Hi Curt,

I'm actually not using tcpip_thread() or any of the src/api, but rather the 
"raw" API (I'm precluded from using netconn since its
message passing is based on shared memory).  My O/S also does not have 
semaphores.  It has nothing but timer interrupts, network
interface interrupts, and bus interrupts.  I define NO_SYS.

Just in case it's helpful: Are you sure you really don't have shared memory, in it's most trivial meaning? You seem to have a rudimentary O/S which makes it unlikely that memory protection is active.

The point may be if your O/S supports multiple threads. If it does, you might even implement semaphores yourself, and use the multitasking API of lwIP.

Peter


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