pthread based application + Simple_Socket_Server Example

i am trying to implement TCP based Chat Programm on Altera ESDK board.

for this i have write a TCP based Server and Client on linux (ubuntu 12.04 LTS) machine and successfully connect them, i am using pthread over there.

now i am trying to build same application on nios-ii platform and add the following to "Simple Socket Server" Example.

1. #include <pthread.h>

2. in main program

pthread_t myThread;

create_pthread( &myThread,NULL, myfunction,NULL);

3. function to be called outside the "simple_socket_server" example

void *myfunction() {}

after building the code my simple_socket_server example generate a error saying

error: 'pthread_t' undeclared (first use in the function)

1. is ptherad not supported by nios-ii ...?

2. is any other way to create thread or parallel programming on nios-ii...?

Regards

kaushal