lwip Out of semaphore resources

hi

i'm still struggeling trying to get the lwip stack running on a microblaze processor with the xilkernel. my code is still pretty simple and other the initializing the kernel it don't do much. in a sperate thread i call the functions :

mem_init(); memp_init(); pbuf_init();

as debug output i get the message:

"sys_sem_new: Error -- Out of semaphore resources" three times for every function.

any hints what i have to do?

another problem is when i try to create a socket. i pretty much use the code from the xilinx os_libs.pdf. when i try to create a socket the programm just gets stuck there. don't know if this is connected with the above problem...

thanks urban