Function PAG_set_db_readonly

src/jrd/pag.cpp:1771–1823

void PAG_set_db_readonly(thread_db* tdbb, bool flag)
{
/*********************************************
 *
 *	P A G _ s e t _ d b _ r e a d o n l y
 *
 *********************************************
 *
 * Functional description
 *	Set database access mode to readonly OR readwrite
 *
 *********************************************/
	SET_TDBB(tdbb);
	Database* dbb = tdbb->getDatabase();

	WIN window(HEADER_PAGE_NUMBER);
	header_page* header = (header_page*) CCH_FETCH(tdbb, &window, LCK_write, pag_header);

	if (!flag)
	{
		// If the database is transitioning from RO to RW, reset the
		// in-memory Database flag which indicates that the database is RO.
		// This will allow the CCH subsystem to allow pages to be MARK'ed
		// for WRITE operations
		header->hdr_flags &= ~hdr_read_only;
		dbb->dbb_flags &= ~DBB_read_only;

		// Take into account current attachment ID, else next attachment
		// (cache writer, for examle) will get the same att ID and wait
		// for att lock indefinitely.
		Attachment* att = tdbb->getAttachment();
		if (att->att_attachment_id)
			Ods::writeAttID(header, att->att_attachment_id);

		// This is necessary as dbb's Next could be less than OAT.
		// And this is safe as we currently in exclusive attachment and
		// all executed transactions was read-only.
		dbb->dbb_next_transaction = Ods::getNT(header);
		dbb->dbb_oldest_transaction = Ods::getOIT(header);
		dbb->dbb_oldest_active = Ods::getOAT(header);
		dbb->dbb_oldest_snapshot = Ods::getOST(header);
	}

	CCH_MARK_MUST_WRITE(tdbb, &window);

	if (flag)
	{
		header->hdr_flags |= hdr_read_only;
		dbb->dbb_flags |= DBB_read_only;
	}

	CCH_RELEASE(tdbb, &window);
}


void PAG_set_db_replica(thread_db* tdbb, ReplicaMode mode)