int main (void)
{
int test;
// initialize mutex, condition variable and barrier.
mythread_mutex_init (&mut, NULL);
mythread_cond_init (&con, NULL);
// 4 threads will be calling wait.
mythread_barrier_init (&barr, NULL, 4);
mythread_setconcurrency (8);
// create first 3 threads and assign them functions.
mythread_create (&t1, NULL, foo1, NULL);
mythread_create (&t2, NULL, foo2, NULL);
mythread_create (&t3, NULL, foo3, NULL);
// stall main until all threads have finished.
if ((test = mythread_barrier_wait (&barr) != 0) && (test != MYTHREAD_BARRIER_SERIAL_THREAD))
PASS--;
// after this stage, mutex and condition variables are not required, destroy them.
if ( mythread_cond_destroy (&con) != 0)
PASS --;
if ( mythread_mutex_destroy (&mut) != 0)
PASS --;
// create next 3 threads and assign functions. This is to test reusability of barriers.
mythread_create (&t4, NULL, foo3, NULL);
mythread_create (&t5, NULL, foo4, NULL);
mythread_create (&t6, NULL, foo5, NULL);
// let main also wait on the barrier
if ((test = mythread_barrier_wait (&barr) != 0) && (test != MYTHREAD_BARRIER_SERIAL_THREAD))
PASS--;
// at this point, we are sure that all the threads have finished running. Now check value of PASS for any errors.
// If PASS is 0, means all function executed successfully. If PASS is less than 0, atleast one function returned error.
// print PASS or FAIL accordingly.
if (PASS == 0)
printf ("PASS\n");
else
printf ("FAIL\n");
//destroy the barrier and exit.
mythread_barrier_destroy (&barr);
mythread_exit(NULL);
return 0;
}
void *barrierTest() {
count++;
mythread_barrier_wait(&barrier);
if ( count == N ) {
first_test++;
}
count1 ++;
mythread_barrier_wait(&barrier);
if ( count1 == N ) {
second_test++;
}
}
void *barrierTest(void* arg){
mythread_enter_kernel();
printf("Going to sleep...%ld\n",mythread_self());
mythread_leave_kernel();
//sleep(5);
mythread_barrier_wait(&mybarrier);
mythread_enter_kernel();
printf("Moving towards new barrier... %ld\n",mythread_self());
mythread_leave_kernel();
mythread_barrier_wait(&mybarrier);
mythread_enter_kernel();
printf("%ld exiting... %ld\n",mythread_self());
mythread_leave_kernel();
mythread_exit(NULL);
}
void *foo4 (void *arg)
{
int test;
int val = 0;
while (val < 9999)
val++;
if ((test = mythread_barrier_wait (&barr) != 0) && (test != MYTHREAD_BARRIER_SERIAL_THREAD))
PASS--;
while (val > 0)
val--;
return NULL;
}
// grab the lock. If count is less than 100, then wait for signal. Once signal is recieved, unlock mutex and wait on barrier.
void *foo1 (void *arg)
{
int test;
mythread_mutex_lock (&mut);
while (count < 100)
{
mythread_cond_wait (&con, &mut);
}
if ( mythread_mutex_unlock (&mut) != 0)
PASS--;
if ((test = mythread_barrier_wait (&barr) != 0) && (test != MYTHREAD_BARRIER_SERIAL_THREAD))
PASS--;
return NULL;
}
/* Each thread will increment the count (global) protected by mutex */
void* thread_func(void *arg)
{
char buffer[1024];
/*Lock Mutex*/
int temp = 0;
mythread_mutex_lock(&mutex);
while(temp<1000){
temp++;
}
/*Wait to increment until main thread signals*/
mythread_cond_wait(&condition,&mutex);
count++;
mythread_enter_kernel();
sprintf(buffer, "Incremented Count to : %d\n", count);
printToConsole(buffer);
mythread_leave_kernel();
mythread_mutex_unlock(&mutex);
/* Threads will wait on the barrier. Main thread will also wait */
mythread_barrier_wait(&barrier);
mythread_exit(NULL);
}
int main(int argc, char **argv)
{
int i;
char buffer[1024];
futex_init(&printFutex, 1);
mythread_t mythread1[NTHREADS];
mythread_t signalingThread[NTHREADS/2];
mythread_setconcurrency(4);
mythread_mutex_init(&mutex,NULL);
mythread_cond_init(&condition,NULL);
mythread_barrier_init(&barrier,NULL,NTHREADS+1);
/* Create Threads */
for(i=0;i<NTHREADS;i++){
sprintf(buffer, "Created thread : %d\n", i+1);
printToConsole(buffer);
mythread_create(&mythread1[i],NULL,&thread_func, NULL);
}
/*Signal threads waiting on cond var*/
while(count<NTHREADS){
/* Special case for testing broadcast*/
if(count == NTHREADS/2){
mythread_cond_broadcast(&condition);
}else{
mythread_cond_signal(&condition);
}
}
/* Waiting on barrier. Last thread, or this main thread will unblock the barrier depending on the execution sequence */
mythread_barrier_wait(&barrier);
sprintf(buffer, "Out of barrier, main thread exiting..\n");
printToConsole(buffer);
/* Destroy mutex, barrier and cond*/
mythread_cond_destroy(&condition);
mythread_mutex_destroy(&mutex);
mythread_barrier_destroy(&barrier);
sprintf(buffer, "Finished Execution\n");
printToConsole(buffer);
}
