int sthread_sem_timedwait(sthread_sem_t* sem, const struct timespec* abs_timeout);
int sthread_gettimeofday(struct timeval* tv);
-void sthread_sleep(double seconds);
+unsigned int sthread_sleep(double seconds);
+int sthread_usleep(double seconds);
int sthread_access_begin(void* objaddr, const char* objname, const char* file, int line, const char* function);
void sthread_access_end(void* objaddr, const char* objname, const char* file, int line, const char* function);