Function CCH_forget_page

src/jrd/cch.cpp:1071–1131

void CCH_forget_page(thread_db* tdbb, WIN* window)
{
/**************************************
 *
 *	C C H _ f o r g e t _ p a g e
 *
 **************************************
 *
 * Functional description
 *	Page was faked but can't be written on disk. Most probably because
 *	of out of disk space. Release page buffer and others resources and
 *	unlink page from various queues
 *
 **************************************/
	SET_TDBB(tdbb);
	BufferDesc* bdb = window->win_bdb;
	Database* dbb = tdbb->getDatabase();

	if (window->win_page != bdb->bdb_page || bdb->bdb_buffer->pag_type != pag_undefined)
		return;	// buffer was reassigned or page was reused

	window->win_bdb = NULL;

	if (bdb->bdb_flags & BDB_io_error)
		dbb->dbb_flags &= ~DBB_suspend_bgio;

	clear_dirty_flag_and_nbak_state(tdbb, bdb);
	BufferControl* bcb = dbb->dbb_bcb;

	removeDirty(bcb, bdb);

	// remove from LRU list
	{
		SyncLockGuard lruSync(&bcb->bcb_syncLRU, SYNC_EXCLUSIVE, FB_FUNCTION);
		requeueRecentlyUsed(bcb);
		QUE_DELETE(bdb->bdb_in_use);
	}

	// remove from hash table and put into empty list
#ifndef HASH_USE_CDS_LIST
	{
		SyncLockGuard bcbSync(&bcb->bcb_syncObject, SYNC_EXCLUSIVE, FB_FUNCTION);
		bcb->bcb_hashTable->remove(bdb);
		QUE_INSERT(bcb->bcb_empty, bdb->bdb_que);
		bcb->bcb_inuse--;
	}
#else
	bcb->bcb_hashTable->remove(bdb);

	{
		SyncLockGuard syncEmpty(&bcb->bcb_syncEmpty, SYNC_EXCLUSIVE, FB_FUNCTION);
		QUE_INSERT(bcb->bcb_empty, bdb->bdb_que);
		bcb->bcb_inuse--;
	}
#endif

	bdb->bdb_flags = 0;