#include <stdio.h>

#include <stdlib.h>

#include <sys/time.h>

#include <string.h>

#include <unistd.h>

#include <signal.h>

#include "mythreads.h"

#define BIG 1000

#define TIMER_INTERVAL_US 10

ucontext_t main_context, thread_context;

void timer_handler (int signum)

{

if (!interruptsAreDisabled)

{

printf(" interrupting\n");

threadYield();

}

}

//setup the timer

void set_timer()

{

struct sigaction sa;

struct itimerval timer;

/* Install timer_handler as the signal handler for SIGVTALRM. */

memset (&sa, 0, sizeof (sa));

sa.sa_handler = &timer_handler;

sigaction (SIGALRM, &sa, NULL);

/* Configure the timer to expire after TIMER_INTERVAL_US usec */

timer.it_value.tv_sec = 0;

timer.it_value.tv_usec = TIMER_INTERVAL_US;

/* and every TIMER_INTERVAL_US usec after that. */

timer.it_interval.tv_sec = 0;

timer.it_interval.tv_usec = TIMER_INTERVAL_US;

/* Start a virtual timer. It counts down whenever this process is executing. */

if (0 != setitimer (ITIMER_REAL, &timer, NULL))

{

perror("setitimer error");

}

}

int main(void)

{

int id1, id2;

int p1;

int p2;

p1 = 23;

p2 = 2;

int *result1, *result2;

//initialize the threading library. DON'T call this more than once!

threadInit();

//always start the timer after threadInit

set_timer();

id1 = threadCreate(/*some func*/,(void*)&p1);

printf("created thread 1.\n");

id2 = threadCreate(/*some func*/,(void*)&p2);

printf("created thread 2.\n");

threadJoin(id1, (void*)&result1);

printf("joined #1 --> %d.\n",*result1);

}

extern void threadInit() {

NODE *front,*rear,*temp,*front1;

}

extern int threadCreate(thFuncPtr funcPtr, void *argPtr) {

char * myStack = malloc(STACK_SIZE);

getcontext(&thread_context);

thread_context.uc_stack.ss_sp = myStack;

thread_context.uc_stack.ss_size = STACK_SIZE;

thread_context.uc_link = &main_context;

makecontext(&thread_context, (void (*)(void) funcPtr, 1, *argPtr);

}