	// if it exists; otherwise mark that the system transaction
	// has updated this page

	int newFlags = 0;
	TraNumber number;
	jrd_tra* transaction = tdbb->getTransaction();
	if (transaction && (number = transaction->tra_number))
	{