下面的 thread 变量会不会造成内存泄露呢？因为实际没用到
int_ st_init(void)
{
_st_thread_t *thread;
.............
..................
/*
* Initialize primordial thread
*/
thread = (_st_thread_t *) calloc(1, sizeof(_st_thread_t) + (ST_KEYS_MAX * sizeof(void *)));
if (!thread)
return -1;
thread->private_data = (void **) (thread + 1);
thread->state = _ST_ST_RUNNING;
thread->flags = _ST_FL_PRIMORDIAL;
_ST_SET_CURRENT_THREAD(thread);
_st_active_count++;
#ifdef DEBUG
_ST_ADD_THREADQ(thread);
#endif
return 0;
}