/* 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; }
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; }
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 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 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; }