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[lwip-users] Raw API / Threading

From: Joe Dupre
Subject: [lwip-users] Raw API / Threading
Date: Wed, 21 Oct 2009 19:12:31 -0400

I'm a bit confused in regards to using the raw API in a multi-threaded 
enviromnent.  The current documentation indicates that you can not call the raw 
API functions from a context outside of the main lwIP process.  Is this true?  
I have old code that appears to refute that.

I have a project using FreeRTOS and what appears to be lwIP v1.1.  In it there 
are separate tasks that call udp_send() while the bulk of lwIP runs in it's own 
task.  This code runs without problem.

I have attempted to upgrade lwIP to v1.3.1,  but now the code crashes a 
non-lwIP task calls udp_send().  Sure enough, if I move that call to the the 
lwIP task it works.

Is it just sheer luck that the old code works at all, or have I perhaps missed 
some new configuration option in my conversion from 1.1 to 1.3?  Among other 
options, I have these set:
#define NO_SYS                          1
#define SYS_LIGHTWEIGHT_PROT            1 (with the relevant functions in 

- Joe

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