C++ (Cpp) GetSegmentList Examples

Example #1

File: cdbutil.c Project: BALDELab/incubator-hawq

List *
GetVirtualSegmentList(void)
{
#if 0
	List	*real_segments = GetSegmentList();
	int		real_segment_num = list_length(real_segments);
	Segment *dest;
	Segment *src;

	src = linitial(real_segments);
	dest = CopySegment(src);
	dest->id = real_segment_num;
	dest->dbid = real_segment_num + 1;

	return lappend(real_segments, dest);
#else
	return GetSegmentList();
#endif
}

Example #2

/*
 * LoadDbgInfo
 */
bool LoadDbgInfo( ModuleNode *mod )
{
    dip_priority    priority;

    if( !GetSegmentList( mod ) )
        return( false );
    mod->syminfo->procinfo = DIPCreateProcess();
    for( priority = 0; (priority = DIPPriority( priority )) != 0; ) {
        mod->syminfo->hdl = DIPLoadInfo( mod->fp, 0, priority );
        if( mod->syminfo->hdl != NO_MOD ) {
            break;
        }
    }
    if( mod->syminfo->hdl == NO_MOD )
        return( false );
    return( true );
}

Example #3

File: cdbpgdatabase.c Project: BALDELab/incubator-hawq

/*
 * pgdatabasev - produce a view of pgdatabase to include transient state
 */
Datum
gp_pgdatabase__(PG_FUNCTION_ARGS)
{
	FuncCallContext *funcctx;
	Working_State *mystatus;

	if (SRF_IS_FIRSTCALL())
	{
		TupleDesc	tupdesc;
		MemoryContext oldcontext;

		/* create a function context for cross-call persistence */
		funcctx = SRF_FIRSTCALL_INIT();

		/*
		 * switch to memory context appropriate for multiple function
		 * calls
		 */
		oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);

		/* build tupdesc for result tuples */
		/* this had better match pg_prepared_xacts view in	system_views.sql */
		tupdesc = CreateTemplateTupleDesc(5, false);
		TupleDescInitEntry(tupdesc, (AttrNumber) 1, "dbid",
						   INT2OID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 2, "isprimary",
						   BOOLOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 3, "content",
						   INT2OID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 4, "valid",
						   BOOLOID, -1, 0);
		TupleDescInitEntry(tupdesc, (AttrNumber) 5, "definedprimary",
						   BOOLOID, -1, 0);

		funcctx->tuple_desc = BlessTupleDesc(tupdesc);

		/*
		 * Collect all the locking information that we will format and
		 * send out as a result set.
		 */
		mystatus = (Working_State *) palloc(sizeof(Working_State));
		funcctx->user_fctx = (void *) mystatus;

		mystatus->master = GetMasterSegment();
		mystatus->standby = GetStandbySegment();
		mystatus->segments = GetSegmentList();
		mystatus->idx = 0;

		MemoryContextSwitchTo(oldcontext);
	}

	funcctx = SRF_PERCALL_SETUP();
	mystatus = (Working_State *) funcctx->user_fctx;

	while (mystatus->master || mystatus->standby || (mystatus->idx < list_length(mystatus->segments)))
	{
		Datum		values[6];
		bool		nulls[6];
		HeapTuple	tuple;
		Datum		result;
		Segment 	*current = NULL;

		if (mystatus->master)
		{
			current = mystatus->master;
			mystatus->master = NULL;
		}
		else if (mystatus->standby)
		{
			current = mystatus->standby;
			mystatus->standby = NULL;
		}
		else
		{
			current = list_nth(mystatus->segments, mystatus->idx);
			mystatus->idx++;
		}

		/*
		 * Form tuple with appropriate data.
		 */
		MemSet(values, 0, sizeof(values));
		MemSet(nulls, false, sizeof(nulls));

		//values[0] = UInt16GetDatum(current->dbid);
		values[1] = current->standby ? false : true;;
		values[2] = UInt16GetDatum(current->segindex);

		values[3] = BoolGetDatum(true);
		values[4] = values[1];

		tuple = heap_form_tuple(funcctx->tuple_desc, values, nulls);
		result = HeapTupleGetDatum(tuple);
		SRF_RETURN_NEXT(funcctx, result);
	}

	SRF_RETURN_DONE(funcctx);
}