int eval(linkedlist *expr, double *val) {
int i;
stack_t stk; /* operator stack */
stack_init(&stk);
for(i = 0; i < linkedlist_size(expr); i++) {
token_t *t = linkedlist_get(expr, i);
token_t *n2, *n1, *res;
/* if number, push to stack: */
if (t->type == TOKEN_NUMBER) {
stack_push(&stk, t);
continue;
}
/* all operators in the postfix expression are binary. */
if (stack_size(&stk) < 2) {
while(!stack_isEmpty(&stk))
free(stack_pop(&stk));
/* free the remaining tokens in expr: */
while(i < linkedlist_size(expr))
free(linkedlist_get(expr, i++));
return -1; /* error. */
}
n2 = stack_pop(&stk);
n1 = stack_pop(&stk);
res = malloc(sizeof(token_t));
res->type = TOKEN_NUMBER;
res->op = 0;
res->num = do_op(n1->num, n2->num, t->op);
stack_push(&stk, res);
free(n2);
free(n1);
free(t);
}
if (stack_size(&stk) != 1) {
while(!stack_isEmpty(&stk)) {
free(stack_pop(&stk));
}
return -1; /* error. */
}
*val = ((token_t *) stack_peek(&stk))->num;
free(stack_pop(&stk));
return 0;
}
static void work(_lazyworker_t* worker)
{
_unit* unit = NULL;
static struct timespec time_wait;
for(;worker->threadStatus == eThreadStatus_RUNNING;)
{
pthread_mutex_lock(&worker->mutex);
for(;;)
{
int que_size = linkedlist_size(worker->sth_todo);
if(que_size > 0)
{
break;
}
pthread_cond_wait(&worker->cond, &worker->mutex);
if(worker->threadStatus == eThreadStatus_CLOSED)
{
pthread_mutex_unlock(&worker->mutex);
pthread_exit((void*) NULL);
}
}
fprintf(stderr, "who wakes me up?");
struct timeval current;
gettimeofday(¤t, NULL);
unit = (_unit*)linkedlist_get(worker->sth_todo, 0);
if(current.tv_sec - unit->t.tv_sec < 1)
{
// Be lazy
time_wait.tv_sec = unit->t.tv_sec + worker->time_wait.tv_sec;
time_wait.tv_nsec = unit->t.tv_usec * 1000 + worker->time_wait.tv_nsec;
fprintf(stderr, "I am too lazy to work, I'll be back in 1 minute. OK?");
pthread_cond_timedwait(&worker->cond, &worker->mutex, &time_wait);
}
else
{
unit = (_unit*)linkedlist_remove_at(worker->sth_todo, 0);
free(unit);
if(worker->fp != NULL)
{
fprintf(stderr, "OK, now I am ready to work, what's on your mind?\n");
worker->fp(worker->args);
}
}
pthread_mutex_unlock(&worker->mutex);
} // for
}
int
LinkedlistExercise(int verbose, struct cfg *cfg, char *args[])
{
int rate, i, n = 0, idx;
char *str;
struct linkedlist *l = linkedlist_new(EXERCISE_MED_COUNT, NULL);
cfg = NULL; args[0] = NULL;
if (l == NULL) {
AMSG("");
return -1;
}
rate = EXERCISE_R0;
for (i = 0; i < EXERCISE_MED_COUNT; i++) {
if (i == EXERCISE_MED_P1) {
rate = EXERCISE_R1;
} else if (i == EXERCISE_MED_P2) {
rate = EXERCISE_R2;
} else if (i == EXERCISE_MED_P3) {
rate = EXERCISE_R3;
}
if (rand() % 10 < rate) {
idx = 0;
str = malloc(8);
sprintf(str, "%07d", n++);
if (rand() % 5) {
idx = linkedlist_size(l);
if (idx) {
idx = rand() % idx;
}
}
if (linkedlist_insert(l, idx, str) == -1) {
PMNO(errno);
return -1;
}
tcase_printf(verbose, "INSERT: %s size now %d\n", str, linkedlist_size(l));
} else {
if (linkedlist_is_empty(l)) {
tcase_printf(verbose, "EMPTY\n");
} else {
idx = rand() % linkedlist_size(l);
str = linkedlist_get(l, idx);
if (linkedlist_remove_data(l, str) == NULL) {
PMNO(errno);
return -1;
}
if ((idx % 10) == 0) {
unsigned int count = 0;
iter_t iter;
linkedlist_iterate(l, &iter);
while (linkedlist_next(l, &iter)) {
count++;
}
if (count != linkedlist_size(l)) {
PMSG("count=%u,linkedlist_size=%u\n", count, linkedlist_size(l));
return -1;
}
}
if (str) {
tcase_printf(verbose, "REMOVE: %s %d\n", str, linkedlist_size(l));
free(str);
} else {
PMSG("remove failure");
return -1;
}
}
}
}
linkedlist_del(l, allocator_free, NULL);
return 0;
}
