Re: [lwip-users] lwip with & without OS (need help & advice)

[address@hidden]

sanjib das wrote:
> Hi All,
Hi onebrother,
> I am very new to lwip. I have a very basic doubt on porting lwip with 
> & without OS.
> I googled a lot...but dint get as such any link where things are 
> explained in detail.
In the lwIP case, "OS" has nothing to do with Linux or Windows or other 
full-featured operating systems. Instead, it means the ability to have 
multiple threads. lwIP as such is targeted for embedded systems only. 
You can compile it to run as a process in user-space on Linux or Windows 
(and others), but first, you need a way to access a network device from 
there (e.g. by using pcap or a tunnel-interface) and on the other hand, 
you won't get the same performance as you do with these OS's internal 
network stacks as lwIP often favours small size over high speed.

So, in the lwIP case, "without OS" means you have on big main loop only 
(aside from interrupts), while "with OS" means that you have a small 
embedded OS that provides threading support, semaphores, mailboxes, etc.

OTOH, there are working ports for Linux and windows in the contrib 
module in CVS, but that's simply not the main target of lwIP.

Simon