call_out can enter an inifinite loop

[Voltara]

void evil()
{
call_out("evil", 0);
}

The above causes an infinite loop because each call_out apply to "evil" gets a new eval_cost budget.

Propose fixing by limiting eval_cost for new immediate call_outs added while processing call_outs.

[thefallentree]

I believe I actually witnessed one of this kind of bug happen in one of the mud.

CPU basically runs 100% , yet the game is still largely running, until some file got updated and the call out chain is broken.

call_out is also executed after the current(or at the end of ) heart_beat loop, right? So the eva_cost is probably not that useful to limit it.

[Voltara]

I drafted up a working patch for this a few weeks ago; I just need to get around to tidying up the code.

[Voltara]

I'm moving this issue ticket over to fluffos/fluffos (fluffos/fluffos#16)