Fantastic! That solved this problem.
However I still get a crash if I change:
is_even to bool
num->is_even = ((base_num + i) % 2 == 0) ? true : false;
retvals[1] = BoolGetDatum(list->pp_numbers[call_cntr]->is_even);
CREATE OR REPLACE FUNCTION
pg_srf(OUT value integer, OUT is_even bit)
RETURNS
SETOF record
AS
'pg_srf.so', 'pg_srf'
LANGUAGE
C
STRICT
IMMUTABLE;
> Date: Sun, 15 Mar 2015 17:03:38 +0100
> From: andres@2ndquadrant.com
> To: itaid@outlook.com
> CC: pgsql-hackers@postgresql.org
> Subject: Re: [HACKERS] Crash on SRF execution
>
> Hi,
>
> On 2015-03-15 17:59:39 +0200, Itai wrote:
> > Thanks for the quick response!! :)
> > But I don't get it... isn't:
> > if (SRF_IS_FIRSTCALL()){
> > }
> > the iterator one time
> > "initialization block" where I setup the data to be iterated
> > upon?
> >
> > Can you please elaborate on how should I fix this? I'm probably missing something basic...
>
> > > > if (SRF_IS_FIRSTCALL())
> > > > {
> > > > length = 4000;
> > > > base_num = 1203000000;
> > > > list = (NumberList *)palloc(sizeof(NumberList));
> > > > list->pp_numbers = (Number **)palloc(sizeof(Number*) * length);
>
> You allocate memory in the per call context here.
>
> > > > list->length = length;
> > > > i = 0;
> > > > for (; i < length; i++)
> > > > {
> > > > num = (Number *)palloc(sizeof(Number));
> > > > num->value = base_num + i;
> > > > num->is_even = ((base_num + i) % 2 == 0) ? 1 : 0;
> > > > list->pp_numbers[i] = num;
> > > > }
> > > > ereport(INFO, (errmsg("----------- data source -----------")));
> > > > i = 0;
> > > > for (; i < length; i++)
> > > > {
> > > > ereport(INFO, (errmsg("value: %d", list->pp_numbers[i]->value)));
> > > > ereport(INFO, (errmsg("is_even: %d", list->pp_numbers[i]->is_even)));
> > > > }
> > > >
> > > > funcctx = SRF_FIRSTCALL_INIT();
> > > > oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
>
> Because you only switch the memory context here. Move this up, to the
> beginning of the SRF_IS_FIRSTCALL block. Before the palloc()s.
>
> Greetings,
>
> Andres Freund
>
> --
> Andres Freund http://www.2ndQuadrant.com/
> PostgreSQL Development, 24x7 Support, Training & Services
>
>
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