Programming

//code snippet from main:
/* context names for scheduler and threads, TODO maybe set up threads as an array? */
ucontext_t sched;
ucontext_t T1;


  /* Set up context and memory for threads, not sure what
   * the flags do
   */
    if(DEBUG){ printf("create context and memory for threads\n");}
    getcontext(&T1);
    if ((T1.uc_stack.ss_sp = malloc(THREAD_STK)) == NULL){
        perror("T1 malloc"), exit(1);      
    }
    T1.uc_stack.ss_flags = 0;
    T1.uc_link = &sched;
    makecontext(&T1, produce_sm, 0);
           
   
    
    /* save main, swap to a thread */
    if(DEBUG){ printf("save sched, swap to T1\n");}
    if(getcontext(&sched) == -1){ /* save main */
        perror("sched get error");
    }

    if ((sched.uc_stack.ss_sp = malloc(THREAD_STK)) == NULL){ /* main stack space */
        die("sched malloc");      
    }
//FAILS HERE
    if(swapcontext(&sched, &T1) == -1){ /* swap to T1 */
        die("sched swap error");
    }

void produce_sm(){
   printf("I'm T1\n"); 
    
   
   printf("swap from T1 to sched\n");
   if(swapcontext(&T1, &sched) == -1){die("T1 swap");}
}