/* Consumer thread - remove items from the "buffer"
* until they've all been transfered. */
void *thread_start(void *arg) {
sthread_mutex_lock(mutex);
while (transfered < max_transfer) {
/* Wait for main() to put something up for us to take */
while (transfered < max_transfer && waiting == 0) {
sthread_cond_wait(avail_cond, mutex);
/* This isn't part of using cond vars, but
* helps the test fail quickly if they aren't
* working properly: */
sthread_mutex_unlock(mutex);
sthread_yield();
sthread_mutex_lock(mutex);
}
/* Either there is something waiting, or we've finished */
if (waiting != 0) {
/* Take it */
waiting--;
transfered++;
}
}
sthread_mutex_unlock(mutex);
return 0;
}
int main(int argc, char **argv)
{
int checks;
printf("Testing sthread_mutex_*, impl: %s\n",
(sthread_get_impl() == STHREAD_PTHREAD_IMPL) ? "pthread" : "user");
sthread_init();
mutex = sthread_mutex_init();
sthread_mutex_lock(mutex);
if (sthread_create(thread_start, (void*)1, 1) == NULL) {
printf("sthread_create failed\n");
exit(1);
}
/* Wait until the other thread has at least started,
* to give it a chance at getting through the mutex incorrectly. */
while (ran_thread == 0) {
sthread_yield();
}
sthread_dump();
/* The other thread has run, but shouldn't have been
* able to affect counter (note that this is not a great test
* for preemptive scheduler, since the other thread's sequence
* is not atomic). */
assert(counter == 0);
/* This should let the other thread run at some point. */
sthread_mutex_unlock(mutex);
/* Allow up to 100 checks in case the scheduler doesn't
* decide to run the other thread for a really long time. */
checks = 100;
while (checks > 0) {
sthread_mutex_lock(mutex);
if (counter != 0) {
/* The other thread ran, got the lock,
* and incrmented the counter: test passes. */
checks = -1;
} else {
checks--;
}
sthread_mutex_unlock(mutex);
/* Nudge the scheduler to run the other thread: */
sthread_yield();
}
if (checks == -1) {
printf("sthread_mutex passed\n");
} else {
printf("*** sthread_mutex failed\n");
}
sthread_mutex_free(mutex);
return 0;
}
/* Try and get the lock.
* When acquired, mark a global to let main know. */
void *thread_start(void *arg) {
/* indicate we got in to this thread. Don't try to printf() here
* though, or the check in the main thread will fail sometimes. */
ran_thread = 1;
/* should wait until main() has released us */
sthread_mutex_lock(mutex);
counter++;
sthread_mutex_unlock(mutex);
return 0;
}
/* Try and get the lock.
* When acquired, mark a global to let main know. */
void *thread_start(void *arg)
{
/* indicate we got in to this thread */
ran_thread = 1;
/* should wait until main() has released us */
sthread_mutex_lock(mutex);
counter++;
sthread_mutex_unlock(mutex);
return 0;
}
void f3()
{
int i;
for(i=0;i<LOOP;i++)
{
sthread_mutex_lock(m);
sum+=1;
printf("sum3----------- %d\n",sum);
sthread_mutex_unlock(m);
usleep(TIMESLOT/10);
}
printf("fun3 finished\n");
}
int sthread_mutex_unlock(sthread_mutex_t *mutex,int tid)
{
//enable if you want to test other thread unable to get lock...
// sleep(1);
int ret_val;
if(mutex->lock==1){
if(mutex->tid==tid){
//check counter
if(mutex->counter==0){
mutex->lock = 0;
ret_val = 0;
if(isWaitingEmpty(mutex)){
printf("No threads waiting\n");
}
else{
//wake up the mutex in waiting that is in front
sthread_wake(mutex->waiting[mutex->front]);
//dequeue the mutex
dequeueWait(mutex);
}
}
else if(mutex->counter>0){
mutex->counter = mutex->counter - 1;
printf("Thread %d, making recursive call to unlock lock\n",tid);
sthread_mutex_unlock(mutex,tid);
}
}
mutex->lock=0;
ret_val = 0;
}
else{
ret_val = -1;
}
return ret_val;
}
int main(int argc, char **argv) {
sthread_mutex_t mutex = NULL;
int i = 0;
printf("Testing sthread_mutex_*, impl: %s\n",
(sthread_get_impl() == STHREAD_PTHREAD_IMPL) ? "pthread" : "user");
sthread_init();
mutex = sthread_mutex_init();
while (i < 10) {
sthread_mutex_lock(mutex);
printf("i=%i\n",i);
i++;
sthread_yield();
sthread_mutex_unlock(mutex);
}
printf("\nSUCESSO!\n");
return 1;
}
int threadmain(void *arg)
{
int tid = (int)arg;
sthread_mutex_lock(mut_ptr,tid);
sthread_mutex_lock(mut_ptr,tid);
//I am intentionally putting a delay here to show that threads 2 and 3 become suspended.
if(tid==1){
sleep(10);
}
//critical region
printf("Thread %d entered critical region\n",tid);
sthread_mutex_unlock(mut_ptr,tid);
return 0;
}
int main(int argc, char **argv) {
int sent, checks, i;
sthread_t child[MAXTHREADS];
printf("Testing sthread_cond_*, impl: %s\n",
(sthread_get_impl() == STHREAD_PTHREAD_IMPL) ? "pthread" : "user");
assert(num_threads <= MAXTHREADS);
sthread_init();
mutex = sthread_mutex_init();
avail_cond = sthread_cond_init();
sthread_mutex_lock(mutex);
for (i = 0; i < num_threads; i++) {
child[i] = sthread_create(thread_start, NULL, 1);
if (child[i] == NULL) {
printf("sthread_create %d failed\n", i);
exit(1);
}
}
assert(transfered == 0);
/* This should let the other thread run at some point. */
sthread_mutex_unlock(mutex);
/* Send a bunch of things for the other threads to take */
sent = 0;
while (sent < max_transfer) {
sthread_mutex_lock(mutex);
waiting++;
sent++;
sthread_cond_signal(avail_cond);
sthread_mutex_unlock(mutex);
sthread_yield();
}
printf("Sent %d\n", sent);
/* Now give the other threads 100 tries to get
* them all across. We assume that's enough
* for the sake of not running this test forever. */
checks = 10000; //arbitrary??
while (checks > 0) {
sthread_mutex_lock(mutex);
if (transfered != max_transfer)
checks--;
else {
/* broadcast to let the consumers know we've
* finished, so they can exit
* (othrewise, they may still be holding the lock
* when we try to free it below) */
sthread_cond_broadcast(avail_cond);
checks = -1;
}
sthread_mutex_unlock(mutex);
sthread_yield();
}
if (checks == -1) {
/* Wait for child threads to finish, otherwise we could try to
* free the mutex before they've unlocked it! */
printf("joining on children\n");
for (i = 0; i < num_threads; i++) {
sthread_join(child[i]);
printf("joined with child %d\n", i);
}
printf("sthread_cond passed\n");
} else {
printf("*** sthread_cond failed\n");
/* If we failed, don't bother joining on threads. */
}
sthread_mutex_free(mutex);
sthread_cond_free(avail_cond);
return 0;
}