Re: [lwip-users] Newbie question (tcp_pcb* allocation)

[Jani Monoses]

> Yes, I agree that a listening TCP PCB is a good thing. But what
> happens is; you first allocate a full PCB, then a listening PCB, and
> when the connection occurs, again a full PCB.
> 
> Maybe there should be a way of allocating a listening PCB right away?
> Just an idea, the current stuff works OK furterwise.

I thought about making no distinction between the two types of PCBs at
all. That would greatly simplify the code at the expense of ~100 bytes
per listening socket the assumption (maybe wrong) being that there are
few (most of the time only one) listening PCBs on a given system.
Some tricks can be done to reduce that 100 byte of overhead too.
And I am aware this is a lot of waste for targets which are very RAM
constrained but have enough code memory.