Function SDW_get_shadows

src/jrd/sdw.cpp:526–571

void SDW_get_shadows(thread_db* tdbb)
{
/**************************************
 *
 *	S D W _ g e t _ s h a d o w s
 *
 **************************************
 *
 * Functional description
 *	Get any new shadows that have been
 *	defined.
 *
 **************************************/
	SET_TDBB(tdbb);
	Database* dbb = tdbb->getDatabase();
	CHECK_DBB(dbb);

	SyncLockGuard guard(&dbb->dbb_shadow_sync, SYNC_EXCLUSIVE, "SDW_get_shadows");

	// unless we have one, get a shared lock to ensure that we don't miss any signals

	dbb->dbb_ast_flags &= ~DBB_get_shadows;

	Lock* lock = dbb->dbb_shadow_lock;

	if (lock->lck_physical != LCK_SR)
	{
		// fb_assert (lock->lck_physical == LCK_none);

		WIN window(HEADER_PAGE_NUMBER);
		const header_page* header = (header_page*) CCH_FETCH(tdbb, &window, LCK_read, pag_header);
		lock->setKey(header->hdr_shadow_count);
		LCK_lock(tdbb, lock, LCK_SR, LCK_WAIT);
		CCH_RELEASE(tdbb, &window);
	}

	// get all new shadow files, marking that we looked at them first
	// to prevent missing any new ones later on, although it does not
	// matter for the purposes of the current page being written

	// no use even trying to get shadow files in a case when we invoked from
	// JRD_shutdown_database, i.e. there are no attachments to database

	if (tdbb->getAttachment())
		MET_get_shadow_files(tdbb, false);
}


void SDW_init(thread_db* tdbb, bool activate, bool delete_files)