-XBT_PUBLIC int smpi_usleep(useconds_t usecs);
-#if _POSIX_TIMERS > 0
-XBT_PUBLIC int smpi_nanosleep(const struct timespec* tp, struct timespec* t);
-XBT_PUBLIC int smpi_clock_gettime(clockid_t clk_id, struct timespec* tp);
-#endif
-XBT_PUBLIC unsigned int smpi_sleep(unsigned int secs);
-XBT_PUBLIC int smpi_gettimeofday(struct timeval* tv, struct timezone* tz);