c - Running two independent threads in parallel -

i have written server program 2 threads:

1. sending data client side. 2. receiving data client side 

now when execute them, server accepts request , thread send data created , starts sending data client since joinable, execute until completes execution , other thread not created , control remains in thread.

what need apply in order make both threads run simultaneously?

i think might looking pthread. here sample code wrote when learned how threads work. counter. first thread adds 1 variable each secound, , other prints out.

#include<pthread.h>     //for simultanius threads #include<stdio.h> #include<stdlib.h>      //for _sleep function  //global variables, both thread can reach thease. int = 0; int run = 1;  void *fv(void) {    while( run )     {          _sleep(1000);          a++;     } }  int main(){     pthread_t thread;     pthread_create( &thread, 0, fv, 0 );     printf( "%d", );     while( < 60 )     {         int last = a;         while( last == )            _sleep(50); //let's not burn cpu.         printf( "\r%d", );         _sleep(500); //a won't change while     }     run = 0;     pthread_join( thread, null );     return 0; }